Detcon 880S-N4X - Manual (Page 26)

880-N4X
880-N4X Instruction Manual Rev. 1.0 Page 22 of 40
Continue this sequence for the third and fourth gas channels. Channel 5 would be connected to the second
DA4, addressed at 02hex. A matrix table for the Model DA4 modules would look like this:
880A Ch # DA4 # DA4 Hex Address Sensor Position
1 1 01hex 1
2 1 01hex 2
3 1 01hex 3
4 1 01hex 4
5 2 02hex 1
6 2 02hex 2
7 2 02hex 3
8 2 02hex 4
9 3 03hex 1
… … … …
68 18 12hex 1
70 18 12hex 2
71 18 12hex 3
72 18 12hex 4
c) Continue this addressing scheme until all analog sensors have been correctly identified by the 880A.
8) Select “Channel Description”. The keyboard will appear, allowing the input of the Channel Tag Name, or
a brief description of the sensor, up to 20 characters maximum.
9) Select “Gas Type”, and input the gas type of the sensor. (i.e., H2S, LEL, CO2, etc.) Up to 10 characters
maximum.
10) Select “Range” and input the range of the Sensor. (i.e. 25, 50, 100, etc.) Note that the input will not allow
the placement of a decimal point, therefore entries of 10 for a unit of 10ppm or 10% should be entered as
100, and likewise entries of 5 for 5ppm or 5% should be entered as 500. To correctly place the decimal
point in the entry, select the “Decimal Place” box and enter the decimal point placement. (i.e., a “Range”
entry of 100 with a “Decimal Place” of 1 provides a range of 10.0, 10ppm or 10%. Likewise, a “Range”
entry of 500 with a “Decimal Place” of 2 provides a range of 5.00, 5ppm or 5%.)
11) Select “Fault” to set the Fault as latching or non-latching. When de-activated (gray), the ‘N-L’ button will
cause the Fault to reset itself only when the fault condition is cleared or fixed. When activated (blue), the
“Fault” ‘LAT’ button will cause the Fault to be “Latching” and will not allow the Fault to reset until the
fault condition is fixed or cleared and the reset button is pressed.
12) Select “Alarm 1” to set the level at which Alarm 1 will be activated (typically 10% of full range).
13) Select “Alarm 2” and set the level at which Alarm 2 will be activated (typically 20% of full range).
14) Select “Alarm 3” and set the level at which Alarm 2 will be activated (typically 50% of full range).
15) Next to “Alarm 1”, “Alarm 2”, and “Alarm 3”, boxes are two buttons labeled ‘ASC/DES’ and ‘LAT/N-L’
dependent on the current state of the button. When activated, these buttons will turn from gray to blue.
The button labeled ‘ASC/DES’ will set the sensor alarm for ascending (ASC) or descending (DES)
respectively. The button labeled ‘LAT/N-L’ will set the sensor alarm for latching (LAT) or non-latching
(N-L) respectively. Set the appropriate values for each alarm respectively:
a) When activated (blue), the ‘ASC’ button will cause the associated Alarm to activate when the sensor
value rises above the value set for that Alarm (Ascending). When de-activated (gray), the ‘DES’