COMET C3631 External Thermo-Hygrometer

COMET C3631 – Digital thermo-hygrometer with input for external temperature probe, internal humidity 5–95 %RH (±2.5 %), temperature -50 to +250 °C, dew point 

The COMET C3631 is a professional digital thermo-hygrometer with an external temperature probe and an integrated humidity sensor – the ideal solution for precise monitoring of ambient climate and process temperature in warehouses, climate chambers, cold chains, server rooms, pharmaceutical facilities, food production, heating and cooling technology, or any application where humidity is measured internally and temperature externally with flexibility. With a wide measuring range, very high accuracy, and a traceable calibration certificate, it serves perfectly as a reference or test instrument for demanding applications.

The internal humidity sensor measures 5 to 95 %RH (±2.5 %RH) and calculates the dew point (-40 to +60 °C). The external temperature probe (Ni1000/Pt1000 – NOT INCLUDED) extends the range to -50 to +250 °C with high accuracy (±0.2 °C from -50 to +100 °C). The acoustic and optical alarm gives immediate warning when freely adjustable limits are exceeded. The Min/Max memory stores extreme values since the last power-on. The backlit LCD is easy to read, and both measuring interval and display update can be adjusted. The robust housing (IP20) and battery power (9 V block or 12 V power supply with NiMH battery) make it suitable for mobile and independent use – battery life approx. 4–6 months.

The device is maintenance-free, long-term stable, and comes with a 3-year warranty. The supplied traceable calibration certificate guarantees maximum accuracy from the factory. Intuitive operation via keys and a clear menu. Whether used as a portable device in the field, a climate monitor in production, or a reference in the lab – the C3631 stands out for precision, flexibility, and ease of use.

Why the COMET C3631 is the best thermo-hygrometer with external probe:

• Internal humidity + external temperature – maximum flexibility
• High accuracy – Temp. ±0.2 °C | Humidity ±2.5 %RH
• Dew point calculation – ±1.5 °C at T<25 °C and RH>30 %
• Audible and visual alarm – immediate warning when limits are exceeded
• Min/Max memory – extreme values since last reset
• Backlit LCD – easily readable even in low light conditions
• Traceable calibration certificate included – maximum traceability
• Mobile battery operation – approx. 4–6 months lifetime (9 V block or NiMH battery)
• Rugged housing – for daily professional use
• 3-year warranty – guaranteed COMET quality

Technical data C3631:

• Humidity (internal): 5 to 95 %RH (±2.5 %RH at 23 °C)
• Temperature (external Ni1000/Pt1000): -50 to +250 °C (±0.2 °C from -50 to +100 °C / ±0.2 % above)
• Dew point: -40 to +60 °C (±1.5 °C at T<25 °C and RH>30 %)
• Resolution: 0.1 °C / 0.1 %RH / 0.1 °C dew point
• Alarm: audible + visual (adjustable limits)
• Min/Max memory: yes, with reset function
• Display: backlit LCD
• Measuring interval / display update: 0.7 to 5 s
• Power supply: 9 V battery or 12 V DC adapter with NiMH 9 V battery
• Battery life: approx. 4–6 months
• Operating temperature: -10 to +60 °C
• Protection class: IP20
• Dimensions (without connector): 191 x 71 x 27 mm
• Weight (including battery): approx. 155 g
• Warranty: 3 years

Perfect for:

• Indoor climate monitoring in offices and warehouses
• Climate chambers and incubators
• Cold chain and pharmaceutical storage
• Heating and cooling technology
• Process monitoring and quality control
• Mobile temperature and humidity measurements in the field
• Museums, archives, and sensitive storage areas
• Reference measurements and documentation

Installation and operation – ready to use immediately

Connect the Ni1000 probe (not included), insert the battery or connect the power adapter – done! Set limit values, reset Min/Max – start measuring immediately. The backlit display and audible alarm ensure safe and convenient operation. Calibration certificate included – ideal for audits and quality management.

Summary:

• COMET C3631 – digital thermo-hygrometer with external temperature probe, internal humidity 5–95 %RH (±2.5 %), temperature -50 to +250 °C, dew point

Scope of delivery:

• C3631
• User manual
• Traceable calibration certificate
• 9 V battery
• Plastic transport case
• External Ni1000 temperature probe not included (to be ordered separately)