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.

Contact Van Walt

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

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

30 (2)

PAA (absolute pressure)

–

0.8…2.4

0.8…4

0.8…11

0.8…31 (2)

Water column in m approx.

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.

Keller Level & Temperature Sensor

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

30 (2)

PAA (absolute pressure)

–

0.8…2.4

0.8…4

0.8…11

0.8…31 (2)

Water column in m approx.

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

Related Equipment

vanwaltKISS – XS

vanwaltKISS - the Keep It Simple Sensing system is now available with our 16mm narrow diameter Keller sensor to monitor water level and temperature. This makes this logger a unique and accessible solution...

Rain Gauge

The Pronamic Rain Gauge is a meteorological rain and precipitation sensor with a patented unique single spoon tipping bucket making it one of the most accurate and reliable precipitation gauges on the...

Sap Flow Sensor

The Implexx Sap Flow Sensor to monitor sap flow, transpiration and the stem water content in plants. An advanced but easy to use sap flow sensor designed by scientists that uses a thermometric sensor based...

Have a question for Van Walt?

Please complete the form below; a member of our team will contact you shortly

Oops! Something went very wrong. Please refresh and try again...