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GP-MC General Purpose Multi Channel Logger

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The GP-MC is a high resolution (12 bit ) multi purpose Data Logger with eight analog 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: 

 

  • Tipping Bucket Rain Gauges
  • Temperature Probes
  • Solar Radiation Sensors
  • Light Sensors
  • 4-20mA Probes
  • Switches
  • Voltage (DC)
  • Current (DC)
  • Pressure Probes
  • Leaf Wetness Sensor
  • Soil Water Tension Probes
  • Potentiometers
  • Wind Speed Probes
  • Wind Direction Sensors
  • Flow Sensors
  • Frequency
TT GP-MC.jpg (50129 bytes)

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Specification:
External Connectors:
Type
4 x 4way terminal block for eight analog inputs
1 x 4way terminal block for two digital pulse inputs
1 Female 9pinD for RS232 Communications
1 x 5way terminal block  for two Alarm outputs and one Trigger input
1 x 4way terminal block  for RS485 interface to remote probes
External Connector Layoutype GP-MC_pinout.jpg (40167 bytes)
Pinout for Analog Inputs
There are 4 of these on the logger
  • P1 for Channel 1 & 2
  • P2 for Channel 3 & 4
  • P3 for Channel 5 & 6
  • P4 for Channel 7 & 8
1   Switched Reference voltage
2  First Analog Input (Channel 1,3,5 or 7)
3  Second Analog Input (Channel 2,4,6 or 8)
4  Common Ground 
sensors connect to
screw terminals on
this side of connector
block
MC_Analog_pinout.gif (2723 bytes) this side of connector
block plugs into
GP-MC logger P1,P2,
P3 and P4
Pinout for Pulse Inputs
1  Supply Voltage (Not switched)
2  Slow Pulse input Input (Channel 9)
3  Fast Pulse Input (Channel 10)
4  Common Ground 
sensors connect to
screw terminals on
this side of connector
block
MC_Analog_pinout.gif (2723 bytes) this side of connector
block plugs into
GP-MC logger P5
Pinout for RS232 Communications
1  NC
2  TX
3  RX
4  CTS
5  Common
6  NC
7  NC
8  Aux TX
9  Aux Battery Monitor
9pinD.gif (2806 bytes) Rear of Female
9pinD and
Front of Male
9pinD
Pinout for Alarms and Trigger
1  Common Ground
2  Alarm 2 (Red ) Out
3  Alarm 1 (Yellow ) Out
4  Start on Trigger Input
5  Supply Voltage (Not switched)
alarm outputs and
"start on trigger" input
connect to screw
terminals on this side of
connector block
MC_Alarm_pinout.gif (3014 bytes) this side of connector
block plugs into
GP-MC logger P6

 

Pinout for Power In (5V to 15V DC)
1 Ground
2 Power In (5V to 15V DC)
External Power Supply connects to
screw terminals on
this side of connector
block
MC_Power_In.jpg (5345 bytes) this side of connector
block plugs into
GP-MC logger P7
Pinout for RS485 Communication
1  Supply Voltage (Not switched)
2  RS485 B
3  RS485 A
4  Common Ground 
sensors connect to
screw terminals on
this side of connector
block
MC_Analog_pinout.gif (2723 bytes) this side of connector
block plugs into
GP-MC logger P8
Eight Analogue Channels:
To log any combination of:
Temperature Wind Direction
Humidity Soil Moisture Tension
Pressure Leaf Wetness
Light Voltage (DC)
Solar Energy Current (DC)
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The eight analog channels have identical characteristics. Each channel can operate in two modes, Absolute and Ratiometric. The mode of operation is determined by the probe type selected for that channel. The probe type is selected using the Channel and Probe Setup Tab of the Logger Control Screen in the Omnilog Software. Using this software, a different Probe can be selected for each Channel. Temperature (Thermister) , Pressure and Humidity probes are typically Ratiometric. Voltage and current inputs are Absolute.

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Maximum readable input voltage in Ratiometric mode 3.6 Volts Nominal (see note)
Maximum readable input voltage in Absolute mode 2.048 Volts
Maximum voltage input without damaging logger 5 Volts
Maximum current to be drawn by the combination of all eight probes 50mA
Input Leakage Current 0.001uA typ  1uA Max
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One Fast Pulse Digital Channel
To log:
Wind speed
Counter (up to 65535)
Flow
Frequency (up to 60 kHz)
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The fast pulse input can be used in two modes, Counter or Frequency.
Counter mode is used for  functions such as rainfall.  Frequency Mode is used  for wind speed or flow sensors. The mode of operation is determined by the probe type selected for that channel. The probe type is selected using the Channel and Probe Setup Tab of the Logger Control Screen in the Omnilog Software.

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Maximum Count Per Logging Period 65535
Maximum Frequency with logging period set to 1sec 60kHz
Preferred Switch Input Type Normally Open
Preferred Digital Input Type Normally High
Minimum High Period 1uSec
Minimum Low Period 1uSec
Input Impedance 470 kOhm
Preferred voltage input 3.6 Volts
Maximum voltage input 5.0 Volts
One Slow Pulse Digital Channel
To log:
Rainfall
Slow Counter (up to 65535)
Low Frequency (up to 10Hz)
Slow Flow (up to 10 pulses per sec)
The slow pulse input can be used in two modes, Counter or Frequency.
Counter mode is used for  functions such as rainfall. 
Frequency Mode is used  for Low frequency or slow flow sensors. The mode of operation is determined by the probe type selected for that channel. The probe type is selected using the Channel and Probe Setup Tab of the Logger Control Screen in the Omnilog Software.

