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The device must only be used in accordance with these operating instructions for mechanical installation, electrical con-
nection, environmental conditions and use in order
to maintain the declared SIL. The sensors must be powered by non-distributed networks and in any case with a length
of less than 30 m.
Periodic maintenance to carry-out in order to guarantee the justified exclusion of failures are:
- Visual inspection of the status of the electrical and mechanical connections.
The maintenance is designed to evaluate possible problems due to situations of incorrect mounting endured over time
or particular aggressiveness of the material processed.
Frequency: every two years
Check obstruction of the channel under pressure
- The maintenance has the purpose to verify that there are no occlusion of the pressure channel, which would lead to
malfunctioning.
The inspection is visual, after removing the probe from the process seat.
Frequency: every year.
Testing the sensor calibration
- The test is intended to check the correctness of the transduction curve of the sensor. It's done by applying known
pressure points to the transducer and checking the output values of the probe.
Frequency: every four years.
The response time to the pressure transduction is equal to 1 ms
The KH Series pressure sensors in the case of some specific anomalies provide output saturation (positive HIGH or
negative LOW).
The table 1 indicates the detected failures, their effect on the electrical output, and the recovery mode of the device.
Table 1: failures, effects on the outputs
Failure
Power supply cable broken
Sensor not connected
Power supply broken
Broken bridge
(*) variable according to the type of failure
85198C_Manual of Electrical Installation for Pressure Probes KH-SIL2-Mobyle-series_08-2028_ENG
5.2 Restrictions of use
5.3 Maintenance and periodic inspections
5.4 Indication of response time
5.5 Indications and alarms
Current
output
FS<= 6V
LOW < 3.8mA
LOW < 3.8mA
LOW < 3.8mA
*LOW < 3.8mA
*HIGH > 22mA
*HIGH > 7 V
Voltage
output
FS > 6V
LOW < 0.05 V
LOW < 0.05 V
LOW < 0.05 V
*LOW < 0.05 V
*HIGH > 11.5 V
Ratiometric
Power supply 5V
LOW < 0.25 V
LOW < 0.25 V
LOW < 0.25 V
*LOW < 0.25 V
*HIGH > 4.75 V
7
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