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7.6 Calibration Procedure of the Electrical Devices
7.6.1 Procedure A
• Remove the resistance thermometer from the machine.
• Check it with a calibrated oven or send it to an approved laboratory for inspection.
• Reassemble the resistance thermometer on the machine.
7.6.2 Procedure B
• Remove the pressure switch from the machine.
• Compare it with another calibrated pressure switch or send it to an approved laborat-
ory for inspection.
It must trip when the pressure reaches the prescribed trip value.
• Reassemble the pressure switch on the machine.
7.6.3 Procedure C
• Remove the pressure transmitter from the machine.
• Compare it with another calibrated pressure transmitter or send it to an approved
laboratory for inspection.
• Reassemble the pressure transmitter on the machine.
7.6.4 Procedure D
• Remove the vibration sensor from the machine.
• Control it with a calibration system or send it to:
Monitran Ltd
33 Hazlemere Road
Penn
HP10 8AD
UK
[email protected]
Use an Analog Current Loop Simulator and Tester 4-20mA to test the remaining control
loop.
Compare and record the trip value.
• Reassemble the vibration sensor on the machine (8Nm).
7.6.5 Procedure E
• Check that the flow switch changes state when the ball of the flowmeter is passing.
It is not necessary to disassemble the flowmeter or its switch.
7.6.6 Procedure F
• Check that the level switch changes state by using the test magnet.
• Hold the test magnet against the “target” marking.
• Make sure that the switching status is changed.
• Read the instruction manual of the level switch for more information.
Summary of Contents for COBRA ATEX NC 0100-0300 B
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