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Maximum Count Per Logging Period 65535
Maximum Frequency 10Hz
Preferred Switch Input Type Normally Open
Preferred Digital Input Type Normally High
Minimum High Period 1mSec
Minimum Low Period 1mSec
Input Impedance 470 kOhm
Preferred voltage input 3.6 Volts
Maximum voltage input 5.0 Volts
RS485 interface to fifteen remote probes or sensors:
The RS485 interface is used to collect data from remote probes and sensors. These probes 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. There are fifteen remote channels available on the GP-MC that can be set to log data from probes and sensors on remote controllers. At present there are three types of RS485 remote data collection devices that can be connected to the GP-MC.

GP-MC RS485 Overview  

1... Remote Probe Controller (RPC)

This device has three analog inputs and one fast pulse input. It is powered from the GP-MC. It has no data storage. When the GP-MC requests data, the RPC converts its inputs and returns its results to the GP-MC via the RS485 interface.

RPC Remote Probe Controller Technical Specification 

2... Remote Powered Probe Controller (RPPC)

This device has three analog inputs. It is self powered. The RPPC reads it's probes at a period selected by the user on a dip switch inside the device. When the GP-MC requests data, the RPPC returns the results of the last reading to the GP-MC via the RS485 interface. 

The ordinary RPC Remote Probe Controller can supply up to 1mA for 30mSec at 3.6 volts to its probes and sensors. If the probes and sensors require more current, more time, or more voltage a RPPC Remote Powered Probe Controller must be used. The device can sample three analog inputs. Dip switches in the unit control the sample interval, the power up time for the probes before a sample is taken and the channel input mode (0~2V or 0~20mA). The unit holds the sample data until it is requested by the GP-MC on an RS485 Line.

RPPC Remote Powered Controller Technical Specification

 

3...  Remote Frost Flasher (RFF)

This is a Frost Warning Device that monitors air temperature and triggers a flasher alarm as the temperature drops toward frost conditions. It is primarily used in orchards and vineyards that use helicopters to break up inversion layers and push warm air down in to areas that might frost. As supplied, the unit flashes as follows:

1 flash per two sec Temperature has dropped below 3º C

2 flashes per 2 sec Temperature has dropped below 2º C

3 flashes per 2 sec Temperature has dropped below 1º C

Flashing Stops Temperature as risen to above 5º C

These trigger temperatures are programmable.

The temperature probe of the RFF Remote Frost Flasher can be monitored and logged by a GP-MC

RFF Remote Frost Flasher Technical Specification

 

Internal Temperature:
Sensor Type Thermister
Linear accuracy over range ± 0.3º C (0º C to 70º C)
Repeatability ± 0.1º C
Long term stability ± 0.1º C
Logger:
Working Temperature -30º C to +70º C
Storage Temperature -30º C to +70º C
Sampling Rate
1 second minimum
10 hours maximum
in 1 second intervals
Storage capacity
1000,000 8 bit samples
500,000 12bit samples
Alarms
Two independent Alarms
Triggered on any combination of six user configurable Alarm Conditions
Two Open Collector Alarm outputs
One alarm can be configured to dial a PocketPager
Alarms can be visually checked using the Omnilog Software
Start modes
Start immediately
Start on date/time.
Start on Trigger (Trigger input line)
Start on Condition (Start when a selected channel meets a condition
Stop modes
Stop when memory is full
Stop on date/time
Loop around (continues logging)
Logging Modes
Each channel can be set to log any combination of: 
  • Point readings
  • Average reading
  • Maximum reading
  • Minimum reading
Battery
User Replaceable
One AA 3.6V lithium cell
Five year life. 
The data is retained in the case of battery failure.
Battery Status Monitor in OmniLog Software
External Power Input
5V to 15V DC Plug Pack or Battery
Internal battery runs logger if External Power fails
Can be used to run logger while internal battery is changed
Used when large current draw fron probes would flatten Internal Battery
Used at very low temperature (< 10º C) where Internal Battery voltage can drop
External Power Status Monitor in OmniLog Software
Download Time 16 minutes for Full Logger
Case material PVC
IP Rating
GP-MC for indoor use only IP54
GP-MC with Optional Weather Proof Box IP66
Weight 200g
Size 140mm X 100mm X 25mm
Applications:
A Thermister Temperature Sensor can be connected to any of the eight analog inputs of the GP-MC
For a 10k ohm thermister (Beta 3892 Farnell Part no 151-591 or 732-242) the excitation resister (R1) must have a value of 15k ohms and an error of 0.1% or less

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A voltage divider can be connected to any of the eight analog inputs of the GP-MC

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Nominal Prefered Prefered Actual
Input Value R1 Value R2 Fullscale
2.5V 22k 75k 2.6V
5V 62k 39k 5.3V
6V 68k 33k 6.3V
9V 82k 22k 9.7V
10V 62k 15k 10.5V
12V 75k 15k 12.3V
15V 68k 10k 16.0V
18V 82k 10k 18.8V
24V 75k 6k8 24.6V
28V 91k 6k8 29.5V
32V 100k 6k8 32.2V
40V 91k 4k7 41.7V
50V 82k 3k3 52.9V

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The eight inputs of the GP-MC can be used as mA inputs
For 0 to 20mA and 4 to 20mA applications R1 =
68ohm 0.1% 25ppm

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The slow pulse input on the GP-MC can be used to read the switch closures from a Tipping Bucket Rain Gauge
R1 =
1K ohm
C1 =
0.1uF

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A potentiometer can be connected to any of the eight analog inputs of the GP-MC
Recommend value = 10kohm to 100kohm

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Switches can be connected to any of the eight analog inputs of the GP-MC
DPST switches require no other components
SPST switches require a pull up resistor

R1 = 200 K Ohms to 1M Ohm depending on distance from switch to logger

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