Delta-T DL6 Quick Start Guide
Delta-T DL6 is a versatile soil moisture logger with 6 channels for soil moisture sensors, one for temperature, one for rain gauge, and a relay channel. It logs up to 16,000 readings and can be connected to your PC via a serial cable. The DL6 works with a variety of sensors, including Profile probes, SM series sensors, and ThetaProbe sensors, giving you flexibility to measure soil moisture in various settings.
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DL6 Data Logger
Soil Moisture Logger with 6 Soil Moisture Channels, Temperature and
Rain Gauge Channels and Versatile Relay Channel
Quick Start Guide Version 1.2
Delta-T Devices Ltd
Soil Moisture Logger with 6 Soil Moisture Channels, Temperature and
Rain Gauge Channels and Versatile Relay Channel
Quick Start Guide Version 1.2
Delta-T Devices Ltd
2016 Delta-T Devices Ltd Page 2
1 Unpacking
The DL6 package includes the following:
ï‚· DL6 Logger with alkaline batteries and DL6 to PC serial cable (DL6-RS232)
ï‚· CD with DeltaLINK-PC software
Optional accessories:
 Mounting Kit (DL6-MKT1) – 1 m stainless steel post, mounting plate with fittings.
 Spares Kit (DL6-SP) – fuse, desiccant, battery holder, cable glands, bungs & O-rings.
ï‚· Spare Alkaline batteries (DL6-BAT)
ï‚· Spare Lithium batteries (DL6-ELB)
Compatible sensors:
ï‚· One Profile Probe type PR2/4, PR2/6, PR1/4 or PR1/6 (see note*1)
ï‚· or up to six SM series Soil Moisture Sensors (SM150, SM150T, SM200 or SM300)
ï‚· or up to six ThetaProbe Soil Moisture Sensors (ML2 or ML3)
 and one temperature sensor – e.g. 2K thermistor (ST1, SM150T, SM300 or ML3)
ï‚· and one rain gauge (RG1 or RG2)
Note*1: Two soil moisture sensors can also be used along with a PR2/4 or PR1/4 Profile Probe
Note*2: Only one of the six SM150T or SM300 temperature sensors can be usedService, Specs and Notices
Unpacking
n
1 Install Software4
3
Program the
DL6
5
Check
Sensors
6
Retrieve,
View & Save
Logged Data
7
8
Layout2
Sensor Wiring
1 Unpacking
The DL6 package includes the following:
ï‚· DL6 Logger with alkaline batteries and DL6 to PC serial cable (DL6-RS232)
ï‚· CD with DeltaLINK-PC software
Optional accessories:
 Mounting Kit (DL6-MKT1) – 1 m stainless steel post, mounting plate with fittings.
 Spares Kit (DL6-SP) – fuse, desiccant, battery holder, cable glands, bungs & O-rings.
ï‚· Spare Alkaline batteries (DL6-BAT)
ï‚· Spare Lithium batteries (DL6-ELB)
Compatible sensors:
ï‚· One Profile Probe type PR2/4, PR2/6, PR1/4 or PR1/6 (see note*1)
ï‚· or up to six SM series Soil Moisture Sensors (SM150, SM150T, SM200 or SM300)
ï‚· or up to six ThetaProbe Soil Moisture Sensors (ML2 or ML3)
 and one temperature sensor – e.g. 2K thermistor (ST1, SM150T, SM300 or ML3)
ï‚· and one rain gauge (RG1 or RG2)
Note*1: Two soil moisture sensors can also be used along with a PR2/4 or PR1/4 Profile Probe
Note*2: Only one of the six SM150T or SM300 temperature sensors can be usedService, Specs and Notices
Unpacking
n
1 Install Software4
3
Program the
DL6
5
Check
Sensors
6
Retrieve,
View & Save
Logged Data
7
8
Layout2
Sensor Wiring
2016 Delta-T Devices Ltd Page 3
2 Layout
The DL6 is a nine channel logger with: 6 differential analogue channels suitable for soil
moisture sensors, one resistance channel suitable for a 2K thermistor, one event
counter channel suitable for a rain gauge, and one versatile relay channel.
Up to 16000 readings can be stored.
3 Sensor Wiring
Profile Probes
Profile Probe PR2/4 and PR2/6: use the PR2 to DL6 cable (PRC/M12-05) or choice
of extension cables (no wiring–up required).
Do not connect any other sensors to channels 1-4 or 1-6 respectively.
Profile Probe PR1/4 and PR1/6: Wire according to the colours printed beside the
terminals. Do not connect any other sensors to channels 1-4 or 1-6 respectively.
See the online PR1 Wiring Instructions Guide in the DeltaLINK Document Library
folder.Battery
connector
Reset Button
Fuse
Relay
Channel
Channel 8:
rain gauge
Channel 7:
temperature
Channels 1-6
for ML2, SM200 &
other sensors with
voltage outputs
PR2
connector
Channels 1-6
for PR1 wiring
RS232 Connector
Status LED
8x Cable
Glands
8x Sealing
Bungs
ML3, SM150T
2 Layout
The DL6 is a nine channel logger with: 6 differential analogue channels suitable for soil
moisture sensors, one resistance channel suitable for a 2K thermistor, one event
counter channel suitable for a rain gauge, and one versatile relay channel.
