Tyco MX4428 - Heat Processing; Conversion of Detector Reading to °C

MX4428 MXP Engineering / Technical Manual Document: LT0273
MXP Loop Filter Board
Page 9-4 24 March 2006 Issue 1.5
9.3 HEAT PROCESSING
9.3.1 CONVERSION OF DETECTOR READING TO °C
The temperature readings from the detector (814H or the temperature element of an 814PH
or 814CH) are returned from input AI1 of the MX ASIC. These are converted to °C according
to the following table. This gives the closest temperature for each reading.
Rdg
°C
Rdg
°C
Rdg
°C
Rdg
°C
Rdg
°C
Rdg
°C
Rdg
°C
0 Fault 40 7 80 26 120 42 160 59 200 80 240 120
1 Fault 41 7 81 27 121 42 161 59 201 81 241 120
2 Fault 42 8 82 27 122 43 162 60 202 82 242 120
3 Fault 43 8 83 28 123 43 163 60 203 83 243 120
4 Fault 44 9 84 28 124 44 164 60 204 84 244 120
5 0 45 9 85 28 125 44 165 61 205 85 245 120
6 0 46 10 86 29 126 44 166 61 206 85 246 120
7 0 47 10 87 29 127 45 167 62 207 86 247 120
8 0 48 11 88 30 128 45 168 62 208 87 248 120
9 0 49 12 89 30 129 45 169 63 209 88 249 120
10 0 50 12 90 30 130 46 170 63 210 89 250 120
11 0 51 13 91 31 131 46 171 64 211 90 251 Fault
12 0 52 13 92 31 132 47 172 64 212 90 252 Fault
13 0 53 14 93 32 133 47 173 65 213 91 253 Fault
14 0 54 14 94 32 134 48 174 65 214 92 254 Fault
15 0 55 15 95 32 135 48 175 66 215 93 255 Fault
16 0 56 15 96 33 136 48 176 67 216 94
17 0 57 16 97 33 137 49 177 67 217 95
18 0 58 16 98 34 138 49 178 68 218 95
19 0 59 17 99 34 139 50 179 68 219 97
20 0 60 17 100 34 140 50 180 69 220 98
21 0 61 18 101 35 141 50 181 69 221 99
22 0 62 18 102 35 142 51 182 70 222 100
23 0 63 19 103 35 143 51 183 70 223 102
24 0 64 19 104 36 144 52 184 71 224 103
25 0 65 20 105 36 145 52 185 72 225 104
26 0 66 20 106 37 146 53 186 72 226 105
27 0 67 20 107 37 147 53 187 73 227 107
28 0 68 21 108 37 148 53 188 73 228 108
29 0 69 21 109 38 149 54 189 74 229 109
30 0 70 22 110 38 150 54 190 74 230 110
31 0 71 22 111 39 151 55 191 75 231 112
32 1 72 23 112 39 152 55 192 75 232 114
33 2 73 23 113 39 153 55 193 76 233 115
34 3 74 24 114 40 154 56 194 77 234 117
35 3 75 24 115 40 155 56 195 77 235 119
36 4 76 25 116 40 156 57 196 78 236 120
37 5 77 25 117 41 157 57 197 79 237 120
38 5 78 25 118 41 158 58 198 79 238 120
39 6 79 26 119 42 159 58 199 80 239 120
The temperature is then processed according to
Figure 9.1 to generate the various alarm
and pre-alarm conditions. The RORCV value is also used for enhancement of the smoke or
CO values when this is enabled.