pg. 50
A:
This can be caused by too fast transducer communication reply. See RS delay command description
page 11.
Q:
Is it necessary to use the ground wire between RS485 communication equipment and transducer?
A:
Yes - both RS232 and RS485 communication requires a 3 wire connection between transducer and
communication equipment.
Calibration and adjustment
Q:
How often does the transducer require calibration or Zero adjustment?
A:
It depends on the application and pressure range but in many applications user adjustment is never
required. Factors that temporally or permanently can influence the measuring performance is contamination,
corrosion, heat and electronic interference.
Q:
How long is the warm up time before obtaining reliable measurements from the transducer?
A:
The small mass of the sensor element ensures short sensor warm up time. Reliable measurements are
typically available within 1 minute.
Q:
Will the transducer retain user calibration after power is shut off?
A:
Yes - all transducer parameters including calibration data are stored internally in the transducer
nonvolatile memory.
Service and repair
Q:
Can the sensor element be changed if contaminated?
A:
No - the sensor elements cannot be changed without changing its measuring electronics. The transducer
flange assembly can be exchanged with the 910 repair kit. Refer to Service and Repair page 52.
Q:
+24 VDC supply voltage has been connected to analog . Is the transducer damaged?
A:
Likely - the analog output is not protected against applying power to the output pin.
Q:
Reverse voltage has been connected to power supply input. Is the transducer damaged?
A:
Not likely – the transducer power supply circuit has reverse voltage and over voltage protection, however,
MKS cannot guarantee that the transducer will not be damaged.
Q:
The status LED is constantly illuminating red?
A:
The red status indicates a defect MicroPirani sensor element most likely damaged by corrosion or
contamination. It can also occur if electronics malfunction. Refer to Service and Repair page 52.
