Connecting T5 And T5X; Spot Readings With The Infield7; Cables; General Requirements - UMS T5 User Manual

Installation

3.4 Connecting T5 and T5x

3.4.1

Spot readings with the INFIELD7

T5 and T5x are fitted with a 4-pin plug. The plug can be connected
directly to an INFIELD7 handheld measuring device for taking spot
readings of the soil water tension. The INFIELD7 displays and stores
the soil water tension readings. Stored readings can be downloaded
with the USB converters tL-8/USB or tL-8/USB-Mini which are
available as accessory.
Remember to put the protective cap back on the plug after taking
spot readings with the INFIELD7.
3.4.2

Cables

Connecting and extension cables are required for connecting T5 and
T5x to a data logger or other data acquisition device. Find cables in
the chapter "Accessories".
Cover plugs with the supplied protective cap if not connected.
3.4.3

General requirements

The pressure transducer is a non-amplified bridge circuit which is
calibrated for 10.6 VDC and requires a stabilized power supply.
Other supply voltages are possible, but the output signal range has
to be recalculated.
In a full-bridge the signal must be measured differentially. This
means do not measure only signal plus against common ground, but
measure the voltage drop between signal minus against common
ground and signal plus against common ground.
The supply voltage has to be constant and stabilized.
The supply voltage must not exceed 18 VDC.
If the Tensiometer is not permanently powered the warm-up
before a measurement should be at least 10 seconds. The 99%
value is reached after 1/100 seconds.
If the Tensiometer is supplied with 10.6 VDC the output signal
range is around 5.3 VDC. A data logger must have the capability
18/48