Posted in | Pressure Sensors

Using Keller UK’s Series 33/35 X Ei / 36 XW Ei for Precision Pressure Transmission in Hazardous Environments

The precise pressure transmitters are designed for use in hazardous areas of groups I and II in which the risk of explosion is high. Microcontroller-based electronic evaluation is needed for achieving high accuracy. The transmitters are gauged across the entire temperature and pressure ranges. A mathematical model can be calculated using this measurement data. This model is used for correcting all reproducible errors.

Two compensated temperature ranges are available for industrial transmitters. The level probes can be gauged in the temperature ranging from 0 to 50°C. The interface is used for reading the calculated pressure value. This value can be simultaneously processed as an analog signal. Except in the DIN 43650 plug model, the interface includes an external lead through on all products. The interface is designed as a robust RS485 half-duplex. The CCS30 software is used for recording the measured values. MODBUS RTU and KELLER Bus are available as a communication protocol.


The options available for the precise pressure transmitters are:

  • Mining version labelled with “M” in Type Designation
  • Low voltage version labelled with “LV” in Type Designation
  • Special calculations with pressure and temperatures
  • Different compensated temperature and pressure ranges
  • Different housing-material, oil filling, and pressure thread.


The key specifications of the precise pressure transmitters are given in the following table.

Weight Series 33 X Ei » 140 g,
Series 35 X Ei » 160 g,
Series PD-33 X Ei » 500 g
Material in contact with media Stainless steel 316L (DIN 1.4435)/Viton
Dead volume change < 0.1 mm3
Shock endurance 20 g (11 ms)
Power-ON time 600 ms
Protection IP 65 optional: IP 67 or IP 68 (with cable)
Vibration endurance, acc. to IEC 68-2-6 20 g (5...2000 Hz, max. amplitude ± 3 mm)
CE-Conformity EN 61000-6-2:2005/EN 61000-6-3:2007/ EN 61326-2-3:2006
Storage temperature range -40…+120°C
Load resistance (kW) <(U-10 V)/25 mA (2-wire)
Insulation 10 MW/500 V
Operating temperature range -40…+100 °C for T4
-40… +85 °C for T5
-40… +70 °C for T6

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