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Table of Contents
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Summary of Contents for Delta-T SM150T
- Page 1 SM150T Soil Moisture Sensor Quick Start Guide Version 4.0 Delta-T Devices Ltd...
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Page 2: Sm150T Overview
SM150T overview Manual readings Automatic readings Manual readings with memory with memory HH150 Data Loggers Cables Installation © 2017 Delta-T Devices Ltd Page 2... -
Page 3: Cables And Accessories
Logger Extension cables can be joined up to a maximum length of 100m. Align connectors carefully before pushing parts together. Screw together firmly to ensure the connection is water-tight. Note: HH150 and HH2 meters do not read SM150T temperature. © 2017 Delta-T Devices Ltd Page... -
Page 4: Installation
Note: The SM150T is not suitable for soil surface temperature measurements. For soil temperature near the surface dig a trench and install horizontally as shown below. Cover both SM150T and the first 30cm of cable with at least 5cm of soil. Installing at depth ◼... - Page 5 ▼ Read ◼ Connect the SM150T to the HH150 meter. ◼ With the meter OFF, press the right off – menu button. This wakes and allows you to set the meter to display readings - either as % volumetric water content of Mineral, Peat mix, Coir, Min.
- Page 6 Press to save or Esc to discard the reading. ◼ Remove the SM150T from the soil and move to a new location... ◼ If you have saved data, connect your HH2 to a PC and run HH2Read to retrieve the readings.
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Page 7: Data Loggers
Thermopile HI grey Fit wire link Configure channel 1 as type SM150T and channel 2 as SM150T Temperature. See also DeltaLINK* software sensor Info Panel and Help or the GP2 User Manual. ◼ 2 SM150Ts can connect to each GP1. Each SM150T is wired as a differential, powered sensor.. - Page 8 Cable shield green ◼ In DeltaLINK configure channel 1 - 6 as Moisture Probe SM150T and channel 7 as SM150T Temperature. See also the DL6 Quick Start Guide and the DeltaLINK onlin Help. * Download the latest version (v3.6 or later) of the DeltaLINK logger software from www.delta-t.co.uk...
- Page 9 √ �� = 1.0 + 14.4396�� − 31.2587�� + 49.0575�� − 36.5575�� + 10.7117�� ……….(1) where V is the SM150T output in volts Linearisation table (for use over the full range of SM150T readings) 0.000 1.000...
- Page 10 Air reading ◼ Hold the SM150T in air and away from other objects and take a reading using an HH150 meter, or an HH2 meter or voltmeter or a logger with no more than 5m of cable. In air the reading should be 0 ±4mV...
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Page 11: Specifications
See SM150T User Manual 0-1 V differential 0 to 60% nominal Output signal Output compatible with HH150, HH2, GP1, GP2, DL6, DL2e SM150T must be fully buried to accurately measure soil Temperature temperature Sensor accuracy ±0.5°C over 0-40°C* not including logger or cabling error Output Resistance: 5.8kΩ... -
Page 12: Care And Safety
Do not touch the rods or expose them to other sources of static damage, particularly when powered up. ◼ Keep the SM150T in its protective tube when not in use. ◼ Ensure that the connectors are clean, undamaged and properly aligned before pushing the parts together.