Instruction Manual
ExTox Control Units Series ET-8D and ET-4D2
Page 22 of 39
Menu Text
Selection
Function
20mA-H(old)
OFF,
ON
This function enables the suppression of alarm triggering
by means of external peripheral devices, for example SPS,
in case the gas detection system is in service mode.
Only valid for types with analogue outputs (ET-8DA and
ET-4DA2): In case this parameter is activated (ON) the
analogue output of the corresponding measuring channel
is frozen (see 5.9) when passing to the service mode (see
4.8.1). Indication of measured values, messages, relay
outputs work as in normal measuring operation. After
leaving the service mode the analogue output is actual-
ised.
In case this parameter is deactivated (OFF), the analogue
output follows the actual measured values even in service
mode.
Standard setting: OFF.
Imin>=4mA
(Imin=4mA)
OFF,
ON
In standard setting OFF the performance of the analogue
output during measuring operation corresponds to the
performance described in Chapter 5.9.
In case the setting ON is selected all output values
< 4 mA are indicated on the output current 4 mA and all
output values > 20 mA are indicated on the output cur-
rent 20 mA. This function in combination with external
controls, which process only input of measured values
4 mA correctly, helps to avoid malfunction. Attention:
negative zero point drift or transmitter fault can not be
recognised any longer by the external control at this out-
put.
4.8.3
Memory Test
Within this menu it is impossible to change any parameters.
4.8.3.1
Series ET-8D
Menu Text
Selection
Function
RAM
-
Indication of the RAM-Test status:
1. Line: Address in Test
2. Line (BAD): 0000 or defective RAM cell
3. Line: -
4. Line: OK or ERROR (Status of Test)
ROM
-
Indication of the ROM-Test status:
1. Line: Address in Test
2. Line (CKS): latest checksum
3. Line: Nominal value of checksum
4. Line: OK or ERROR (Status of Test)
EEPROM
-
Indication of the ROM-Test status: see ROM
