Delta-T GP1 Logger Quick Start Guide
Delta-T GP1 Logger is a compact research-grade data logger with differential voltage channels, versatile relay channel, temperature and counter channels and WET sensor serial data channel. It's designed for a wide range of applications, including environmental monitoring, soil moisture measurement, irrigation control, and weather station systems. The GP1 Logger is compatible with various sensor types, including soil moisture probes, temperature sensors, rain gauges, and sunshine sensors. It features a user-friendly interface and can be programmed to log data at specific intervals and store it internally. Remote data collection is possible with the optional GPRS modem system.
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GP1 Data Logger
Compact Research-Grade Logger with Differential Voltage
Channels, Versatile Relay Channel, Temperature and Counter
Channels and WET sensor serial data channel
Quick Start Guide v4.0
Delta-T Devices Ltd
Compact Research-Grade Logger with Differential Voltage
Channels, Versatile Relay Channel, Temperature and Counter
Channels and WET sensor serial data channel
Quick Start Guide v4.0
Delta-T Devices Ltd
2016 Delta-T Devices Ltd Page 2Event5,6
Counter
Channels
5 & 6
Temp3
Thermistor
CH1
Differential
Analogue
Voltage
WET sensor input
Switched Reference
+5V (ref)
Relay
Channel
M8 Connector
RS232 and
External Power
Temp4
Thermistor
CH2
Differential
Analogue
Voltage
4x Cable Glands Reset Button
Status LED
4x Sealing
Bungs
Unpacking
The GP1 package contains:
ï‚· GP1 Logger (with 9V alkaline battery fitted)
ï‚· GP1 to PC serial cable
ï‚· DVD with DeltaLINK-PC software and documentation
ï‚· This GP1 Quick Start Guide
ï‚· Screwdriver and optional security screws (to replace thumb screws)
The following accessories are available:
 GP1 Mounting Kit (GP1-MP1) – stainless steel mounting plate with fittings
 External power cable (GP1-RSP-M8 or GP1-RSP-D)) – to power GP1 from 12V to 24V DC
 Network cabling and connectors – for networking up to 10 GP1, DL6 or GP2 loggers
 Annual maintenance kit (GP1-AMK1) – contains battery, desiccant, M8 connector cover, etc
 GPRS Modem System – for remote data collection from GP1, GP2 and DL6 loggers or
connection to DeltaLINK-Cloud.
ï‚· Precision Bridge Adapter (GP1-PBA-x50) - for tensiometers and bridge sensors
The following sensors are supported:
 Temperature sensor – ±0.20C 10k thermistor with 5m lead (ST4-05), 10m lead (ST4-10)
 SM150 Soil Moisture Sensor – four total may be fitted
 SM150T, SM300 and ML3 Soil Moisture Sensor – two total may be fitted
ï‚· BF3 Sunshine Sensor (BF3) or SPN1 Sunshine Pyranometer (SPN1)
ï‚· Rain gauge (RG1 or RG2)
ï‚· WET sensor (WET-2) - one may be fitted
ï‚· Tensiometer (SWT4 & SWT5) - two may be fitted, require GP1-PBA1 adapters
ï‚· Equitensiometer (EQ2 & EQ3) two may be fitted
Overview
The GP1 has seven input and one output channel: two differential analogue voltage channels,
CH1 and CH2; two temperature/resistance channels, Temp3 and Temp4; event counter
channels, Event 5(fast) and Event 6(slow), a serial input channel for one WET sensor and a
relay output channel Relay.
Counter
Channels
5 & 6
Temp3
Thermistor
CH1
Differential
Analogue
Voltage
WET sensor input
Switched Reference
+5V (ref)
Relay
Channel
M8 Connector
RS232 and
External Power
Temp4
Thermistor
CH2
Differential
Analogue
Voltage
4x Cable Glands Reset Button
Status LED
4x Sealing
Bungs
Unpacking
The GP1 package contains:
ï‚· GP1 Logger (with 9V alkaline battery fitted)
ï‚· GP1 to PC serial cable
ï‚· DVD with DeltaLINK-PC software and documentation
ï‚· This GP1 Quick Start Guide
ï‚· Screwdriver and optional security screws (to replace thumb screws)
The following accessories are available:
 GP1 Mounting Kit (GP1-MP1) – stainless steel mounting plate with fittings
 External power cable (GP1-RSP-M8 or GP1-RSP-D)) – to power GP1 from 12V to 24V DC
 Network cabling and connectors – for networking up to 10 GP1, DL6 or GP2 loggers
 Annual maintenance kit (GP1-AMK1) – contains battery, desiccant, M8 connector cover, etc
 GPRS Modem System – for remote data collection from GP1, GP2 and DL6 loggers or
connection to DeltaLINK-Cloud.
