Older CEL Instruments

Non Current CEL Instruments

Model number & name	Picture of instrument	Brief description of instrument and key features	Closest current CEL model
CEL-160 Graphic level recorder		Unique design of high speed graphic level recorder with built in precision sound level meter circuit to accept input from standard CEL type 1 microphones and preamplifiers. Standard sound meter dynamics for writing speed using spark discharge system across 50 mm wide metalized paper roll. Paper speeds from 0.001 to 30 mm per sec. Log and linear recording range. Built in Leq option. Built in event recording above preset threshold level. Building acoustics firmware for use with suitable CEL 1/3 octave filter sets and pink noise generators.	CEL-593.A1
CEL-162 Environmental noise analyzer		Weatherproof long term noise analyzer with 90 dB dynamic measurement range covering 25 to 145 dB in 2 ranges. Cumulative and period results for Leq, max and 5 x LN% values. Built in impact printer for data output. Versions with event triggering to control audio tape recorders. No memory.	CEL-490.A1
CEL-175 Type 1 Integrating sound level meter		A precision hand held integrating sound level meter with analog (needle) display of noise levels. 40 dB dynamic range with Leq and Max hold features. Takes external plug on filter sets for optional frequency analysis. Analog outputs for tape recorders or level recorders.	CEL-450.A1
CEL-177 Acoustic calibrator		A single frequency, single level calibrator used for checking the sensitivity of CEL and other sound level meters on a day to day basis in the field. Operates at a nominal level of 114.0 dB and a frequency of 1 kHz. Has a continuous output and a timed output for calibrating certain noise dosimeters. Also provided with an electrical output that can be used to calibrate a sound level meter when fitted with an optional vibration attachment kit for simple machinery vibration measurements.	CEL-110/1
CEL-178 Octave band filter set		External plug on filter set for CEL-175, 187 and 193 sound level meters. Has broadband Lin and A weighting plus 10 octave filters from 31.5Hz to 16kHz. Manual operation for filter switching. Runs from 2 9 V batteries.	CEL-450.B1
CEL-180 Type 1 Noise dosimeter		A noise dosimeter with a single measurement range from 80 to 140 dB, Q=5 exchange rate pre-configured for OSHA measurements. Fitted with a 1/2 in precision microphone for ANSI Type 1 accuracy operation. No logging capability nor direct printing.	CEL-320
CEL-181 Type 2 Noise dosimeter		A noise dosimeter with a single measurement range from 80 to 140 dB, Q=5 exchange rate pre-configured for OSHA measurements. Fitted with a 1/2 in general purpose microphone for ANSI Type 2 accuracy operation. No logging capability nor direct printing.	CEL-320
CEL-182 Dosimeter calibrator		A single frequency, single level calibrator. 1 kHz at 116.5 dB. Single push button switch for control for a fixed time interval of 65 seconds. High level and fixed time produce a suitable level for calibrating personal noise dosimeters set to read 100% dose at a level of 90 dB for 8 hours. Powered from 9 V battery.	CEL-110/2
CEL-183 Type 2 integrating meter		Analog sound level meter with limited 40 dB dynamic range. 50 to 130 dB total in 3 overlapping ranges. Leq, max and sound level displays. Analog ac output to tape recorders. Powered from 2 off 9 V batteries.	CEL-320S
CEL-184 Acoustic calibrator		A single frequency, single level calibrator. 1 kHz at 90 dB. Single on off slide switch for control. Powered from 9 V battery.	CEL-110-2
CEL-193 Type 1 Integrating Impulse sound level meter		A hand held integrating sound level meter with analog (needle) display of noise levels. 60 dB dynamic range with Leq, LAx and Max features. Pause control to delete unwanted sounds from results. Takes external plug on filter sets CEL-178 or 196 for optional frequency analysis. Analog outputs for tape recorders or level recorders. Remotely mountable microphone and preamplifier using extension cables. Tripod socket for extended measurements.	CEL-450.A1
CEL-196 Third octave band filter set		External plug on filter set for CEL-175, 187 and 193 sound level meters. Has broadband Lin and A weighting plus 31 third octave filters from 20Hz to 20kHz. Has automatic sweep mode when controlled by suitable level recorders.	CEL-450.C1
CEL-206 Disco noise level limiter		A wall mounted type 2 sound measurement system using remote microphone to measure the noise at the stage area and display the levels at the control desk. Switching in the unit will attenuate the input signals of up to 4 line sources to reduce the noise level by a fixed 20 dB while still maintaining the continuity of the performance. Also equipped with mains power cutoff controls for persistent offenders who will not heed the previous warnings. Measurement range from 70 to 120 dB with Slow or Fast time weightings and threshold settable in 1 dB steps across the range. Can be linked to "traffic light" style warning display and can control up to 10 separate input sources.
