GP-MC - Multi Purpose Data Logger:

Product Specifications:

Download Datasheet


The GP-MC is a high resolution (12 bit) multi purpose data logger with eight analogue and two digital pulse inputs. It supports an additional 15 channels of input from remote sensors on an RS485 interface. It also provides a Start on Trigger input and two alarm outputs. The GP-MC can be supplied in an optional IP66 Weatherproof enclosure if required. It can be configured to accept input from a wide variety of sources including:

  • 4~20mA Probes
  • Voltage (DC)
  • Current (DC)
  • Temperature Probes
  • Pressure Probes
  • Flow Sensors
  • Frequency
  • Switches
  • * Thermocouple * (see below)
  • Potentiometers
  • Light Sensors
  • Leaf Wetness Sensor
  • Soil Water Tension Probes
  • Wind Speed Probes
  • Wind Direction Sensors
  • Tipping Bucket Rain Gauges
  • Solar Radiation Sensors

The GP-MC also has an internal temperature sensor for convenient logging of ambient temperature if desired.

One to Five year battery life depending on usage as below, user replaceable. Data is retained in the event of battery failure. Battery Status Monitor in OmniLog Software.

Download cable for GP-MC = DLC5USB [USB] or DLC5 [RS232] (Standard 2m DB9 Male/Female RS232 Serial Cable)

Ordering Information:

Order code:


GP-MC Multi Purpose data logger
Seahorse Optional IP66 Weather Proof Enclosure for GP-MC outdoor use
GP-MC - RS485 Channel Expansion (Maximum 15 channels total)
RPC Remote Probe Controller (Channels = 3x Analogue, 1x Fast Pulse)

Standard Probe Sets; Other types available - Contact Intech Instruments:

mA-MC-PS One 4~20mA or 0~20mA input
##VD-MC-PS One Voltage input - available ranges are: 5VD-MC-PS = 0~5Vdc,
10VD-MC-PS = 0~10Vdc, 24VD-MC-PS = 0~24Vdc, 32VD-MC-PS = 0~32Vdc. Or any voltage between 0 and 32Vdc.
Note: The maximum voltage input via probe set for the GP-MC is 32Vdc - for voltages above 32Vdc an intermediary transmitter like the PI-D must be used.
Pt1000-MC-PS Pt1000 Temperature Probe, range -50~130ºC
Note: GP-MC maximum Pt1000 temperature range is -100 ~ 400ºC
P###-MC-PS Pressure Probe - available ranges are: P100-MC-PS = -15~100psi,
P250-MC-PS = -15~250psi, P500-MC-PS = -15~500psi
Flow-MC-PS Coil or open collector
ACM-MC-PS Flow metering off the pump run contact

Download options:

OmniLog Software (used with all TruTrack data loggers):
OmniLog Installation CD and USB download cable Kit
OmniLog Installation CD and RS232 download cable Kit
Spare download cable:
GP-MC USB download cable
GP-MC RS232 download cable (Standard 2m DB9 Male/Female RS232 Serial Cable)

Note: GP-MC inputs are individually configurable using OmniLog. Each input requires conditioning using a 'Probe Set' - see example picture below:

GP-MC Inputs

External Power Input:

The GP-MC has an internal battery which powers the logger and probes. However, it can also be powered by an external 5V to 15V dc Plug Pack or Battery.
The main reasons for using the External power input are:

The Internal battery runs the logger if External power fails. There is an External Power Status Monitor in OmniLog software.

Please note that Intech Instruments' recommends the internal battery be left in place in case the external power supply fails. The internal battery will keep the logger going should this happen. More information below:

If the logger is run with no internal battery and the external supply fails the logger will turn off. When the external power supply is turned back on, the logger will reboot and will be in "Stopped" mode. The logger will need to be configured in "start on condition" mode and "loop" mode and the "Start Logger" button clicked to initialise the next recording cycle.
It is recommended that the internal battery is left in. No power is drawn from the internal battery when the external supply fails and the internal battery will keep the logger running during the down time. The logger will stay on standby and start on condition even if the external supply is still down.

* Logging Thermocouple inputs with the GP-MC:

A lot of people say thermocouple to mean temperature probes, where as if the temperature range they are measuring is between -50 and +200 degrees C, then Pt1000 is more accurate and cheaper to implement than thermocouple. The GP-MC accepts Pt1000 input (with the necessary resistors). Thermocouples are ideal for high temperature ranges.

The only way that the GP-MC can accept a thermocouple signal is via an intermediary transmitter like the XU Series with an output signal of 4~20mA. mA-MC-PS input cables for each input from the XU Series transmitter(s) into the GP-MC are also required.

If you wish to log only 1 thermocouple input then there are 2 possible options:

GP-MC RS485 Overview:

The RS485 interface is used to collect additional data from remote probes and sensors. These probes and sensors are connected to Remote Controllers that can communicate with the GP-MC logger over distances of up to 200 meters. A number of these controllers can be daisy chained together on the one RS485 interface. The GP-MC will support up to 15 additional channels from Remote Probe Controllers.
GP-MC RS485 expansion example diagram
The GP-MC will support up to 15 additional channels from remote probes and sensors via the RS485 interface.
The Remote Probe Controller (RPC) has 4 channels available, 3 analogue and 1 fast pulse. Each input requires conditioning using a 'Probe Set' (same types as those used with the GP-HR). The RPC Remote Probe Controller can supply up to 1mA for 30mSec at 3.6 volts to its probes and sensors.

Examples that achieve 15 channels: