TSH22 Hydrostatic submersible level probe

Accurate and robust immersion water level and temperature sensors with digital output via RS485.

• High level measurement accuracy (0.1% of measuring range)

• Excellent long-term stability

• Very low temperature dependence due to microprocessor signal processing

• Measuring ranges from 0..1 m to 0..10 m above sea level.

• Integrated temperature sensor inside the sensor

• Sensor diameter 22 mm for installation even in narrow boreholes

• Durable stainless steel design of the sensor body

• RS485 communication interface - FINET communication protocols (Modbus RTU)

• Optional connector connection for easy sensor recalibration

• Special semi-permeable filter preventing the penetration of air humidity into the compensating capillary of the sensor

Basic description

The TSH22 water level and temperature pressure sensor is characterized by high measuring accuracy (0.1% FSO) and very low temperature dependence of the measured value.

The base of the sensor is a 19 mm sensor with a stainless steel membrane. The built-in microprocessor compensates for the temperature dependence of the sensor and its possible nonlinearity. The water temperature is measured by a separate sensor located in the sensor body and can be transmitted via the RS485 serial interface together with the level to the connected master system.

The sensors are supplied as standard with the FINET communication protocol, through which it can be easily and quickly connected to all FIEDLER AMS recording units (M4016, H1, H7, Q2, H40, STELA). On request, the sensor can also be supplied with a Modbus RTU interface.

Connection cable termination

The connecting polyurethane cable with a compensating capillary can be loosely terminated with crimped sockets on the individual signal wires, or it can be provided with a robust 7-pin connector at the end.

Konektorové zakončení

1 ... + Unap (6 V DC)
2 ... not used
3 ... not used
4 ... not used
5 ... RS485-B
6 ... RS485-A
7 ... GND

The connector end of the connecting cable has the advantage of quickly disconnecting the sensor from the recording unit in the event of a fault or other damage to the sensor and when recalibrating the sensor. In addition, the connector includes a semi-permeable filter to equalize the atmospheric pressure of the air behind the sensor membrane.

Free cable termination:

Optional accessories

Hanging device
A stainless steel suspension device can be ordered together with the probe, which serves to safely hang the sensor behind the connecting cable to the required position without inadmissible local clamping of the cable and thus possible constriction of the compensating capillary.

Filter  DA284
The loosely terminated cable requires additional treatment of the compensating capillary against the ingress of air humidity into the probe body to the sensitive electronics. Usually this treatment is performed by placing a suitable filter in the wall of the housing of the recording or evaluation unit to which the probe is connected. The filter can also be located in the wall of the connector at the end of the connecting cable.

The air-permeable filter DA284 allows the air pressure inside the wiring box or connector to be equalized with the ambient atmospheric pressure.

However, the semi-permeable membrane of the filter does not allow the penetration of air humidity into the protected space and thus prevents condensation of water vapor inside the device.

Examples of use

• Groundwater level measurement
• Environmental monitoring
• Monitoring of levels and temperatures in open streams
• Basic sensor for warning systems (LWS)
• Measurement of levels in reservoirs and reservoirs
• Level sensing in industrial plants

Documentation: 

Datasheet

TSH22

Download: 

Price list

Price List 2025