Up to 16000 readings can be stored.
3 Sensor Wiring
Profile Probes
Profile Probe PR2/4 and PR2/6: use the PR2 to DL6 cable (PRC/M12-05) or choice
of extension cables (no wiring–up required).
Do not connect any other sensors to channels 1-4 or 1-6 respectively.
Profile Probe PR1/4 and PR1/6: Wire according to the colours printed beside the
terminals. Do not connect any other sensors to channels 1-4 or 1-6 respectively.
See the online PR1 Wiring Instructions Guide in the DeltaLINK Document Library
folder.Battery
connector
Reset Button
Fuse
Relay
Channel
Channel 8:
rain gauge
Channel 7:
temperature
Channels 1-6
for ML2, SM200 &
other sensors with
voltage outputs
PR2
connector
Channels 1-6
for PR1 wiring
RS232 Connector
Status LED
8x Cable
Glands
8x Sealing
Bungs
ML3, SM150T
2016 Delta-T Devices Ltd Page 4
Single-ended voltage sensor (e.g. SM200)
The picture shows an SM200 single-ended sensor
connected and powered from Channel 1.
Note: Ensure a wire link is fitted between IN- and 0V.
Differential voltage sensor (e.g. ML3)
The picture shows an ML3 soil moisture sensor connected and powered from
Channel 1 and its temperature sensor connected to the resistance channel.
Function Colour
(ML3) DL6 terminal
Power to sensor White V+
Power return Brown 0V
Signal +ve Blue IN+
Signal -ve Black IN-
Temperature + Grey RES IN+
Cable screen Green
Temperature / Resistance channel 7 (e.g. ST1)
The picture shows a 2K thermistor temperature sensor connected
to channel 7. Connect between IN+ and IN-.
Connect any braid or screen to the terminal if required.
Rain gauge / Count channel 8 (e.g. RG1)
Use this channel to monitor slow events such as a rain gauge.
A rain gauge is shown connected to IN+ and IN- terminals.
This channel can be used to initiate dual-rate logging.
Refer to online Help for detailed information.
Note: the polarity of cable connection is not important when
using thermistors or rain gauges.
Relay (alarm) 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.
Function Colour
(SM200) DL6 terminal
Power to sensor Red V+
Signal White IN+
Ground Shield IN-and 0V
Single-ended voltage sensor (e.g. SM200)
The picture shows an SM200 single-ended sensor
connected and powered from Channel 1.
Note: Ensure a wire link is fitted between IN- and 0V.
Differential voltage sensor (e.g. ML3)
The picture shows an ML3 soil moisture sensor connected and powered from
Channel 1 and its temperature sensor connected to the resistance channel.
Function Colour
(ML3) DL6 terminal
Power to sensor White V+
Power return Brown 0V
Signal +ve Blue IN+
Signal -ve Black IN-
Temperature + Grey RES IN+
Cable screen Green
Temperature / Resistance channel 7 (e.g. ST1)
The picture shows a 2K thermistor temperature sensor connected
to channel 7. Connect between IN+ and IN-.
Connect any braid or screen to the terminal if required.
Rain gauge / Count channel 8 (e.g. RG1)
Use this channel to monitor slow events such as a rain gauge.
A rain gauge is shown connected to IN+ and IN- terminals.
This channel can be used to initiate dual-rate logging.
Refer to online Help for detailed information.
Note: the polarity of cable connection is not important when
using thermistors or rain gauges.
Relay (alarm) 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.
Function Colour
(SM200) DL6 terminal
Power to sensor Red V+
Signal White IN+
Ground Shield IN-and 0V
5
6
7
8
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Key Features
- 6 Soil Moisture Channels
- Temperature & Rain Gauge Channels
- Versatile Relay Channel
- 16,000 Readings Storage
- PC Connectivity
- Various Sensor Compatibility
- IP67 Rating
Related manuals
Frequently Answers and Questions
What sensors can I use with the DL6?
You can use Profile Probes (PR2/4, PR2/6, PR1/4, PR1/6), SM series sensors (SM150, SM150T, SM200, SM300), ThetaProbe sensors (ML2, ML3), a 2K thermistor for temperature, and a rain gauge (RG1 or RG2).
How do I connect the DL6 to my computer?
Use the supplied DL6-RS232 serial cable to connect the DL6 to your computer’s RS232 port. You can also use a USB-RS232 adapter.
What software do I need to use with the DL6?
You will need DeltaLINK-PC software, which is included on the CD that comes with the DL6. You can also download it from the Delta-T website.
How long does the battery last?
The battery life depends on the logging frequency, but alkaline AA batteries can last up to one year. Lithium batteries can last three to five times longer.
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