COMET U3120M Series Wireless Temperature and Relative Humidity Datalogger User Manual

COMET U3120M Series Wireless Temperature and Relative Humidity Datalogger

Specifications:

• Device Types: U3120M(G), U3121M(G), U3631M(G), U3832G, U4440M(G), U8410M(G)
• Measured Values:
  • Ti + RH + Td + 1x cc
  • Te + RH + Td + 1x cc
  • Ti + Te + RH + Td + Tdiff + 1x cc
  • Ti + RH + Td + BIN_LD + 1x cc
  • Ti + RH + Td + P + CO2 + 1x cc CO2
• Construction:
  • Internal temperature and relative humidity sensor
  • Connector for an external Digi/E probe connection
  • Internal temperature and rel. humidity sensor and connector for the Pt1000/E probe connection
  • Internal temperature and relative humidity sensor and LD-81 flood detector
  • Internal sensors of temperature, rel. humidity, barometric pressure, and CO2 concentration
  • Internal sensor of CO2 concentration

Installation:

1. Fasten the device on the wall with two screws or insert it into the wall holder LP100 (optional accessory).
2. Datalogger may be operated as a portable one. In this kind of operation avoid the device falling down. Try to maintain the proper working position.

Operation:
The devices do not require special maintenance. We recommend checking the state of the battery (charge as needed) and regularly verifying the accuracy of measurements with calibration.

Warnings:

• Read carefully the Safety information for dataloggers with GSM modem before operating the device and observe it during use!
• Installation, electrical connection, and commissioning should only be performed by qualified personnel in accordance with applicable regulations and standards.
• Devices contain electronic components, it need to be liquidated according to currently valid conditions.
• To complement the information in this data sheet read the manuals and other documentation, which are available in the Download section for a particular device at www.cometsystem.com

COMET SYSTEM, s.r.o.

• Bezrucova 2901 756 61 Roznov pod Radhostem, Czech Republic
• Specifications are subject to change without notice May 2024 / IE-LGR-N-UxxxxM-b-03

PRODUCT DESCRIPTION

• The dataloggers are designed for measuring and recording physical and electric quantities with an adjustable logging interval from 1 second to 24 hours. The measured values (instantaneous or the average, minimum and maximum values detected during the recording interval) are stored in the internal non-volatile memory. The data logging mode can be cyclic (when the data memory is completely full, the oldest data are overwritten by the new ones), or non-cyclic (the recording will stop once the memory is full). For each measured value it is possible to set two alarm limits. The alarms are signaled by the symbols on the LCD display, by flashing the LED, by acoustic or by sending a warning SMS or JSON message. The data recording can be performed continuously or only when an alarm occurs.

• The dataloggers of the UxxxxM family contain a 2G (GSM) radio modem, and the dataloggers of the UxxxxG family contain a combined 2G/4G (GSM and LTE) modem. Using the modem, the device connects to the mobile operator’s network after inserting a suitable SIM card.

• The modem is used to send SMS messages to up to four selected recipients and to send the measured values using JSON messages, e.g. to the COMET Cloud (optionally to your own storage). In addition to alarm warning messages, SMS messages containing current measured values and alarm statuses can be sent at regular intervals.

• Device setting, data downloading and online monitoring are carried out using the computer with the COMET Vision software installed (see www.cometsystem.com). The USB interface is used to communicate with the computer.

• The datalogger is powered by an internal Li-Ion battery. The device includes a charging circuit, which is activated automatically when a standard USB charger is connected or after connecting a device to a computer. The charging takes place if the battery condition requires it and the internal temperature of the device is in the range 0 and 40 ºC. Fast charge mode can be run by turning off the device.

• Ti, Te…Temperature,

• RH…Relative humidity,

• Td…Dew point temp.,

• Tdiff…temp. difference,

• P…Barometric pressure,

• CO2…CO2 concentration,

• BIN_LD…Flood detector

• cc… calculated channel,

• ie the channel that can be used to calculate and record the value calculated from the measured quantities according to the selected formula

INSTALLATION AND OPERATION

Insert the micro-SIM card into the device (see other side of this sheet). Use a card with parameters conforming to the expected number of sent SMS messages and amount of received and transmitted data. If the SIM card is protected by PIN code, make a note it, and later insert this code into the device configuration. Proceed with care and avoid contact of the external conductive parts with the electronics of the device (the datalogger is constantly supplied from the internal battery). An optional accessory is a prepaid IoT SIM card (order code LP105) for sending data to the COMET Cloud. Please note that this card does not support the sending of SMS messages. The UxxxxMsim and UxxxxGsim kits with built-in IoT SIM card (e.g. U3121Msim) allow instant connection to the COMET Cloud. Fasten the device on the wall with two screws or insert it into the wall holder LP100 (optional accessory). Datalogger may be operated as a portable one. In this kind of operation avoid the device falling down.

Try to maintain the proper working position.

• The dataloggers always install vertically (with the antenna facing up) into locations with sufficient mobile operator signal quality. Insufficient signal level can be in reinforced concrete buildings, metal chambers and other shielded areas.
• Connect the probes to the device (the maximum length of cables should not exceed 30 m, the recommended maximum cable length of the Pt1000/E probe is 15 m). The unused probe connectors should be provided with a supplied closing cap.
• The devices with all cables should be located as far as possible from potential interference sources

Set-up the device

• Connect the datalogger with the attached probes to the computer. Use a USB cable with a USB-C connector (max. cable length 3 m).
• Run the installed COMET Vision software and select the device you want to set up from the device list
• Click on the Configuration button. The device configuration will be downloaded and you can change the setup of individual items.
• Finally, save the new configuration into the device (Apply changes)

The devices do not require special maintenance. We recommend checking the state of the battery (charge as needed) and regularly verifying the accuracy of measurements with calibration.

WARNING
Read carefully the Safety information for dataloggers with GSM modem before operating the device and observe it during use!

• Installation, electrical connection and commissioning should only be performed by qualified personnel in accordance with applicable regulations and standards
• Devices contain electronic components, it needs to liquidate them according to currently valid conditions.
• To complement the information in this data sheet read the manuals and other documentation, which are available in the Download section for a particular device at www.cometsystem.com

Technical specifications

1. device accuracy without probe in the range of -200 °C to +100 °C is +0.2 °C, in the range of +100 to +260 °C is accuracy +0.2% of measured value
2. at a temperature 23 °C in the range of 0 to 90 %RH (hysteresis 1 %RH, non-linearity 1 %RH)
3. at ambient temperature T < 25 °C and relative humidity RH > 30 %RH (for details see graphs in the instruction manual)
4. temperature dependence in the range -20 to +60 °C is typ. #(1+MV/1000) ppmCOz/°C, where MV is measured value

FAQ

Q: How often should I calibrate the device?
A: It is recommended to verify the accuracy of measurements with calibration regularly. The frequency of calibration may vary based on usage and environmental conditions.

Q: Can I operate the datalogger as a portable device?
A: Yes, the datalogger can be operated as a portable device. When using it in this manner, ensure it is securely fastened to avoid falling.

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