Changing The 4-20 Ma Current Loop Mode - Endress+Hauser SS2100i-2 Operating Instructions Manual

SS2100i-2 TDLAS Gas Analyzer
supply. Coated tubing is not needed for instrument air, nitrogen, or sample return. If the analyzer comes with a
factory installed sample system, consult the system drawings for tubing sizes and attachment points.
NOTICE
 For systems with integral sample conditioning systems, refer to the SCS manual.
4.15.1 To connect the sample supply and return lines
Connect the supply and return tubes to the analyzer using the stainless steel compression-type fittings provided.
1.
Tighten all new fittings 1 ¼ turns with a wrench from finger tight. For connections with previously swaged
2.
ferrules, thread the nut to the previously pulled up position, then tighten slightly with a wrench. Secure tubing to
appropriate structural supports as required.
Check all connections for gas leaks. Endress+Hauser recommends using a liquid leak detector.
3.
CAUTION
 Do not exceed 10 PSIG (0.7 barg) in sample cell. Damage to cell may result.
4.16

Changing the 4-20 mA current loop mode

CAUTION
 Changing the current loop mode may negate specific hazardous area certifications.
By default, the 4-20 mA current loop output is factory set to source current. In some instances, it may be necessary to
change the 4-20 mA current loop output in the field from source to sink. This work should be performed by
personnel qualified in electronics assembly.
WARNING
 Hazardous voltage and risk of electric shock. Turn off and lock out system power before opening the electronics
enclosure and servicing.
4.16.1 To change the 4-20 mA board from source to sink
Disconnect power to the analyzer.
1.
Open the analyzer enclosure cover according to the procedure under To open an analyzer enclosure cover →
2.
gain access to the electronics panel.
Locate the 4-20 mA current loop board in the upper middle of the electronics panel, as shown in Fig 7 →
3.
Unscrew the screws holding the retaining bracket and remove the retaining bracket.
4.
Gently pull the 4-20 mA current loop board up off the backplane into which it is plugged.
5.
Move the jumper (JMP1) connecting the center pin to pin A, shown in the figure below, to connect the center pin
6.
with pin P.
1
2
1. Zero (4 mA) potentiometer adjustment
2. Span (20 mA) potentiometer adjustment
Endress+Hauser
Fig 24. Analyzer 4-20 mA board
Operating Instructions
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