COMET D4141 – Thermo-Hygro-Barometer with Data Logger & External Temperature and Humidity Probe

COMET D4141 – Digital Thermo-Hygro-Barometer with Data Logger & External T+RH Probe, Internal Temp. -10 to +60 °C, Air Pressure 800–1100 hPa, Dew Point 

The COMET D4141 is a professional digital thermo-hygro-barometer with an integrated data logger and external temperature-humidity probe (Ø 18 mm, length 135 mm) – the ideal solution for long-term monitoring and documentation of ambient climate and process temperature in warehouses, climate chambers, cold rooms, server rooms, museums, archives, greenhouses, the pharmaceutical industry, or anywhere humidity and air pressure must be measured internally and temperature/humidity externally in hard-to-reach places. With a memory capacity of 16,000 readings (non-cyclic or cyclic), freely adjustable recording interval (10 s to 24 h), and a traceable calibration certificate, it is perfect for quality management, audits, and long-term environmental monitoring.

The internal temperature sensor measures -10 to +60 °C (±0.4 °C), and the barometric pressure sensor measures 800 to 1100 hPa (±2 hPa at 23 °C), including a 3-hour trend indication. The external combined probe measures temperature from -30 to +105 °C (±0.4 °C) and humidity from 5 to 100 %RH (±2.5 %RH from 5 to 95 % at 23 °C). The dew point is automatically calculated (-50 to +80 °C, ±1.5 °C at T<25 °C and RH>30 %). The acoustic and optical alarm immediately alerts when user-defined limits are exceeded. The Min/Max memory shows extreme values, and the Hold function allows manual storage of current readings for later display. The backlit LCD display is easy to read, and both measuring rate (0.7 to 5 s) and display update rate are adjustable. The robust housing (IP20) and battery power supply (9 V battery or 12 V adapter with NiMH battery) make it mobile and independent of the mains – battery life approx. 6 months.

The free PC software enables simple data transfer via USB cable (for download only; no measurement during connection). Data can be displayed graphically, exported, and analyzed. The device is maintenance-free, long-term stable, and comes with a 3-year warranty. The included traceable calibration certificate ensures maximum accuracy from the factory. Intuitive operation via buttons and a clear menu. Whether used as a portable logger in the field, as a permanent climate monitor in production, or as a laboratory reference instrument – the D4141 stands out for its precision, flexibility, and ease of use.

Why the COMET D4141 is the best thermo-hygro-barometer with external probe and logger:

• 16,000 data memory – cyclic or non-cyclic
• Recording interval freely adjustable – 10 s to 24 h
• External T+RH probe (1 m cable, Ø 18 mm, L 135 mm) – flexible measurement
• Complete 4-in-1: Temperature + Humidity + Dew Point + Air Pressure
• High accuracy – Temp. ±0.4 °C | Humidity ±2.5 %RH | Pressure ±2 hPa
• Air pressure trend over last 3 hours – detects weather changes
• Acoustic and optical alarm – immediate warning when limits are exceeded
• Min/Max memory & Hold function – record extremes and manual snapshots
• Backlit LCD – clear readability even in low light
• Traceable calibration certificate included – maximum reliability
• Mobile battery supply – approx. 6 months runtime (9 V block or NiMH battery)
• 3-year warranty – guaranteed COMET quality

Technical data D4141:

• Internal temperature: -10 to +60 °C (±0.4 °C)
• External temperature: -30 to +105 °C (±0.4 °C)
• External humidity: 5 to 100 %RH (±2.5 %RH from 5 to 95 % at 23 °C)
• Dew point: -50 to +80 °C (±1.5 °C at T<25 °C and RH>30 %)
• Internal air pressure: 800 to 1100 hPa (±2 hPa at 23 °C)
• Resolution: 0.1 °C / 0.1 %RH / 0.1 hPa
• Alarm: acoustic + optical (adjustable limits)
• Memory: 16,000 values (non-cyclic or cyclic)
• Recording interval: 10 s to 24 h (adjustable)
• Measuring interval / display update: 0.7 to 5 s
• Display: backlit LCD
• Power supply: 9 V battery or 12 V DC adapter with NiMH 9 V battery
• Battery life: approx. 6 months
• Operating temperature: electronics -10 to +60 °C, external probe -30 to +105 °C
• Protection rating: IP20
• Dimensions (without connector): 191 × 71 × 27 mm
• Weight (incl. battery): approx. 155 g
• Warranty: 3 years

Perfectly suited for:

• Long-term indoor climate monitoring in offices and warehouses
• Climate chambers and incubators
• Museums, archives, and art storage
• Cold chains and pharmaceutical storage
• Food and beverage production
• Process monitoring and quality control
• Mobile climate measurement in field applications
• Reference measurements and documentation

Installation and operation – ready for immediate use

Connect the external probe, insert the battery or connect the power adapter – done! Set limit values, start logging – later transfer data to your PC via USB. The backlit display and acoustic alarm ensure safe and convenient operation. Calibration certificate included – ideal for audits and quality management.

Available variants:

• Cable length 1 meter
• Cable length 2 meters
• Cable length 4 meters

Summary:

• Thermometer, hygrometer, and barometer for measurement and data recording of temperature, relative humidity, and air pressure with internal non-volatile memory
• Air pressure trend display
• Free PC software for transferring and analyzing logged data
• Acoustic and optical alarms on limit exceedance
• Storage of minimum and maximum values
• Hold function: manual storage of current readings for later display
• Data logger connects to PC via supplied USB cable exclusively for data transfer
• No measurement or recording possible while connected to PC
• Thermometer, hygrometer, and barometer with external air temperature and humidity probe
• Probe diameter: 18 mm, length: 135 mm
• Integrated sensors for internal temperature and barometric pressure

Scope of delivery:

• D4141 – with selected cable length
• User manual
• Traceable calibration certificate
• 9 V battery
• Mini USB cable
• Plastic transport case
• Self-adhesive double lock for easy installation
• FREE full version of COMET Vision analysis software