Envco – Environmental Equipment

The Dry transducer consists of a strain gauge bridge sensing element fitted to a housing. The strain gauge bridge is type 316 Stainless Steel and the housing is a power coated die-cast enclosure. The electrical connection is made via a multicore cable .

The WL2100D output is both SDI-12 and 4-20mA compatible but not at the same time. This allows any SDI-12 or any 4-20mA recording device to communicate with the pressure transducer. The operator may use the SDI-12 to RS232 adaptor cable and then communicate using RS232 from a PC. This special mode is enacted on each command by proceeding each SDI-12 command with an ascii ‘*’ rather than a “break’. When the ascii ‘*’ is detected, all of the timing/break requirements of the SDI-12 are removed. Commands may be typed from a terminal program such as “Hyperterm”.

Operating Range : 100kPa (10 metres), 200kPa 20m), 300kPa (30m)
Overpressure : 1.5 x Range
Supply Voltage : 9V – 30VDC (beyond SDI-12 specification Version 1.2)
Supply Current : 2.0mA nominal in SDI-12 mode

Output Signal : SDI-12 Compliant (Version 1.2) OR 4-20mA (The user selects)
Overall Accuracy : + 0.05% F.S. BSL
Long term stability : Typically + 0.03% FS/annum

Measurement Cycle : Every 4 secs (in 4-20mA mode), When requested (in SDI-12 mode)
Recommended Warm Up Time : 15 secs (after power is first applied)
Operating Temperature range : -20C to +60C (Compensated over this range)

Electrical Connection : 3 Wires +12V Power (red) SDI-12 Data (white) 0V Gnd (black)
Vented Cable : 1 metre of 3 core vented cable
Voltage Spike Protection : Will withstand a 600V voltage spike in accordance with ENV50142 with out damage when applied between excitation lines and case.
Calibration : Over full pressure range.
Insulation : Greater than 100Mohm at 500V d.c.

Dimensions : Length 150mm
Width 60mm
Height 35mm
Mass : 0.45 kg (excluding cable)

Connection as an SDI-12 Transducer
**Note that the WL2100 is supplied set to the 4-20mA mode as default. Therefore to operate in SDI-12 mode with minimal power consumption, the X14 parameter must be set to 0. That is 0X14+0!

Ordering Information
WL2100W - SUBMERSIBLE PRESSURE SENSOR +/- 0.05% FS ACCURACY, ‘FULLY’
TEMPERATURE COMPENSATED, ‘DELRIN’ HOUSING, NICKEL PLATED BRASS
NOSE CONE (DELRIN NOSE CONE AVAILABLE ON REQUEST), OUTPUT SIGNALS
4-20mA OR SDI-12. INCLUDES JUNCTION BOX, COMPLETE WITH SCINTERED
FILTER
RANGES - WATER LEVEL
................................. 0-5M,
................................. 0-10M,
..................................0-15M,
..................................0-20M,
..................................0-30M
OTHER RANGES AVAILABLE UPON REQUEST