Installation Manual

ValveWatch II Hardware Installation and Setup Manual
Page 20 of 34
CRANE
Nuclear
Table 5. For the Example provided above, the Maximum Cable Length for both a
Communications Module in RF Mode or DOP Mode and two Sensor Modules attached to the
same cable connected to a SMAR SB-312
5.2 Cable Length Calculations for Sensor Connection
The system is designed for the LDAU and the Sensors to be located in close proximity to one
another. The system is provided with sensor cable predefined at 50 ft. For most applications, the
LDAU will be installed within 15 ft of the Unit Under Test (UUT). If cable lengths longer than 50
ft are expected, the installation will require a cable length calculation for the sensor cables.
Calculation Type Capacitive
Litmus
Calculation
Inductive
Litmus
Calculation
Resistive Litmus
Calculation
Maximum
Length
Allowed
Apparatus
Classification
Length
(ft)
Length
(m)
Length
(ft)
Length
(m)
Length
(ft)
Length
(m)
Length
(m)
EEx ia IIC
Class I Group
A,B
3000 1000 3000 1000 450 150
150
EEx ia IIB
Class I Group C
Class II Group E
15000 5000 15000 5000 450 150
150
EEx ia IIA
Class I Group D
Class II Group
F,G
15000 5000 15000 5000 450 150
150