Instruction Manual
ExTox Control Units Series ET-8D and ET-4D2
Page 26 of 39
Relays ET-8D (for ET-4D2 in brackets)
K1 to K24 (K12):
not triggered
Fault Control Unit K25 (K13): closed
Maintenance K26 (K14): closed
5.3
Alarms
Minimum one configured alarm on one channel level is triggered.
If the alarm is configured as latching, it has to be reset manually in case the alarm condition
is no longer available.
Series ET-8D: for that purpose the bar graph and detail indication has to be activated (see
Chapter 3). Now the corresponding channel has to be selected on the display and then the
alarm A1, A2, A3 to be reset by means of the functional keys F3 (<AL) or F4 (AL>). The
alarm can now be cleared by means of the functional key F5 (AQUIT).
Series ET-4D2: for that purpose the bar graph and detail indication has to be activated. Now
the corresponding channel has to be selected on the display by using functional key F1
(<CH>) and then the alarm A1, A2, A3 to be reset by means of the functional key F2
(<AL>). By means of functional key F3 (AQUIT) the alarm can now be cleared.
In case of setting the parameter AQUIT=OFF (see 4.8.7) it is only possible to quit the alarm
if you have released access level 2 or 3 before.
Relays which can be reset - see Chapter 4.2 -, can be quit by pressing the functional key F7
(ET-8D) or F5 (ET-4D2). But the bar graph and detail indication has to be selected. In gen-
eral this function is only used for acoustic messages, such as for example horn, buzzer.
Please see the description in Chapter 4.2 concerning re-triggering in case of an additional
alarm (re-triggering of alarm).
Status-LEDs
Channel Fault (yellow):
off
Alarm 1, 2, 3 (red):
on, for triggered alarms
Operation of Channel:
on, if channel activated
Operation:
on
Fault Control Unit:
off
Display
Bar Graph:
actual value within the range 0 to end value of measuring range
Actual Value:
actual measured value within the range 0 to end value of meas-
uring range
Alarm A1, A2, A3:
1 for triggered alarms, otherwise 0
Fault F:
0
Relays ET-8D (for ET-4D2 in brackets)
K1 to K24 (K12):
triggered, if alarm condition contains activated alarms.
Fault Control Unit K25 (K13): closed
Maintenance K26 (K14): closed
5.4
Under-Scale and Over-Scale of Measuring Range
The measured value is within the range below 0 % and above 100% of the end value of
measuring range. Please note that evaluation of the measured value is only done after zero
point attenuation has been carried out (unless activated according to 4.8.2).
In case of Under-Scale of measuring range measures for correction of Zero Point should be
taken. The deviation value could be evaluated in the menu Analogue Inputs (4.5) by means
of the transmitter input current.
In case of Over-Scale of measuring range due to high gas concentrations corresponding
maintenance measures for the individual transmitter should be taken on short notice, such
as for example calibration and adjustment.