CEL-210 Type 3 Sound level indicator		A simple sound level indicator with a limited 80 to 120 dB fixed single measurement range, A frequency weighting only, Slow time weighting only, On/Off and battery check control. Analog (needle) display of instantaneous sound level in 1 dB increments.	CEL-231
CEL-213 Random noise generator		A portable wide band noise source providing both white and pink noise signals as an electrical output to amplifiers. Used for building acoustic testing or producing background masking noise in waiting rooms to ensure privacy in sensitive areas such as doctor's surgeries. Noise signal up to 100 kHz with variable control to match requirements of following amplifier. External switching from suitable CEL meters to turn on or off acoustic noise to measure room decay times and reverberation measurements.	CEL-513
CEL-214 Type 2 Sound level meter		Type 2 analog (needle) display showing 40 dB dynamic range in 1 dB increments. 3 measurement ranges from 30 to 130 dB, A and Lin frequency weightings, Slow/Fast/Impulse time weightings. Shows instantaneous level and maximum hold of highest level. Battery check in On/Off switch with wrist strap and tripod socket.	CEL-254
CEL-224 Type 2 Sound level meter		Type 2 analog (needle) display showing 40 dB dynamic range in 1 dB increments. 3 measurement ranges from 30 to 130 dB, A frequency weighting, Slow/Fast time weightings. Shows instantaneous level. Battery check in On/Off switch with wrist strap and tripod socket.	CEL-231
CEL-228 Type 2 Octave band sound level meter		Type 2 analog (needle) display showing 40 dB dynamic range in 1 dB increments. 3 measurement ranges from 30 to 130 dB, A and Lin frequency weightings, Slow/Fast/Impulse time weightings. Shows instantaneous level and maximum hold of highest level. Built in set of 8 octave band filters from 63 to 8kHz plus a low pass and a high pass band. Battery check in On/Off switch with wrist strap and tripod socket.	CEL-450.B2
CEl-231 Digital sound level meter		Basic ANSI/IEC type 2 sound level meter with Fast/Slow response with A frequency weighting. 2 measurement ranges from 30 to 135 dB. Measures sound level only so suitable for simple steady noise levels only.	CEL-240
CEL-238 Secondary processor and printer		Printer and storage device for use with CEL-275, 383, 493 sound level meters fitted with optional digital interface. Uses 100 mm wide thermal paper rolls for text and graphic printout of measured noise levels from sound level meter. Uses program card specific to each instrument and application.	CEL-450.A
CEL-254 Impulse sound level meter		Simple ANSI/IEC type 2 sound level meter with same features as CEL-231 plus, C frequency weighting and Impulse time response. Measures instantaneous sound level and has maximum hold feature for capturing highest noise level.	CEL-240
CEL-262 Environmental noise analyzer		Weatherproof long term noise analyzer with 90 dB dynamic measurement range covering 25 to 145 dB in 2 ranges. Cumulative and period results for Leq, max and 5 x LN% values. User selectable LN% values. Built in quiet spark printer for data output. Versions with event triggering to control audio tape recorders. Non volatile memory available as option with data recorder in lid. CEL software for download and reporting.	CEL-490.A1
CEL-266 Type 1 Octave band sound level meter		Type 1 digital display showing 60 dB dynamic range in 0.1 dB increments. 3 measurement ranges from 20 to 140 dB, A and Lin (or C) frequency weightings, Slow/Fast/Impulse/Peak time weightings. Shows instantaneous level and maximum hold of highest level. Built in set of 10 octave band filters from 31.5 to 16kHz with Leq measurement in each band. Quasi-analog bar graph display of instantaneous level in 1 dB steps. Battery check in On/Off switch with tripod socket.	CEL-450.B1
CEL-268 Type 1 Logging sound level meter		A broadband sound level meter, ANSI type 1, with Leq, max and 4 statistical LN% values for a wide range of industrial or environmental data logging applications. 3 measurement ranges from 20 to 140 dB in 70 dB spans. 'A' and 'C' frequency weighting with Slow, Fast and Impulse time weightings. Selectable Q exchange rate for use in US workplace noise monitoring. Storage of up to 60,000 results spread over 4 separate runs. Direct output to printer or download to PC software for further calculations or archiving.	CEL-490.A1
