EC900 Series Operation Manual
V.4.1
www.systechillinois.com
Page
17
11.0 PROGRAMME CODES
OL
This function returns a two digit code to read and set up the alarm configuration.
The left-hand digit sets whether alarms are high or low. See table below.
DIGIT 1
FUNCTION
ALARM 1
ALARM 2
0
Low
Low
1
High
Low
2
Low
High
3
High
High
The right hand digit sets up whether the alarms are latched or unlatched.
DIGIT 2
FUNCTION
ALARM 1
ALARM 2
0
Unlatched
Unlatched
1
Latched
Unlatched
2
Unlatched
Latched
3
Latched
Latched
With unlatched alarms, the relay and LED will only change over for the duration of the alarm
condition.
For unattended operation it may be required for the operator to know that the analyzer had seen an
alarm condition, even though the measured value was now normal. Latched alarms remain on until
manually or remotely reset. When an alarm is set to Latched the LED will be on when in alarm
condition, should the measured value go into a non-alarm condition, then the LED will flash to show
that it had been in an alarm condition. (Note: the contacts on the relay will remain switched). Simply
pressing the ENTER button will reset the alarm. Also can be remotely reset using a USB Comms
command.
It is possible to delay the operation of the fault relay contacts following detection of an alarm
condition. The LED display will indicate the fault but the fault relay contacts will only operate following
the selected delay time. This feature can prevent spurious machine stoppages by confirming the fault
exists before operating the relay. The USB comms command DELAY = x (where x=0 to 255 in
seconds), sets the delay time. NB Default value is 0.
OPHx
Where x=1, 2, or 3. The level of oxygen corresponding to the maximum level of the analogue
output may be set in this mode. However, certain restrictions apply to different configurations.
not less than 1%
EC9x0
not less than 10ppm.
EC9x1
EC9x3
not less than 1ppm.
EC95x2
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