MTL Instruments MTL700 Cable Parameters

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Apr 2006
702+ 1 Yes 0.110 2.39 47 0.17 2.2 0.782
706+ 1 Yes 0.083 3.05 56 0.12 4.0 0.65 707+ Both Yes 0.083 3.05 56 0.12 4.0 0.65 708+ 1 Yes 0.083 3.05 56 0.12 4.0 0.65
710P 1 Yes 3.0 0.38 44 4.89 0.22 0.75
715 1 Yes 0.580 1.45 66 0.7 1.4 0.56
715P 1 Yes 0.580 0.33 28 1.04 0.23 1.09
722 1 Yes 0.165 1.45 45 0.2 1.4 0.81
722P 1 Yes 0.165 0.30 32 0.33 0.53 1.18
728 1 Yes 0.083 3.05 56 0.12 4.0 0.65
728P 1 Yes 0.083 1.82 44 0.16 2.86 0.83
751ac 1 Yes 100 3.72 1464 1000 4.5 0.025
2 Yes 100 0.96 558 1000 1.2 0.05
No 100 3.72 732 1000 4.5 0.05
755ac 1 Yes 100 0.46 145 1000 0.4 0.225
2 Yes 100 0.13 69 150 0.1 0.45
No 40 0.41 73 150 0.1 0.45 3 No 40 0.125 48 0.68 4 Yes 40 0.035 31.25 0.92
No 40 0.06 42 0.92
758 1 Yes 11.1 0.070 26 6.0 0.05 1.40
2 Yes 11.1 0.02 10 6.0 0.02 2.80
760ac 1 Yes 3.0 0.91 74 3.0 0.9 0.50
2 Yes 3.0 0.20 27 3.0 0.2 1.00
761ac 1 Yes 4.9 3.72 163 3.1 3.5 0.225
2 Yes 4.9 0.91 62 0.4 1.0 0.45
No 0.31 3.72 81 0.4 1.0 0.45 4 Yes 0.42 0.20 26.39 0.90
No 0.42 0.37 37.78 0.90 6 Yes 0.42 0.085 14.39 1.35
No 0.42 0.13 18.67 1.35
761Pac 2 Yes 0.31 56 306 0.43 14.4 0.115
764± 1 Yes 1.41 240 1000 1.5 200 0.036
2 Yes 1.41 61 360 1.0 60 0.072
764ac 1 Yes 1.41 240 1000 1.5 200 0.036
2 Yes 1.41 61 360 0.18 60 0.072
No 0.125 240 500 0.18 60 0.072
765ac 1 Yes 0.58 1.45 66 0.7 1.3 0.56
2 Yes 0.58 0.32 22 0.7 1.4 1.125
766ac 1 Yes 1.41 5.8 151 1.5 5.6 0.24
2 Yes 1.41 1.47 58 0.18 1.5 0.48
No 0.125 5.8 75 0.18 1.5 0.48
766Pac 2 Yes 1.41 0.34 29 0.22 0.20 0.942
2 Yes 0.58 0.32 22 0.5 0.4 1.125
768 1 Yes 0.165 1.45 45 0.2 1.7 0.81
772ac 1 Yes 0.165 6.77 89 0.2 6.0 0.404
2 Yes 0.165 1.45 34 0.2 1.8 0.808
778ac 1 Yes 0.083 16 107 0.12 14 0.327
2 Yes 0.083 3.05 42 0.12 4.2 0.654
779 1 Yes 0.083 3.05 56 0.12 4.0 0.65 786 1 or 2 Yes 0.083 0.11 500
787 &
787S Both Yes 0.083 3.05 56 0.11 4.0 0.65
787SP 2 Yes 0.083 1.82 44 0.13 2.70 0.835
788 & 788R Both Yes 0.083 0.33 25 0.11 0.5 0.92
791 Both No 0.165 0.30 32 0.24 0.31
*
1.18
707P 2 Yes 0.65 5.65 127 0.45 6.21 1.19 729P 1 Yes 0.65 5.65 127 0.49 6.25 1.19
Number of
single channels
interconnected
within
hazardous area
CABLE PARAMETERS AND PERMITTED COMBINATIONS
Barrier
model
number
MTL
Earth
1
return used?
Maximum permissible cable parameters
Capacitance
µF
Inductance
mH
L/R ratio
µH/
ΩΩ
Capacitance
µF
Matched
2
power
W
(BASEEFA)
Inductance
mH
or
*
L/R = 31µH/Ω
BASEEFA (ATEX) (group IIC)
FM (groups A&B)
BASEEFA (group IIB)
FM (group C)
1x715P Ex92C2425 Yes 0.135 0.23 39.3 0.91 4x764ac 2 x 761ac channels Ex842125 Yes 0.2 0.24 11.6 1.01 2 x 764ac channels 2 x 766ac channels 4 x 761ac channels Ex842125 Yes 0.2 0.2 12.7 0.98 2 x 764ac channels 4x761Pac channels 2x766Pac channels Ex92C2424 Yes 0.18 0.17 18.4 1.17 2 x 764ac channels Ex842128 Yes 0.2 0.28 11 1.04 4 x 766ac channels 758 + 761ac Ex872392 Yes 0.42 0.013 10.5 3.27
4 x 764ac channels Ex842128 Yes 0.6 1.1 32.6 1.12 4 x 766ac channels 2 x 768 channels Ex842114 Yes 0.78 1.8 70 1.62 2 x 768 channels Ex842114 Yes 0.39 1.8 46.6 1.62 Any number of 786 channels 2 x 779 channels Ex842114 Yes 0.39 4.3 83 1.3 2 x 779 channels Ex842114 Yes 0.39 4.3 55.6 1.3 Any number of 786 channels
The tables give the maximum permitted cable parameters (including cable and load) for hazardous-area circuits in group IIC and IIB gases. However, the tables are by no means exhaustive and for full details of other safe combinations, consult either BASEEFA system certificates Ex832469, Ex92C2374 or Ex92C2376 or MTL. The MTL702 is covered by BASEEFA system certificate Ex842308, and the MTL706 by Ex872513. In practice cable parameters rarely present a problem, as all cables normally used for instrument interconnection have L/R ratios below 25µH/Ω and capacitance below 200pF per metre. Note 1 If values are not quoted for when an earth return is not used, those
for
an earth return (‘Yes’ in the table) can be used.
Note 2 The maximum power that can be drawn from the barrier combination under fault conditions. Used for assessing the temperature classification of ‘simple’ hazardous-area apparatus. Note 3 The values of the parameters for Groups IIA and IIB can be found in certificate numbers BAS01ATEX7202 and BAS01ATEX7203.
For FM permitted combinations, refer to MTL document SCI-88 (via FM ref 1H8A1.AX).
BASEEFA
Maximum permissible cable parameters for group IIC (hydrogen)
System
combination
BASEEFA
system
Cert. No.
Capacitance
µF
Earth
1
return used?
Inductance
mH
L/R ratio
µH/
ΩΩ
Matched
2
power
W
(BASEEFA)
or
BASEEFA
Maximum permissible cable parameters for group IIB (not safe for group IIC)
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