CEL-269 Type 2 Integrating sound level meter		Slim lightweight type 2 sound level meter featuring 2 measurement ranges each covering 70 dB. Total measurement range from 30 to 135 dB with A and C frequency weighting, Slow/Fast/Impulse time weightings. Measures and displays instantaneous level plus maximum and time average Leq with user reset control. AC output to tape recorder or other device. No tripod socket or wrist strap. Non logging and non printing.	CEL-244
CEL-272 Personal sound exposure meter		A simple noise dosimeter designed to satisfy the ISO 1999 standard using Q = 3 measurement protocol. Measures Pa²h or noise dose% based on criterion level of 90 dB. Single measurement range of 70 to 140 dB.	CEL-320
CEL-275 Type 1 Integrating sound level meter		Type 1 digital display showing 60 dB dynamic range in 0.1 dB increments. 3 measurement ranges from 20 to 140 dB, A and Lin (or C) frequency weightings, Slow/Fast/Impulse/Peak time weightings. Shows instantaneous level and maximum hold of highest level. Also shows the time average level Leq over the measurement interval. Quasi-analog bar graph display of instantaneous level in 1 dB steps. Optional digital output to CEL secondary processors. Battery check in On/Off switch with tripod socket.	CEL-450.A1
CEL-278 Automatic octave band filter set		A whole octave filter set that matches the CEL-275, 383, 493 range of sound level meters. Fitted with a 30 dB gain switch for measurements of low level signals. Broadband A and C weighting network built in to obtain overall level. Can be controlled by CEL-160 graphic level recorder and CEL-238, 338, 438 digital printers. Octave center frequencies from 16 to 16kHz in 11 steps.	CEL-450.B1
CEL-281 Logging noise dosimeter		A logging noise dosimeter with a single measurement range from 70 to 140 dB. Possible to select the exchange rate Q from 3, 4, 5 or 6 dB. Both 'A' and 'C' frequency weightings are provided with Slow, fast and Impulse time weightings. 20,000 point memory stores 1 sec, 10, sec, 1 min and 10 min profiles for later download or printing. Unique slide on keypad, CEL-6012, is removable for added security during measurement run. Use with PC software CEL-6171 (DOS) package only.	CEL-360
CEL-282 Class 2 Acoustic calibrator		Single level 114 dB ± 0.5 dB at single frequency 1 kHz ± 5 Hz acoustic calibrator with direct fitting to 1/2" microphones and with 1/4" capsules with adaptor provided as standard. Less than ± 0.5 % harmonic distortion.	CEL-110/2
CEL-283 Type 2 Integrating sound level meter		Type 2 analog (needle) display showing 40 dB dynamic range in 1 dB increments. 3 measurement ranges from 30 to 130 dB, A and Lin frequency weightings, Slow/Fast/Impulse time weightings. Shows instantaneous level and maximum hold of highest level. Also shows the time average level Leq over the measurement interval. Battery check in On/Off switch with wrist strap and tripod socket.	CEL-430.A2
CEL-284 Class 1 Acoustic calibrator		Single level 114 dB ± 0.3 dB at single frequency 1 kHz ± 5 Hz acoustic calibrator with direct fitting to 1/2" microphones and with 1/4" capsules with adaptor provided as standard. Less than ± 0.5 % harmonic distortion. Provided with 100 mV sine wave output at 1 kHz for electrical check of complete measurement systems.	CEL-110/1
CEL-296 Automatic third octave band filter set		A whole octave and third octave filter set that matches the CEL-275, 383, 493 range of sound level meters. Fitted with a 30 dB gain switch for measurements of low level signals. Broadband Lin weighting network built in to obtain overall level. Can be controlled by CEL-160 graphic level recorder and CEL-238, 338, 438 digital printers. Octave center frequencies from 16 to 16kHz in 11 steps. Third octave center frequencies from 6.3 to 20kHz. Auto scan and storage of up to 6 scans in memory. Recall of stored levels to display or printer, recorder.	CEL-450.C1
CEL-310 Noise Badge Dosimeter		A personal noise dosimeter with built in microphone so there are no cables to get caught up with worker's clothing. Measured ISO or OSHA noise protocols but not at the same time. Data logging LAeq value at 1 min intervals to show time history.	CEL-350
CEL-313 Random noise generator		A portable wide band noise source providing pink noise signals as an electrical output to amplifiers. Used for building acoustic testing or producing background masking noise in waiting rooms to ensure privacy in sensitive areas such as doctor's surgeries. Noise signal up to 100 kHz with variable control to match requirements of following amplifier. External switching from suitable CEL meters to turn on or off acoustic noise to measure room decay times and reverberation measurements.	CEL-513
