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For example MTL products.
Conclusion
: The compliance voltage issue is not present because the Isolator provides all the
necessary voltage.
Conclusion
: The control system must have a compliance voltage equal to or greater than 16.3
V; contact the DCS vendor to verify compliance.
Wire Size and Conduit
Electrical connections are made to the electronics module terminal board as shown in
Figure 32 on page 64. The terminals accept wire sizes up to AWG 14. The SVI II AP is supplied
with two 1/2" NPT conduit entries. M20 adapters are available. Internal and external ground
terminals are provided for use if grounding is required.
NOTE
When an intrinsic safety barrier separates the SVI II AP from the
modem or handheld a HART
®
compliant barrier must be used.
Table 16 Compliance Voltage for Galvanic Isolator with 22 AWG Cable
Voltage at SVI II AP at 20 mA
9.0 V
Drop in 22 AWG cable, 3000’ long (30 Ohms per 1000’)
1.8 V
Required voltage at Isolator
10.8 V
Voltage available from Isolator rated to drive 22 mA into 700 Ohm
1
13.2 V
Voltage required at controller
Not applicable - Isolator
supplies the power
Table 17 Compliance Voltage for No Barrier with HART
®
Filter and Resistor and 18 AWG Cable
Voltage at SVI II AP at 20 mA
9.0 V
Drop in 220 Ohm resistor
4.4 V
Drop in 18 AWG cable, 6000’ long (12 Ohms per 1000’)
0.6 V
Drop in passive
HART
® Filter
2.3 V
Voltage required at controller
16.3 V
Summary of Contents for Masoneilan SVIII AP
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