73
Reference Manual
00809-0100-4108, Rev BA
Appendix A: Specifications and Reference Data
March 2014
Appendix A: Specifications and Reference Data
A.2.4
Load limitations
Reverse polarity protection is standard. Maximum loop resistance is determined by the power
supply voltage as described by the following equations:
Figure A-1. Maximum loop resistance
Indication
Optional two line LCD display/LOI display.
Zero and span adjustment requirements
Zero and span values can be set anywhere within the range limits stated in
Table 1 on page 72
.
Span must be greater than or equal to the minimum span stated in
Table 1 on page 72
.
Local operator interface
The LOI utilizes a 2 button menu with internal and external configuration buttons. Internal
buttons are always configured for Local Operator Interface. External buttons can be configured
for either LOI, (option code M4), Analog Zero and Span (option code D4) or Digital Zero Trim
(option 0100-4108) for LOI configuration menu.
Current draw
Output Code N:
3 mA
Overpressure limits
Range 1: 120 psig max
All other ranges: two times the URL
Burst pressure
11,000 psi for all ranges
Zero elevation and suppression
Zero can be suppressed between atmosphere for gage transmitters or 0 psia for absolute
transmitters and upper range limit, provided the calibrated span is equal to or greater than the
minimum span, and the upper range value does not exceed the upper range limit.
Load (
o
hm
s)
Operating
Region
Voltage (Vdc)
Max. Loop Resistance = 43.5 (Power Supply Voltage – 10.5)
1387
1000
500
0
10.5
20
30
42.4
The Field communicator requires a minimum loop
resistance of 250
for communication.
