Instruction Manual
D101728X012
3710 and 3720 Positioners
September 2017
44
Testing the 3722 Converter Module
Check the operation of the converter module by installing a pressure gauge in the instrument output port in the
converter housing.
supply pressure and a 4 to 20 mA DC input signal.
2. Apply a 1.4 bar (20 psig) supply pressure. The instrument output pressure at a 4 mA DC input signal should be 0.16
to 0.24 bar (2.3 to 3.5 psig). The pressure output at a 20 mA dc input signal should be 0.97 to 1.07 bar (14.0 to 15.5
psig).
3. If necessary, replace the converter module and test the new module. Then, calibrate the pneumatic portion of the
positioner by performing the procedures in the Calibration section of this manual. Do not attempt to calibrate the
converter module. There are no converter module adjustments.
Parts Ordering
or Local Business Partner about this equipment, be sure to
mention the positioner serial number.
WARNING
Use only genuine Fisher replacement parts. Components that are not supplied by Emerson Automation Solutions should
not, under any circumstances, be used in any Fisher instrument. Use of components not supplied by Emerson may void
your warranty, might adversely affect the performance of the instrument, and could cause personal injury or property
damage.
Parts Kits
Description
Part Number
Pneumatic Positioner Elastomers Kit
Contains keys 2, 17, 19, 22, 29,
30B, 31, 59
nitrile
R3710X00012
EPDM
R3710X00022
Electro‐Pneumatic Converter Kit
Contains keys 76, 77, 79, 85, 88
nitrile
R3722X00012
EPDM
R3722X00022
Parts List
Note
Contact your
or Local Business Partner for Part
Ordering information.