ATEX Level Sensor | Intrinsically Safe Level Transmitter | Pi99EX

Accurate, Extremely Robust, ATEX Certified and Surge Protected

Pi99EX Intrinsically Safe ATEX Level Sensor

This product has been discontinued

Please use our Water Tank Level Sensor | LMP307 instead

At a Glance

  • Ranges: 0-1mWG up to 0-250mWG
  • Outputs: 4-20mA
  • ATEX Certified: II 1G EEx ia IIC T4…T6
  • Environmental Protection: IP68 to 250 metres
  • Accuracy: <±0.5%/FS (0.25% & 0.1% optional)
  • Guaranteed ATEX Certified Depth & Level Measurement in Hazardous Areas
  • Ideal for use in Fuel & Diesel Oil Applications
  • Corrosion Resistant Titanium Versions for Extreme Aggressive Media 
  • Protected Against Power Surges from Lightning Strikes
  • Fully Submersible & Long-Term Immersion Protected to 250m 


The Pi99EX ATEX level sensor / intrinsically safe level transmitter is designed for use in a wide range of hazardous area applications such as fuel and oil tank measurement, sewage monitoring and leachate level measurement on landfill sites.

The ATEX level sensor’s body is constructed from 316 stainless steel as standard and can also be offered in titanium if the pressure media is particularly aggressive. Polyurethane (PUR) cable is provided as standard and Teflon (PTFE) cable is available as an option if demanded by harsh media.

The ATEX level sensor output is a 2-wire 4-20mA signal which has a surge protection circuit to mitigate the effects of electrical transients caused by nearby lightning strikes and power supply fluctuations.

Product Dimensions

Pi99EX Intrinsically Safe ATEX Level Sensor Outline Drawing

StandardA (mm)B (mm)C (mm)D (mm)Weight (g)
Without Ballast Weight113109on requeston requestapprox. 160
With Ballast Weight200196on requeston requestapprox. 420
Version with Surge (Lightning) ProtectionA (mm)B (mm)C (mm)D (mm)Weight (g)
Without Ballast Weight157153on requeston requestapprox. 200
With Ballast Weight244240on requeston requestapprox. 460

Pi99EX Pressure Range Specifications

Pressure Range0.1 - 0.5>0.5 - 2>2 - 25Bar
Overpressure33 x FS (min. 3 bar)3 x FSbar
Burst Pressure>200>200>200bar
(optional ≤0.25)(optional ≤0.25, ≤0.1)(optional ≤0.25, ≤0.1)
Temperature Error Zero0 to +70˚C0.060.030.015±%FS/˚C
-25 to +85˚C0.080.040.02±%FS/˚C
Temperature Error Span0 to +70˚C0.0150.0150.015±%FS/˚C
-25 to +85˚C0.020.020.02±%FS/˚C
Operating Temperature0 to +70˚C
Storage Temperature-25 to +85˚C
Long-Term Stability (1 year) (typ./max.)<4 mbar<4 mbar<0.2%FS
1) Zero based non-conformity according to DIN 16086, including hysteresis and repeatability.
Electrical Connections4-20mA (2 wire)
Supply Voltage10 - 30 Vdc
Supply Voltage Influence<0.1%FS
Load Resistance Influence<0.1%FS
Pressure Connection, Diaphragm, HousingStainless Steel 1.4435 (316L) or titanium (optional)
Seals (standard)Viton (other materials see ordering information)

Pi99EX EX-Approvals

Type of ProtectionIntrinsic safety II 1G EEx ia IIC T4...T6SEE Certificate SEE 99 ATEX 2640
StandardsEN 50 014: 1992general requirements
EN 50 020:1994intrinsic safety "i"
EN 50 284: 1997special requirements zone 0
Max. values for supply/output circuit30V / 100mA / 1Wzener barrier
Temperature ClassT6T4
Ambient Temperature Ta ˚C-25 to +55-25 to +85
Process Temperature ˚C-25 to +55-25 to +85
Without any information about temperature class the transmitter will be labelled T4.
Ex-Approval for dust on request.

Pi99EX Electromagnet Compatibility

Electromagnety CompabilityNormLevelTypical Interferences
EN 50081-1:1992Generic Emission Standard
EN 55022: 1994Emission, Class B
EN 50082-2: 1995Generic Immunity
EN 61000-4-2: 1995Electrostatic Discharge4kV contact, 8kV air
ENV 50140: 1993Radiated Electro-magnetic Field10V/m, 80-1000 MHz, 80% AM 1kHzCellular Phones, Radio Sets
ENV 50204: 1995Radiated Electro-magnetic Field (GSM)10V/m, 950 MHz, 200 Hz on/offDigital Portable Phones
EN 61000-4-4: 1995Fast Transients (burst)2kVMotors, Valves
ENV 50141: 1993Conducted Radio Frequency10 V, 0.15-80 MHz, 80% AM 1 kHzCellular phones, radio sets
EN 61000-4-5: 1995 2)Surge10 kA (8/20 µs)Lightning Strikes
2) Only with optional surge (lightning) protection

Pi99EX Wiring

White+ve supply
Brown-ve supply

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