CEL-314 Type 1 Sound level meter		Type 1 analog (needle) display showing 40 dB dynamic range in 1 dB increments. 7 measurement ranges from 30 to 130 dB, A and Lin frequency weightings, Slow/Fast/Impulse time weightings. Shows instantaneous level and maximum hold of highest level. Battery check in On/Off switch with wrist strap and tripod socket.	CEL-430.A1
CEL-315 Reader and Calibrator		Dedicated reader and calibrator for CEL-310 Dosebadges to calibrate, setup, start, stop and download results. Provides the memory for multiple Dosebadges in a kit then transfer to pc software package for reporting.	CEL-110/2
CEL-328 Type 2 Integrating Octave band sound level meter		Type 2 digital display showing 60 dB dynamic range in 0.1 dB increments. 3 measurement ranges from 20 to 140 dB, A and Lin (or C) frequency weightings, Slow/Fast/Impulse/Peak time weightings. Shows instantaneous level and maximum hold of highest level. Built in set of 10 octave band filters from 31.5 to 16kHz with Leq measurement in each band. Quasi-analog bar graph display of instantaneous level in 1 dB steps. Battery check in On/Off switch with tripod socket.	CEL-450.B2
CEL-338 Secondary processor and printer		Printer and storage device for use with CEL-275, 383, 493 sound level meters fitted with optional digital interface. Uses 100 mm wide thermal paper rolls for text and graphic printout of measured noise levels from sound level meter. Uses program card specific to each instrument and application.
CEL-368 Type 2 Logging sound level meter		A broadband sound level meter, ANSI type 2, with Leq, max and 4 statistical LN% values for a wide range of industrial or environmental data logging applications. 3 measurement ranges from 20 to 140 dB in 70 dB spans. 'A' and 'C' frequency weighting with Slow, Fast and Impulse time weightings. Selectable Q exchange rate for use in US workplace noise monitoring. Storage of up to 60,000 results spread over 4 separate runs. Direct output to printer or download to PC software for further calculations or archiving.	CEL-490.A2
CEL-383 Type 2 Integrating sound level meter		Type 2 digital display showing 60 dB dynamic range in 0.1 dB increments. 3 measurement ranges from 20 to 140 dB, A and Lin (or C) frequency weightings, Slow/Fast/Impulse/Peak time weightings. Shows instantaneous level and maximum hold of highest level. Also shows the time average level Leq over the measurement interval. Quasi-analog bar graph display of instantaneous level in 1 dB steps. Optional digital output to CEL secondary processors. Battery check in On/Off switch with tripod socket.	CEL-450.A2
CEL-393 Type 1 Computing Sound level meter		A combined integrating precision sound level meter and automatic third octave band analyzer in a single lightweight hand held instrument. Features A and Lin broadband frequency weightings plus octave and third octave band filters covering the range from 6.3 Hz to 20kHz. Slow/Fast/Impulse/Peak time weightings with 60 dB dynamic range measurements from 20 to 140 dB in 10 dB step intervals. Measures Leq, max, L10%, L50%, L90% and SEL. Built in calendar clock sets real time into unit which can then be used to control data acquisition in fully 1 of 4 automatic modes. Profile data logging of just Leq for short intervals 1 to 4 minutes. Environmental data logging of all parameters from intervals from 5 to 999 minutes. Event logging of noise levels above user set threshold level with tape recorder activation if required. Automatic scanning of octaves or third octave bands for reliable and accurate frequency analysis of noise or vibration signals. Data storage in volatile memory for later printing or transfer to computer.	CEL-490.C1
CEL-414 Type 1 Sound level meter		Type 1 digital display showing 60 dB dynamic range in 0.1 dB increments. 3 measurement ranges from 20 to 140 dB, A and Lin (or C) frequency weightings, Slow/Fast/Impulse/Peak time weightings. Shows instantaneous level and maximum hold of highest level. Quasi-analog bar graph display of instantaneous level in 1 dB steps. Analog outputs to CEL chart recorders or audio tape recorders. . Battery check in On/Off switch with tripod socket.	CEL-450.A1
