Tyco MX4428 technical manual Heat Processing, Conversion of Detector Reading to C

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

9.3.1CONVERSION 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.

Page 9-4 24 March 2006 Issue 1.5