Metek 920, Operator'S Manual With Essential Health And Safety Requirements

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4-24 | Model 920 Multi-Gas Analyzer
F5 7 MDI
ab
The Microcontroller board’s Digital Input status code, where ‘
a
’ and ‘
b
’ are the status of
the inputs. The analyzer has two external digital inputs that are designed to accept a dry
(potential free) contact closure.
a
(Input 1) = Over-temperature trip signal.
b
(Input 2) = Remote Start of Auto-Zero (Calibration)
0 (external contact is open – normal analyzer operation)
1 (external contact is closed – Auto-Zero is initiated after 5-second delay)
or
Remote Start of Backpurge
0 (external contact is open – Backpurge is initiated)
1 (external contact is closed – normal analyzer operation:
the Flow Control mode changes to automatic Analyzer Control)
Code Contact Status
ab Input 1 Input 2
00 Open Open
01 Open Closed
10 Closed Open
11 Closed Closed
F5 8 LmpP
z
Current lamp pulse (V) for each filter as generated by the Automatic Lamp Control, where
‘
z
’ = 1..6.
1 = Filter 1 4 = Filter 4
2 = Filter 2 5 = Filter 5
3 = Filter 3 6 = Filter 6
F5 9 TCycle
z
Existing temperature control duty cycle for each temperature zone, where ‘
z
’ = 1..5.
1 = slCycle – Sample Line (default = 0 %)
2 = vlCycle – Vent Line (default = 0 %), or
scuCycle – Sample Conditioning Unit, if used (default = 0 %)
3 = n/a – TZone3 – Spare
4 = celCycle – Heater Plate, Oven (default = 100 %)
5 = htrCycle – Analyzer Measuring Cell (default = 100 %)