CEL-420 Noise dosimeter		Personal noise dosimeter with two 70 dB measurement ranges covering levels from 50 to 140 dB. A and C weightings, Slow, Fast and Impulse time weightings. 4 preprogrammed setups ready for immediate measurement, OSHA, DoD, ISO85 and ISO90 configurations. 3 user programmable setups using optional CEL software. 2 thresholds and 1 criterion level available to suit requirements. Up to 16 runs stored with max, Leq, Lavg, dose%, projected dose%, 8 hour TWA calculated. Direct printout to standard office printer. Fitted with cable microphone for personal monitoring.	CEL-320
CEL-422 IS Noise dosimeter		Personal noise dosimeter with two 70 dB measurement ranges covering levels from 50 to 140 dB. A and C weightings, Slow, Fast and Impulse time weightings. 4 preprogrammed setups ready for immediate measurement, OSHA, DoD, ISO85 and ISO90 configurations. 3 user programmable setups using optional CEL software. 2 thresholds and 1 criterion level available to suit requirements. Up to 16 runs stored with max, Leq, Lavg, dose%, projected dose%, 8 hour TWA calculated. Direct printout to standard office printer. Fitted with cable microphone for personal monitoring. For use in hazardous areas.	CEL-320IS
CEL-424 Type 2 Sound level meter		Convertible sound level meter with two 70 dB measurement ranges covering levels from 50 to 140 dB. A and C weightings, Slow, Fast and Impulse time weightings. Up to 16 runs stored with max, Leq, Lavg, calculated. Direct printout to standard office printer. Fitted with stalk microphone for hand held monitoring. Can be converted into a CEL-420 dosimeter by exchanging stalk microphone for cable unit.	CEL-320S
CEL-426 IS Type 2  Sound level meter		Convertible sound level meter with two 70 dB measurement ranges covering levels from 50 to 140 dB. A and C weightings, Slow, Fast and Impulse time weightings. Up to 16 runs stored with max, Leq, Lavg, calculated. Direct printout to standard office printer. Fitted with stalk microphone for hand held monitoring. Can be converted into a CEL-420 dosimeter by exchanging stalk microphone for cable unit. For use in hazardous areas.	CEL-320IS
CEL-460 Logging noise dosimeter		Personal noise dosimeter with three 70 dB measurement ranges covering levels from 30 to 140 dB. A and C weightings, Slow, Fast and Impulse time weightings. 4 preprogrammed setups ready for immediate measurement, OSHA, DoD, ISO85 and ISO90 configurations. 3 user programmable setups using optional CEL software. 2 thresholds and 1 criterion level available to suit requirements. Up to 16 runs stored with max, Leq, Lavg, dose%, projected dose%, 8 hour TWA calculated. 5 statistical exceedance levels stored during run with user selectable values. 1 or 2 noise parameters can be logged at regular intervals from 1 second to 1 hour to store the changing noise levels during the runs. After download the user is able to see the time history to understand what happened during a run. Direct printout to standard office printer. Fitted with cable microphone for personal monitoring.	CEL-360
CEL-462 IS Logging noise dosimeter		Personal noise dosimeter with three 70 dB measurement ranges covering levels from 30 to 140 dB. A and C weightings, Slow, Fast and Impulse time weightings. 4 preprogrammed setups ready for immediate measurement, OSHA, DoD, ISO85 and ISO90 configurations. 3 user programmable setups using optional CEL software. 2 thresholds and 1 criterion level available to suit requirements. Up to 16 runs stored with max, Leq, Lavg, dose%, projected dose%, 8 hour TWA calculated. 5 statistical exceedance levels stored during run with user selectable values. 1 or 2 noise parameters can be logged at regular intervals from 1 second to 1 hour to store the changing noise levels during the runs. After download the user is able to see the time history to understand what happened during a run. Direct printout to standard office printer. Fitted with cable microphone for personal monitoring. For use in hazardous areas.	CEL-360IS
CEL-464 Type 2 Logging sound level meter		Convertible sound level meter with three 70 dB measurement ranges covering levels from 30 to 140 dB. A and C weightings, Slow, Fast and Impulse time weightings. Up to 16 runs stored with max, Leq, Lavg, calculated. 5 statistical excedance levels stored during run with user selectable values. 1 or 2 noise parameters can be logged at regular intervals from 1 second to 1 hour to store the changing noise levels during the runs. After download the user is able to see the time history to understand what happened during a run. Direct printout to standard office printer. Fitted with stalk microphone for hand held monitoring. Can be converted into a CEL-460 dosimeter by exchanging stalk microphone for cable unit.	CEL-360
