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Carbon Dioxide, Temperature and Humidity Meter (COH-9905SD) Data-Logging

Name: Carbon Dioxide, Temperature and Humidity Meter (COH-9905SD) Data-Logging
Brand: Lutron Instruments
SKU: 2141
Price: 396.00 USD
Availability: InStock
Rating: 5.00 (111 reviews)

Model #: COH-9905SD

UPC: 00810106420790

Condition: New

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Carbon Dioxide, Temperature and Humidity Meter (COH-9905SD) Data-Logging

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List Price: ~~$499.95~~ $396.00

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Product 10 of 13

Category: Air Quality

Carbon Dioxide, Temperature and Humidity Data-Logging Meter. Environmental Conditions Meter. Model COH-9905SD

The Lutron COH-9905SD is an air quality instrument that measures carbon dioxide (CO2), humidity and temperature, and calculates dew point and wet bulb temperature from those readings. CO2 is measured by the NDIR method over a wide 0 to 10,000 ppm range, and humidity uses a precision capacitance sensor. A built-in SD memory card data logger records every channel to a single Excel file along with time information, so no additional software is required for analysis. The meter includes an adjustable CO2 alarm with beeper output and ships in a hard carrying case. Patented.

Real time recorder saves data to an SD memory card for direct download into Excel; no extra software is required for data or graphic analysis.
Records both probes' data (humidity, CO2 and temperature) with time information into one Excel file simultaneously.
Manual data logger allows a different location number to be set for each saved reading (position 1 to 99).
Multi-function air quality measurement: CO2, humidity and temperature.
CO2 range 0 to 10,000 ppm with 1 ppm resolution.
Dew point and wet bulb temperature measurement.
NDIR CO2 sensor for stable long-term operation.
Precision capacitance humidity sensor.
Alarm setting with beeper sound output.
Sampling time for the data recorder is settable from 2 to 3,600 seconds.
Large LCD with green back light and four-step brightness adjustment.
Data hold function freezes the display reading.
Records maximum and minimum readings with recall.
RS-232/USB computer interface.
Powered by batteries or an optional DC 9V adapter.
Tripod fixing nut and built-in stand for hands-free placement.

Specifications

Circuit	Custom one-chip microprocessor LSI circuit.
Display	LCD, 52 mm x 38 mm, with green back light (on/off, four brightness steps).
Measurement	CO2 (carbon dioxide), humidity, temperature, dew point temperature, wet bulb temperature.
Sensor structure	CO2: NDIR (non-dispersive infrared) sensor.
	Humidity: precision capacitance sensor.
	Temperature: precision thermistor.
Alarm setting	Adjustable alarm value with beeper sound output.
Data hold	Freezes the display reading.
Memory recall	Maximum and minimum values.
Display sampling time	Approximately 1 second.
Data output	RS-232/USB PC computer interface. The optional UPCB-02 cable provides the RS-232 plug; the optional USB-01 cable provides the USB plug.
Operating temperature	0 to 50 °C (32 to 122 °F)
Operating humidity	Less than 80% RH
Power supply	Alkaline or heavy duty DC 1.5V battery (UM3, AA) x 6 pcs, or equivalent. DC 9V adapter input (adapter optional).
Power current	CO2 measurement, without SD card saving and back light off: approximately DC 65 mA. SD card saving adds approximately 42.5 mA. Back light on adds approximately 10 mA.

Data Recording

Data logger sampling time	Auto: 2, 5, 10, 30, 60, 120, 300, 600, 1800 or 3600 seconds.
Data logger sampling time	Manual: pressing the data logger button once saves one reading. Set the sampling time to 0 seconds. Manual mode can also select position (location) number 1 to 99.
Data error rate	0.1% of total saved data, maximum.
Memory card	SD memory card, 2 GB to 16 GB. Card is optional.
Advanced settings	SD memory card format; set clock time; set sampling time; auto power off management; beep sound on/off; decimal point of SD card setting; temperature unit setting; alarm value setting; altitude value setting.

Saved data downloads directly into Excel for further data and graphic analysis; no extra software is required.

Electrical Specifications

Specifications apply at 23 ± 5 °C.

CO2 (Carbon Dioxide)

Range	0 to 10,000 ppm
Resolution	1 ppm
Accuracy	± 40 ppm at 1,000 ppm and below.
	± (50 ppm + 3% of reading) above 1,000 ppm through 3,000 ppm.
	± (50 ppm + 5% of reading) typical above 3,000 ppm through 10,000 ppm.
Repeatability	± 20 ppm at 3,000 ppm and below.

Humidity

Range	5% to 95% RH
Resolution	0.1% RH
Accuracy	± (3% of reading + 1% RH) at 70% RH and above.
Accuracy	± 3% RH below 70% RH.

Temperature

Range	0 to 50 °C, 32 to 122 °F
Resolution	0.1 degree
Accuracy	± 0.8 °C, ± 1.5 °F

Dew Point Temperature

Unit	Range	Resolution
°C	-25.3 to 48.9 °C	0.1 °C
°F	-13.5 to 120.1 °F	0.1 °F

Wet Bulb Temperature

Unit	Range	Resolution
°C	-21.6 to 50.0 °C	0.1 °C
°F	-6.9 to 122.0 °F	0.1 °F

Dew point and wet bulb values are calculated automatically from the humidity and temperature measurements. Their accuracy is the sum of the humidity and temperature measurement accuracies.

Specifications are tested in an environment with RF field strength less than 3 V/m and frequency less than 30 MHz.

Dimensions

Meter	177 x 68 x 45 mm (7.0 x 2.7 x 1.8")

Weight

Meter	350 g (0.77 lb)

Accessories Included

Instruction manual, 1 pc.
Hard carrying case, 1 pc.

Downloads

Link to the technical data sheet that is provided by the manufacturer

Download Users Manual (PDF format). Revised 9/2026.

Lutron Certificate of Calibration Lutron Instruments & Solutions arrive brand new from Lutron with this factory calibration certificate enclosed. Until our chain of custody is broken we are certain and guaranty that every meter meets this standard at the time of shipment. InspectUSA would need to ship the new meter directly to your NIST lab, with our guaranty that it would meet NIST standards. We must ship the instrument direct to an approved NIST lab for this guaranty to be applicable. Once the chain of custody is broken for whatever reason, this guaranty is no longer valid.

ISO-9001 Certification

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Product 10 of 13

Category: Air Quality