Keller Level & Temperature Sensor

Keller PR-36 XiW Sensor for groundwater level monitoring. Accurate level and temperature measurements.  A Swiss made, latest-generation sensor, so it is extremely precise. Because we offer this sensor with 30 m of Kevlar Cable and a Modbus Interface it is compatible with Van Walt’s range of telemetry options. Accurate and reliable from Europe’s leading manufacturer of pressure transducers.

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Advantages

  • Compatible with Van Walt telemetry (vanwaltCONNECT; vanwaltDataHub & vanwaltDataSlave)
  • Supplied with 30 m of vented Kevlar Cable so no barometric compensation required
  • Available from stock with Modbus connection
  • High accuracy
  • Mathematical compensation of nonlinearities and temperature dependencies
  • Robust stainless-steel housing (titanium or Hastelloy also available)
  • Level measuring ranges from 0…3 m to 0…300 m
  • Ultra-high long-term stability
  • Devices can be connected together into a network system
  • Un-rivalled quality and performance that is synonymous with Swiss engineering.

Keller Level & Temperature Sensor

Call Van Walt
+44 (0) 1428 661 660 Call Van Walt
+64 (0)3443 5326 Call Van Walt
+27 21 518 1347

Keller Level & Temperature Sensor Equipment Options:

Applications

  • Waste Water applications
  • Long term water level & temperature monitoring
  • Groundwater monitoring projects & site assessments
  • Tidal studies
  • Groundwater monitoring network automation
  • Watershed, drainage basin and recharge areas
  • Stream gauging, lake levels and reservoirs
  • Wetlands and storm water run-off monitoring
  • Environmental monitoring
  • Surface water discharge measurement
  • Aquifer level monitoring
  • Aquifer storage & recovery

Specifications

Specifications
Dimensions
Length: 90 mm
Diameter: 22 mm
Accuracy
Pressure Sensor
0.05 %FS
Accuracy
Temperature Sensor
0.5 °C or 0.1 °C
Pressure
PR (relative pressure)
0.3
1
3
10
30 (2)
PAA (absolute pressure)
–
0.8…2.4
0.8…4
0.8…11
0.8…31 (2)
Water column in m approx.
3
10
30
100
300
Overload Resistance
max. 300%
Technology
oil-filled, insulated, piezo resistive pressure transducer in a metallic casing
Resolution
typ. 5 ppm (corresponds to 0.0005 %FS)
Accuracy 3) 5)
± 0.02 %FS max.
(0.3 bar Range: ± 0.04 %FS)
Comp. temp. range
0…50 °C
Total error band 4) 5)
± 0.1 %FS max.
(0.3 bar Range: ± 0.2 %FS)
Operating temperature 5)
-20…80 °C
Int. measuring rate (adjustable)
120, 240 (default), 480 Hz
Long-term stability
ranges > 1 bar: ± 0.1 %FS max.
ranges <e; 1 bar: ± mbar max.
Degree of dependency on location
± 1.5 mbar max
Temperature
Measuring range
-10…80 °C
Technology
Silicon (pressure measuring bridge, TOB6)), optional Pt1000
Resolution
< 0.01 °C
Accuracy
silicon sensor: typ. ± 0.3 °C
Pt1000 sensor: ± 0.1 °C max.
Int. measurement rate
12 Hz TOB only 6), 6 Hz Pt1000 without conductivity, 1 Hz Pt1000 with conductivity
Electrical Data (RS485)
Supply voltage
with extended lightning protection
3.2…32 VDC
4.5…32 VDC
Power consumption
without conductivity
with conductivity
< 6 mA (active) 7), < 14 mA (active) 7)
Start-up time P1, TOB1
P1, T, Con
< 300 ms
3 s typ.,6 s max
Insulation GND-CASE
> 10 MΩ @ 300 V
Endurance
> mio. pressure cycles
0…100 %FS @ 25 °C
Storage temperature
-20…+80 °C
Digital Interface (RS485)
Communication protocol
Modbus RTU
KELLER Bus
Baud rate
9600*, 115,200 bit/s
Identification
Class. Group: 5.21
Units of pressure
bar
Units of temperature
°C
Unit of conductivity
mS/cm
Mechanical Data
Weight
ca. 150 g excl. cable (CTD ca. 300 g)
Housing material
stainless steel 316L (DIN 1.4435 / 1.4404)
Cable material
PR: polyethylene (PE)
PAA: polyolefin (PE based)
Other materials
seals: Viton®, protective cap: POM
conductivity (additional): titanium, PEEK
Standards & Protection
CE-Conformity (EMC)
EN 61000-6-1 to 6-4
EN61326-1
EN61326-2-3
Reverse polarity and overvoltage protection
± 32 VDC power supply and RS485
Standard lightning protection in accordance with EN61000-4-5
Line-Line: 50 A @ 8/20 μs
Line-CASE: 200 A @ 8/20 μs
Degree of protection
IP68
Notes

1) Pressure range buffer: pressures can be measured at up to 10% outside the pressure range either way, in which case “+Inf” or “-Inf”, as appropriate, will be displayed.

2) Subconn® connectors increase the pressure range to above 30 bar Pressure ranges > 21 bar are only possible without a conductivity sensor.

3) Linearity (best straight line), hysteresis and repeatability.

4) Accuracy and temperature error within the compensated temperature range.

5) Outside the compensated temperature range up to the limits of the operating temperature range, the deviation will be up to twice the value displayed.

6) Temperature information for the pressure sensor (TOB: top of bridge)

7) Power consumption without communication. During the response time (9 ms @ 9600 Baud, 1 ms @ 115’200 Baud), an extra 1…40 mA depending on the line termination.

Resources

Video

Manuals & Downloads

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+44 (0) 1428 661 660 +64 (0)3443 5326 +27 21 518 1347