Pyromation Series 642 - Manual (Page 29)

Series 642 Trouble-shooting
Pyromation, Inc. 29
Device behavior in event of sensor error
In the event of a warning or error, the "Caution" symbol appears on the display and the error code
is shown. If an error occurs, the bargraph also flashes on the display and only the error code is
displayed and not the measured value. (See also Section 5.2).
8.2.1 Corrosion detection
Sensor connection cable corrosion can lead to false measured value readings. Therefore our unit
offers the possibility to recognize any corrosion before the measured values are affected.
There are 2 different steps selectable dependent on the application requirements:
• off (warning output just before reaching the alarm set point. This allows for preventative
maintenance/trouble-shooting to be done.)
• on (no warning, immediate alarm)
The following table describes how the device behaves when the resistance changes in a sensor
connection line, depending on whether on or off is selected.
The sensor resistance can have an effect on the resistance data in the table. If all the sensor
connection line resistances are increased simultaneously, the values described in the table are
halved. In corrosion detection, it is assumed this is a slow process with a continuous increase in
resistance.
209 Device initialization - 0
+1000 Additional errors active Eliminate error displayed
1) The modes have the following meaning: F: Fault, C: Device in service mode, M: Maintenanca required, S: Out of
specification, *: depends on mode (F or M). See also section 6.4.2 Supported HART
® commands.
If several errors are present, the error with the highest priority is output. Once this error is
eliminated, the next error is output! An offset of 1000 indicates that more than one error is
present.
Corrosion detection only for RTD 4-wire connection.
RTD 1)
1) Pt100 = 100 Ω at 0°C / Pt1000 = 1000 Ω at 0°C
< ≈ 2 kΩ 2 k Ω ≈ < x< ≈ 3 kΩ > ≈ 3 kΩ
off --- WARNING ALARM
on --- ALARM ALARM
TC < ≈ 10 kΩ 10 k Ω ≈ < x< ≈ 15 kΩ > ≈ 15 kΩ
off --- WARNING 1)
1) If the ambient temperature is very high, it is possible to have a measured error 3 times that of the specified value.
ALARM
on --- ALARM ALARM
Fault code Cause Action/cure Mode 1)