CO Processing, Enhancement, Eeprom

MX4428 MXP Engineering / Technical Manual		Document: LT0273
MXP Loop Filter Board

9.5	CO PROCESSING

9.5.1CALIBRATION AND TEMPERATURE COMPENSATION

The CO reading of the detector is returned as input AI0 of the device ASIC. The CO readings are adjusted depending on a calibration factor set at the factory and stored in

EEPROM.

9.5.2“ENHANCEMENT”

Figure 9.3 shows the amount by which CO readings are increased depending on the temperature rate of rise. (This is the same for the CO detector as the Photo detector.)

The default enhancement multiplier parameter is 12. The graph (Figure 9.3) shows the effect of this factor and also the effect of an alternative parameter of 6.

If enhancement is disabled, (or less efficiently if the enhancement multiplier parameter is set to 0) the multiplier is exactly 1.

9.5.3CO PROCESSING

Subtractor Comparator

Calibration

Subtractor

Raw

Value +

Exponential

Adder Filter

Enhancement Factor derived from Heat RORCV (1 if no enhancement)

Subtractor

+	+	PreAlarm
-	-

PreAlarm Threshold

CVEnh (CV to FIP)

Slope

AdderLimiter

Constant stored in detector eeprom

CO Filter	Multiplier	CO Step Limit
Divisor
		SLV
TV = Tracked Value = Zero CO Value
	Subtractor	Comparator
	+	+	Alarm
	+	+
	-	-

Alarm Threshold

Figure 9.5 CO Processing Diagram

Page 9-8

24 March 2006

Issue 1.5

MX4428 specifications

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Tyco MX4428 CO Processing, Calibration and Temperature Compensation, Enhancement, Eeprom

Models: MX4428

CO PROCESSING