ï‚· Precision Bridge Adapter (GP1-PBA-x50) - for tensiometers and bridge sensors
The following sensors are supported:
 Temperature sensor – ±0.20C 10k thermistor with 5m lead (ST4-05), 10m lead (ST4-10)
 SM150 Soil Moisture Sensor – four total may be fitted
 SM150T, SM300 and ML3 Soil Moisture Sensor – two total may be fitted
ï‚· BF3 Sunshine Sensor (BF3) or SPN1 Sunshine Pyranometer (SPN1)
ï‚· Rain gauge (RG1 or RG2)
ï‚· WET sensor (WET-2) - one may be fitted
ï‚· Tensiometer (SWT4 & SWT5) - two may be fitted, require GP1-PBA1 adapters
ï‚· Equitensiometer (EQ2 & EQ3) two may be fitted
Overview
The GP1 has seven input and one output channel: two differential analogue voltage channels,
CH1 and CH2; two temperature/resistance channels, Temp3 and Temp4; event counter
channels, Event 5(fast) and Event 6(slow), a serial input channel for one WET sensor and a
relay output channel Relay.
2016 Delta-T Devices Ltd Page 3
Sensor Wiring
SM150T, SM150, SM300 and ML3 soil moisture probes:
Connect to channels CH1+Temp3 or CH2+Temp4 as follows:
CH1/2 (+) Blue Signal HI
CH1/2 (--) Black Signal LO
CH1/2 (GND) Brown Power 0V or Temp(GND)
Green Screen
CH1/2 (PWR) White Power V+
Temp3/4 (IN) Grey Temperature +
Note: Ensure any pre-fitted wire link is removed between (-) & (GND)
Two more SM150T, SM150, SM300 or ML3 sensors can be added, to Temp3 and/or
Temp4 channels to measure soil moisture - if temperature readings are not required1:
Temp3/4 (IN) Blue Signal HI
Temp3/4 (GND) Black Signal LO
CH1/2 (GND) Brown Power 0V
Green Screen
CH1/2 (PWR) White Power V+
Other voltage Sensors:
Connect to channels CH1 or CH2 as follows:
CH1/2 (+) +ve sensor output
CH1/2 (--) -ve sensor output
CH1/2 (GND)
Braid or screen, if required
Switched power to sensor -ve, if required
Link to CH1/2 (--) if the sensor output is single-ended
CH1/2 (PWR) Switched power to sensor +ve, if required
10K, 2K Thermistor Temperature probes (e.g ST1)
and Resistance sensors
Connect to (IN) and (GND) terminals of channel Temp3 or Temp4.
Connect any braid or screen to the (GND) terminal if required.
Note: connection polarity is not important when using thermistors or rain gauges.
BF5 Sunshine sensor and SPN1 Sunshine Pyranometer
See BF5 and SPN1 User Manuals, Quick Starts and DeltaLINK programs.
WET sensor
See WET GP1 Logging Quick Start installed on your PC under DeltaLINK, Help, Document
Library, GP1 and DL6 or download it from www.delta-t.co.uk.
1 Note: single -ended connection in temperature channels
Sensor Wiring
SM150T, SM150, SM300 and ML3 soil moisture probes:
Connect to channels CH1+Temp3 or CH2+Temp4 as follows:
CH1/2 (+) Blue Signal HI
CH1/2 (--) Black Signal LO
CH1/2 (GND) Brown Power 0V or Temp(GND)
Green Screen
CH1/2 (PWR) White Power V+
Temp3/4 (IN) Grey Temperature +
Note: Ensure any pre-fitted wire link is removed between (-) & (GND)
Two more SM150T, SM150, SM300 or ML3 sensors can be added, to Temp3 and/or
Temp4 channels to measure soil moisture - if temperature readings are not required1:
Temp3/4 (IN) Blue Signal HI
Temp3/4 (GND) Black Signal LO
CH1/2 (GND) Brown Power 0V
Green Screen
CH1/2 (PWR) White Power V+
Other voltage Sensors:
Connect to channels CH1 or CH2 as follows:
CH1/2 (+) +ve sensor output
CH1/2 (--) -ve sensor output
CH1/2 (GND)
Braid or screen, if required
Switched power to sensor -ve, if required
Link to CH1/2 (--) if the sensor output is single-ended
CH1/2 (PWR) Switched power to sensor +ve, if required
10K, 2K Thermistor Temperature probes (e.g ST1)
and Resistance sensors
Connect to (IN) and (GND) terminals of channel Temp3 or Temp4.
Connect any braid or screen to the (GND) terminal if required.
Note: connection polarity is not important when using thermistors or rain gauges.
BF5 Sunshine sensor and SPN1 Sunshine Pyranometer
See BF5 and SPN1 User Manuals, Quick Starts and DeltaLINK programs.
WET sensor
See WET GP1 Logging Quick Start installed on your PC under DeltaLINK, Help, Document
Library, GP1 and DL6 or download it from www.delta-t.co.uk.
