Honeywell 5704

4-16
MAN0448_Issue 13_01-2010 5704 Control System
005704-M-5001 A03249
CHAPTER 4 - INSTALLATION INSTRUCTIONS
11.2 Sensor Line Resistance
Sensors should be located such that the line resistance of cable does
not exceed the maximum permitted. The table below gives a quick guide
to themaximum cable lengths permitted forspecic sensors, when
connectedbystrandedcopperconductorcablesofvarioussizestoa
System 57 running at the minimum dc input voltage.
Maximum Cable Length (m)
Device or Sensor Type Conductor Cross Sectional Area
AWG 21 19 18 16 14
  mm˝ 0.50 0.75 1.00 1.50 2.50
704/705 500 750 1000 1500 2500
780 (at 200mA bridge current)
500 750 1000 1500 2500
811 5600 8400 11200 16800 28000
910 (Single pair at 200mA) 480 720 960 1400 2400
910 (2 pair at 200mA) 230 340 460 690 1100
911 5600 8400 11200 16800 28000
SensePoint Flam. LEL/ppm 500 750 1000 1500 2500
SensePoint Toxic 3200 4800 6400 9600 16000
SignalPoint Flamable 500 750 1000 1500 2500
SignalPoint Toxic 2000 3000 4000 6000 10000
Digi-Cat 400 570 800 1150 1850
Digi-Chem 1000 1500 2000 3100 4800
Digi-Ana 1000 1500 2000 3100 4800
Digi-Optima 180 260 360 540 860
Life Line 3200 4600 6500 9750 15000
Searchline
(minimum dc supply 21V) 60 90 120 180 300
Searchpoint 500 32 48 64 96 160
Searchpoint OPTIMA
(minimum dc supply 19V) 180 270 360 540 900
Series 2000 Flammable 450 670 900 1300 2200
Series 2000 Toxic 1600 2400 3200 4800 8000
Searchline Excel Receiver
(Minimum dc supply 21V) 90 135 179 271 449
Searchline Excel Transmitter
(S/R) (Minimum dc supply 21V) 141 211 282 425 704
Searchline Excel Transmitter
(L/R) (Minimum dc supply 21V) 94 141 188 283 998
Searchline Excel Cross Duct
Transceiver assembly
(Minimum dc supply 21V) 55 82 109 165 274
Searchpoint Optima Plus 159 237 315 476 787
Apex - Toxic 180 270 360 540 900
Apex - Combustible/Thick Film 130 195 260 390 650
Opus/LLII - Toxic 300 450 600 900 1500
Opus/LLII - Combustible 250 375 500 750 1250
The gures in the table above provide a useful reference guide to
maximum cable lengths, however, in many circumstances longer cable
runs can be used. eg. Where the dc input voltage is higher than the
minimum. In these circumstances a more detailed analysis is required
to determine maximum line resistance.
WARNING
Itisrequiredthatvericationbytestingthatcablefaults(opencircuitand
short circuit) at the transmitter’s side are correctly detected by the control
card. The control card shall indicate ER81, ER87 or ER88 in this case.