Ne21 And Ne43 Compatibility Specifications - gefran HMF Series Instruction Manual

Application for use relevant to the designated category
The HMF, HMF P/S, HWF and HWF P/S series transducer can be used in a pressure sensing chain in order to
stop any pressure generating system if a pressure threshold is overcome.
The threshold is only set in factory and can't be changed by the user.
In diagram "A" (Fig. 10.2) is shown a possible application: the sensor detects the pressure and gives in output an
analog electrical value proportional to the pressure itself; SRP/CS compares the signal with its internal alarm threshold:
if the threshold is exceeded the SRP/CS will stop the pressure generation systems.
The HMF, HMF P/S, HWF and HWF P/S series are fully compatible with the NE21 and NE43 Namur recommendations
(refer to Tab. 10.4).
Broken power cable
Sensor not connected
Broken power supply
Broken chip
Pin detachment
Pressure over 200% of the span vs factory zero @ RT
Preload loss exceeds -30 % of span vs factory zero @ RT
Error on primary or first amplification stage
Overvoltage
Undervoltage
Error in the program sequence
Overheating of the electronics
Error RAM
Error ROM
Error CPU
Analog output error
(*) In such conditions the Alarm Type can be programmed via HART at ≥ 21 mA.
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Fig� 10�2� Application diagram A - Current 2-wires output
10�1� NE21 and NE43 compatibility specifications
Failure
Tab� 10�4� NAMUR NE21 and NE43: Analog output value.
HMF, HMF P/S, HWF, HWF P/S
Electrical output ≤ 3.6 mA
Electrical output ≤ 3.6 mA
Electrical output ≤ 3.6 mA
Electrical output ≥ 21 mA
Electrical output ≥ 21 mA
Electrical output ≥ 21 mA
Electrical output ≥ 21 mA
Electrical output ≥ 21 mA
Electrical output ≤ 3.6 mA (*)
Electrical output ≤ 3.6 mA (*)
Electrical output ≤ 3.6 mA (*)
Electrical output ≤ 3.6 mA (*)
Electrical output ≤ 3.6 mA
Electrical output ≤ 3.6 mA
Electrical output ≤ 3.6 mA
Electrical output ≤ 3.6 mA
80636B_MAN_HMF - HWF_05-2022_ENG