1 Note: single -ended connection in temperature channels
2016 Delta-T Devices Ltd Page 4
Fast event channel (Event5)
Use Event5 to monitor fast switch closures or pulses - up to
32 kHz, such as a flow meter.
A flow meter is shown connected to Event5 and GND.
Slow event channel (Event6)
Use Event6 to monitor slower switch closure or pulses (<50Hz)
such as a rain gauge.
A rain gauge is shown connected to Event6 and GND.
Note: To conserve battery life use Event5 for high
speed event monitoring, and Event6 for slow events.
Relay channel
The Relay channel is an open/close switch (default
condition open). The channel is protected with a
resetting poly-fuse and can switch up to 1A.
Status LED
Two flashes per ten seconds means the GP1 is logging.
Four flashes in a group indicates an error.
Reset Switch
In the unlikely event of the logger locking up, briefly press
the Reset button.
After pressing Reset, 4 LED flashes indicate that the GP1 is doing
a warm reset. Program and data are preserved and logging will
resume.
Hold Reset for more than 5 seconds to initiate a cold reset.
The status LED will flash four more times.
Cold reset restores the factory-set default program and deletes all data.
Analogue Channel Considerations
The differential analogue channels accept signals nominally 0 to 2.5V, with a full
signal range of -0.2 to +2.7V. Both analogue channels have a (PWR) connection
to allow the switched powering of sensors. Sensors can be powered with an
adjustable warm-up time prior to taking sensor readings. Power up times in
multiples of 1 second are permitted. The (PWR) connections supply sensors
with a switched unregulated battery voltage. Sensors requiring a regulated
supply may be powered from the switched +5V (ref) terminal.
Ensure each voltage input on the (+) or (-) terminals is kept within the permitted
input voltage limits (-2.8V to +3.6V relative to logger GND). If powered sensors
are not powered by the GP1, ensure these limits are not exceeded. The input
signal may need to be referenced to the logger ground. If the signal is floating
then fit a 10k resistor between the (-) and (GND) terminals.Reset Status
LED
Fast event channel (Event5)
Use Event5 to monitor fast switch closures or pulses - up to
32 kHz, such as a flow meter.
A flow meter is shown connected to Event5 and GND.
Slow event channel (Event6)
Use Event6 to monitor slower switch closure or pulses (<50Hz)
such as a rain gauge.
A rain gauge is shown connected to Event6 and GND.
Note: To conserve battery life use Event5 for high
speed event monitoring, and Event6 for slow events.
Relay channel
The Relay channel is an open/close switch (default
condition open). The channel is protected with a
resetting poly-fuse and can switch up to 1A.
Status LED
Two flashes per ten seconds means the GP1 is logging.
Four flashes in a group indicates an error.
Reset Switch
In the unlikely event of the logger locking up, briefly press
the Reset button.
After pressing Reset, 4 LED flashes indicate that the GP1 is doing
a warm reset. Program and data are preserved and logging will
resume.
Hold Reset for more than 5 seconds to initiate a cold reset.
The status LED will flash four more times.
Cold reset restores the factory-set default program and deletes all data.
Analogue Channel Considerations
The differential analogue channels accept signals nominally 0 to 2.5V, with a full
signal range of -0.2 to +2.7V. Both analogue channels have a (PWR) connection
to allow the switched powering of sensors. Sensors can be powered with an
adjustable warm-up time prior to taking sensor readings. Power up times in
multiples of 1 second are permitted. The (PWR) connections supply sensors
with a switched unregulated battery voltage. Sensors requiring a regulated
supply may be powered from the switched +5V (ref) terminal.
Ensure each voltage input on the (+) or (-) terminals is kept within the permitted
input voltage limits (-2.8V to +3.6V relative to logger GND). If powered sensors
are not powered by the GP1, ensure these limits are not exceeded. The input
signal may need to be referenced to the logger ground. If the signal is floating
then fit a 10k resistor between the (-) and (GND) terminals.Reset Status
LED
5
6
7
8
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Key Features
- Differential voltage channels
- Versatile relay channel
- Temperature and counter channels
- WET sensor serial data channel
- Compact and rugged design
- User-friendly interface
- Internal data storage
- Remote data collection (optional)
Related manuals
Frequently Answers and Questions
What sensors are compatible with the GP1 Logger?
The GP1 Logger supports a variety of sensors including soil moisture probes, temperature sensors, rain gauges, sunshine sensors, and WET sensors. The manual provides specific instructions for connecting each sensor type.
How do I program the GP1 Logger for my specific application?
Use the DeltaLINK-PC software to program the GP1 Logger. The software allows you to configure logging intervals, sensor types, and other settings. You can also use pre-configured programs for specific applications.
How do I retrieve and view logged data?
The DeltaLINK software allows you to download data from the GP1 Logger in a variety of formats. You can then view the data in a spreadsheet or other data analysis software.
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