CEL-466 IS Type 2 Logging sound level meter		Convertible sound level meter with three 70 dB measurement ranges covering levels from 30 to 140 dB. A and C weightings, Slow, Fast and Impulse time weightings. Up to 16 runs stored with max, Leq, Lavg, calculated. 5 statistical excedance levels stored during run with user selectable values. 1 or 2 noise parameters can be logged at regular intervals from 1 second to 1 hour to store the changing noise levels during the runs. After download the user is able to see the time history to understand what happened during a run. Direct printout to standard office printer. Fitted with stalk microphone for hand held monitoring. Can be converted into a CEL-460 dosimeter by exchanging stalk microphone for cable unit. For use in hazardous areas.	CEL-360IS
CEL-438 Dual channel Secondary processor and printer		Two channel printer and storage device for use with CEL-275, 383, 493 sound level meters fitted with optional digital interface. Uses 100 mm wide thermal paper rolls for text and graphic printout of measured noise levels from sound level meter. Uses program card specific to each instrument and application.
CEL-440 Type 1 & 2 Sound level meter		Available in both ANSI Type 2 and Type 1 versions using different microphones. Three versions offered with broadband only (A model), plus octaves (B model) and third octaves (C model). Slow, Fast and Imp responses, A, C and Z frequency weighting. Exchange rate Q=3 plus 4, 5 or 6. User selectable dB threshold for OSHA measurements of TWA. Data storage for up to 999 runs, download to pc, direct printing, 4 user setups, 70 dB dynamic range. Manual data recording by user on site. No timers or data logging at regular intervals. Freq range from 25 Hz to 12.5 kHz.	CEL-450
CEL-480 Type 1 & 2  Logging sound level meter		Available in both ANSI Type 2 and Type 1 versions using different microphones. Three versions offered with broadband only (A model), plus octaves (B model) and third octaves (C model). Slow, Fast and Imp responses, A, C and Z frequency weighting. Exchange rate Q=3 plus 4, 5 or 6. User selectable dB threshold for OSHA measurements of TWA. Data storage for up to 999 runs, download to pc, direct printing, 4 user setups, 70 dB dynamic range. Manual data recording, automatic data logging user timers, delay start and stop using real time clock. Up to 9999 points of data logging at regular intervals 1 sec to 1 hour. Freq range from 25 Hz to 12.5 kHz. Data logging in a selected band if required.	CEL-490
CEL-493 Type 1 Integrating Impulse sound level meter		Type 1 digital display showing 100 dB dynamic range in 0.1 dB increments. 3 measurement ranges from 10 to 150 dB, A and Lin frequency weightings, Slow/Fast/Impulse/Peak time weightings. Shows instantaneous level and maximum hold of highest level. Also shows the time average level Leq over the measurement interval. Fitted with dB threshold level detection circuit settable in 1 dB steps to switch audio tape recorder. Quasi-analog bar graph display of instantaneous level in 1 dB steps. Standard digital output to CEL secondary processors. Battery check in On/Off switch with wrist strap and tripod socket.	CEL-490.A1
CEL-553 Type 1 real time analyzer		Type 1 (or type 2) real time analyzer with available options for real time sound surveys in third octave bands. Options to add Fastore rapid data capture or Loudness option for Sone and Phon measurements for sound quality measurements.	CEL-620.C1
CEL-573 Type 1 real time logging  analyzer		All the features of the CEL-553 plus a data logging mode using the real time clock to collect samples at regular intervals. Especially useful for environmental surveys to collect time history information at a single location. Could accept all the options in the CEL5X3 series such as Fastore, Building Acoustics and Sound Quality.	CEL-490.C1
CEL-593 Type 1 real time logging and event analyzer		All the features of the CEL-573 plus an event data logging mode using a triggered setting to collect noise levels that are above the set point. This was in addition to collecting the samples at regular intervals. Especially useful for environmental and transient event surveys to collect time history information at a single location of sources such as aircraft flyovers or train pass bys. Could accept all the options in the CEL5X3 series such as Fastore, Building Acoustics and Sound Quality.	CEL-490.C1

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