HPT 500 Differential Pressure Transmitters ATEX CSA IECEx flameproof enclosure

HPT 500 was specially developed to provide a cost-efficient solution for the measurement of differential pressure. A piston movement inside of the device is evaluated by means of a Hall sensor, which enables to determine the occurring differential pressure and makes available an analogue output signal for the integration into a controller. The particularity about this measuring principle is that even with high pressures, e.g. in a 350 bar system, high-precision measurement of very low differential pressures (i.e. <2 bar) is possible.

The differential pressure transmitters with the ignition protection type "flameproof enclosure" combine ATEX, IECEx and CCSAUS approval for the North American market. This allows universal world wide use of the sensor in potentially explosive atmospheres.

Application fields HPT 500 is ideally suited for integration in condition monitoring systems. This enables a continuous tracing on the filter element's contamination degree via intelligent monitoring of the differential pressure at a pressure filter. Consequently, the filter element change can be planned in dependence of its condition and also events of sudden dirt ingress into the system, i.e. due to mechanical defect, can be recognized.

Protection types and applications

CCSAUS Explosion Proof - seal not required

Class I Groups A, B, C, D, T6, T5
Class I Zone 1 AEx db IIC T6, T5 Gb [US] Ex db IIC T6, T5 Gb [C]
Class II Groups E, F, G T110 °C, T120 °C, T130 °C Zone 21 AEx tb IIIC T110 °C, T120 °C, T130 °C Db [US] Ex tb IIIC T110 °C, T120 °C, T130 °C Db [C]
Class III
Type 4

ATEX Flame Proof

I M2 Ex d I Mb
II 2G Ex d IIC T6, T5 Gb
II 2D Ex tb IIIC T110 .. 120 °C Db

IECEx Flame Proof

Ex d I Mb
Ex d IIC T6, T5 Gb
Ex tb IIIC T110 .. 130 °C Db

Functionality

The pressure signal measured by the pressure transmitter is converted into an analogue output signal, proportional with the differential pressure. The range between 0 % and 5 % differential pressure is undefined. This means, if there is no ∆p, the signal can be between 4 mA and 4.8 mA.