Document: LT0273

MX4428 MXP Engineering / Technical Manual

 

Device Processing

 

 

9.6

IONISATION PROCESSING

The smoke reading of the detector is returned in two parts as inputs AI0 and AI1 of the device ASIC. In the MXP the average value of AI0 and AI1 is used for all calculations, so that all returned values to the MX4428 lie within the range of 0 – 255. (Note that TEPG literature refers to the sum of the two inputs.)

The processing is shown in Figure 9.6. The tracked value is initialised by setting it to a high value (100) when the MXP or detector powers up, and allowing the tracked value to increment / decrement by 1 for each of the first 4 minutes.

Subtractor Comparator

+

+

PreAlarm

- -

PreAlarm Threshold

 

Exponential

 

Filter

Raw

CV

Value

 

Filter Divisor

Slope

 

 

 

 

Limiter

 

Subtractor

Comparator

 

 

 

 

 

SLV

+

+

Alarm

 

 

 

 

 

 

 

-

-

 

 

 

 

 

 

Step Limit

Alarm Threshold

TV = Tracked Value

= Assumed Clean Air Value

Very Slow Slope Limiter

(1 step per Tracking Interval)

Figure 9.6 Ionisation Detector Processing

Issue 1.5

24 March 2006

Page 9-9

Page 118 Page 120
Page 119
Image 119
Tyco MX4428 technical manual Ionisation Processing, Ionisation Detector Processing
Page 118 Page 120

MX4428 specifications

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