GMC SIRAX PT 602 Mode D'emploi page 25

Measuring
S2 ... S7
range start
value °C
–170 ... –149
–149 ... –119
–119 ... –98
–98 ... –76
–76 ... –58
–58 ... –41
–41 ... –20
–20 ... 0
0 ... 24
24 ... 47
47 ... 64
64 ... 82
82 ... 99
99 ... 116
116 ... 131
131 ... 146
146 ... 163
163 ... 180
180 ... 197
197 ... 209
209 ... 219
219 ... 228
228 ... 240
240 ... 251
251 ... 265
265 ... 275
275 ... 281
281 ... 286
286 ... 291
291 ... 295
10.2.2 Two-wire connection
To determine the switch positions for the desired minimum
value of the measuring range, add the resistances of the
sensor and the leads (R total). If the total lead resistance
L
total) exceeds 25 Ω, subtract 25 Ω.
(R
L
Example 2:
Measuring range 0...100 °C
total) 35 Ω (subtract 25 Ω)
Total lead resistance (R
L
The minimum value is given by sensor + lead resistance:
= 100 Ω + 10 Ω
R
total
Measuring
range start S2 ... S7
value °C
295 ... 301
301 ... 306
306 ... 315
315 ... 326
326 ... 335
335 ... 344
344 ... 350
350 ... 359
359 ... 367
367 ... 375
375 ... 384
384 ... 393
393 ... 400
400 ... 408
408 ... 415
415 ... 422
422 ... 429
429 ... 435
435 ... 443
443 ... 450
450 ... 456
456 ... 462
462 ... 466
466 ... 470
470 ... 476
476 ... 481
481 ... 488
488 ... 494
494 ... 499
499 ... 500
At 26 °C, a Pt 100 has a resistance of 110 Ω. The minimum
value of the measuring range that has to be set on DIP
switches S2...S7 is therefore 26 °C, i.e. the switches positions
are "ON–ON–OFF–OFF–ON–ON".
10.3 Switch positions for setting the span (S8...S13)
Select the desired span in the following table and place
switch S8 in block 1 and switches S9...S13 in block 2 in the
corresponding positions.
Example 3:
Measuring span 616 °C.
Switch positions "ON–ON–ON–OFF–OFF–ON"
Measuring
S8 ... S13
span °C
50 ... 68
... 85
... 101
... 122
... 140
... 150
... 159
... 174
... 193
... 207
...220
... 237
... 254
... 271
... 288
... 303
... 318
... 329
... 339
...353
... 364
... 370
... 376
... 387
... 399
... 408
... 417
... 423
... 428
... 434
... 440
Measuring
S8 ... S13
span °C
... 445
... 450
... 458
... 466
... 477
... 485
... 490
... 494
... 502
... 512
... 519
... 526
... 535
... 544
... 553
... 561
... 570
... 578
... 584
... 589
... 597
... 603
... 606
... 610
... 616
... 623
... 628
... 633
... 640
... 646
... 700
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