Multilogger is a device for measuring physical and electrical quantities. The device combines the main advantages of hand-held battery equipment together with stationary measuring multi-channel data loggers. The Multilogger can be connected to the Internet network through the Ethernet port.
Evaluation of up to 16 variables
Up to 16 variables may be calculated from the four connected probes / sensors. This is the sum of the measured and calculated values. The calculated values can be a further expression of moisture – dew point temperature, absolute humidity, specific humidity, mixing ratio, specific enthalpy. It can be also the result of inter-channel conversions, e.g. the difference of two connected temperature probes.
The measured values are stored in the internal non-volatile memory. Memory capacity is up to 1 million values. Logging mode can be adjusted as non-cyclic, when logging stops after filling the memory, or cyclic, when after fulfilling the memory oldest stored values are overwritten by new ones.
Measured values are displayed on the screen with backlight option and the ability to change the size of display digits.
Multilogger can be powered by AC adapter or by rechargeable batteries with charging capability. Batteries are always a part of the device (you can also use standard alkaline AA batteries). Batteries power the device for several months.
While using the AC adapter, the batteries provide backup operations and provide recording and measurement during power failure. Thanks to the Ethernet output the device informs about the failure via e-mail message.
Alarm Limits and Alarm Indication
It is possible to set two independent alarm limits for each channel (i.e. measured or calculated value).
Alarm signalization can be acoustic (built-in beeper), optical, sending an e-mail alert or an alarm output. The alarm output is for connecting an external audio or visual alarm.
Two-state output is designed to control other devices.
Multilogger is always equipped with USB connector for communication, data analysis and also for charging of the rechargeable batteries.
Included Ethernet interface allows to:
- send an e-mail when an alarm state starts or ends
- use DATALINK: display current values or download values from memory to Comet Database in your PC.
Software Comet Database contains many useful tools for data analysis - graphs, tables, statistics, etc.
- simple wireless communication with Wi-Fi TP-LINK router
- third-party applications to read the actual measured values using universal protocols SNMPv1 and XML
- view current measured values using your web browser
Serial communication interface RS232 is also designed for connection the computer and data downloading. Also it is mentioned for connecting of GSM modem.
Two-state Alarm output is designed for controlling other devices, such as external buzzer, telephone dialer etc.
4 inputs / 3 types of connectors
All models have 4 input connectors for external probes or signals. These may be supplemented by an internal atmospheric pressure transducer and / or CO2 sensor.
Probes and sensors are connected to the device using 3 different types of connectors. There are 9 Multilogger model versions, with different input connectors and internal sensors combinations.
- Temperature probes Pt1000
- Temperature / Relative humidity probes with digital output
- Thermocouple K, J, S, B, T, N
- Sensors with bipolar output voltage. Two ranges available: from -18mV to +18mV and from -60mV to +140mV (heat flux sensors, pyranometers etc.)
- Devices with two-state output (monitoring of machine run, door open / close, etc.)
- Device with pulse output (gas and water meters, counter pieces on a production line, etc.)
- Sensors of physical quantities with voltage output 0 - 10 V (0 - 5 V, 0 - 1 V) or current output 0 - 20 mA (4 - 20 mA)
The temperature can be measured by Pt1000 or thermocouple probes.
Measurement range for Pt1000 is -200 °C to +600 °C. The probes must be fitted with a MinDIN connector where information about constants and the cable length of the probe is stored. Probes can be interchange easily without adjusting the compensation of the cable length.
The temperature of range -30 °C to +105 °C can be measured with a combined temperature and humidity probe DIGI. Probes can be interchange easily without adjusting the compensation of the cable length. Probes may be supplied in lengths of 1, 2, 5, 10, 15 meters. All DIGI probes are supplied with a calibration certificate.
Multilogger with a thermocouple connector supports thermocouple probe type K, J, S, B, T, N and it is possible to measure temperature in the range from -200 °C to +1800 °C.
Humidity can be measured by a combined temperature and humidity probe DIGI in the temperature range from -30 °C to +105 °C; humidity range from 0 to 100% RH.
Probes can be interchange easily without adjusting the compensation of the cable length. Probes may be supplied in lengths of 1, 2, 5, 10, 15 meters. All DIGI probes are supplied with a calibration certificate.
Measured values are also converted to other humidity interpretation: dew point temperature, absolute humidity, specific humidity, mixing ratio and specific enthalpy.
DIGIL/M - temperature and relative humidity probe with digital output and filter from stainless steel mesh, filtering ability 25μm. Temperature range -30 °C to +105 °C. Humidity measurement range 0 to 100% RH.
DIGIS/M - temperature and relative humidity probe with digital output. Temperature range -10 °C to +60 °C. Humidity measurement range of 5 to 95% RH.
The CO2 measurement is based on a 2-source, 2-beam process. CO2 measurement with long-term stability is guaranteed thanks to the proven non-dispersive infrared (NDIR) CO2 measurement cell. The unique patented auto-calibration procedure compensates for aging of the infrared source and guarantees high reliability, long term stability and eliminates the need of periodical recalibration in the field.
Pulse signals may only be applied to input number 4. Contact / voltage signal or open-collector transistor for reading pulses from water meter, gas meter or from the production line.The counter can also be set as relative - the number of pulses per measurement interval.
Connection of the binary and counter input
Measured current or voltage can be converted and recorded in values of a measured quantity.
Quantity sensors connected to the device must be powered from an external source.
Termoucouple input allows connection of sensor with bipolar output voltage and range of - 60 to + 140 mV (e.g. heat flux sensors, etc.).
Two-state signals may only be applied to input number 3 and 4. This input is useful for monitoring of the machine running, opening / closing doors, etc.
Connection of the binary and counter input
4 - 20 mA
0 - 10 V