Applications

Saltwater intrusion monitoring
Water quality monitoring for agriculture, remediation and correlation of conductivity with salt, TDS, permanganate, nitrate & sulphate
Tidal fluctuations monitoring
Estuary and wetlands monitoring
Leachate monitoring at landfill sites
Aquifer storage and recovery
Network automation monitoring
Waste Water applications
Environmental monitoring
Surface water discharge measurement
Aquifer storage & recovery

Specifications

Dimensions

Length: 223 mm

Diameter: 22 mm

Accuracy

Pressure sensor

0.02 %FS

Accuracy

Temperature sensor

0.5 °C or 0.1 °C

Conductivity

Measuring range

0 μS/cm…200 mS/cm

Selectable Ranges

0,2 / 2 / 20 / 200 mS/cm

Technology

6 titanium electrodes, 4-wire technology

Comp. temp. range

-10…+60 °C

Resolution

< 0.05% of the selected range

Accuracy

< 2.5% of the selected range

Int. measurement rate

1 Hz

Pressure

Standard ranges in bar (1) PR (relative pressure)

0.3

1

3

10

30 ²⁾

PAA (absolute pressure)

–

0.8…2.3

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; bar: ± 1 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 ROB only ⁶⁾, 6 Hz Pt1000 without conductivity, 1 Hz Pt1000 with condutivity

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)
< 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

> 10 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

Clas. 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 1.4425 / 1.4404) or titanium

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
EN 61326-1
EN 61326-2-3

Reverse polarity and overvoltage protection

± 32 VDC power supply and RS485

Standard lightning protection in accordance with EN 61000-4-5

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 CTD Sensor

Specifications

Dimensions

Length: 223 mm

Diameter: 22 mm

Accuracy

Pressure sensor

0.02 %FS

Accuracy

Temperature sensor

0.5 °C or 0.1 °C

Conductivity

Measuring range

0 μS/cm…200 mS/cm

Selectable Ranges

0,2 / 2 / 20 / 200 mS/cm

Technology

6 titanium electrodes, 4-wire technology

Comp. temp. range

-10…+60 °C

Resolution

< 0.05% of the selected range

Accuracy

< 2.5% of the selected range

Int. measurement rate

1 Hz

Pressure

Standard ranges in bar (1) PR (relative pressure)

0.3

1

3

10

30 ²⁾

PAA (absolute pressure)

–

0.8…2.3

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; bar: ± 1 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 ROB only ⁶⁾, 6 Hz Pt1000 without conductivity, 1 Hz Pt1000 with condutivity

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)
< 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

> 10 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

Clas. 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 1.4425 / 1.4404) or titanium

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
EN 61326-1
EN 61326-2-3

Reverse polarity and overvoltage protection

± 32 VDC power supply and RS485

Standard lightning protection in accordance with EN 61000-4-5

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 CTD Sensor

Advantages