Instruction Manual
D200124X012
2500 and 2503 Controllers/Transmitters
June 2017
36
Figure 15. Bourdon Tube‐Flapper Arrangements for Various Actions and Mountings
AC9554
AR8148
BO996-1
CONSTRUCTION
2500
OR 2500T
(INCLUDING
C VERSIONS)
2500S
(INCLUDING
C VERSIONS)
2503
DIRECT ACTING—RIGHT HAND MOUNTING
REVERSE ACTING—LEFT HAND MOUNTING
REVERSE ACTING—RIGHT HAND MOUNTING
DIRECT ACTING—LEFT HAND MOUNTING
Relay Deadband Testing (2500 Controller or 2500T Transmitter Only)
1. Replace the appropriate (proportional or specific gravity) adjustment assembly with the 1/8 NPT pipe plug
according to the Replacing the Proportional Valve section.
2. Turn on the supply pressure and set it to 1.4 to 2.4 bar (20 or 35 psig), depending on the controller/transmitter
operating range.
3. By changing the process variable and adjusting the RAISE LEVEL or ZERO ADJUSTMENT control, set the output
pressure to 1.0 or 2.0 bar (15 or 30 psig). While monitoring the output pressure, slowly change the process variable
until the output pressure just changes, and record the value of the process variable at the detection point.
4. Change the process variable in the opposite direction until the output pressure just changes and again record the
value of the process variable. If the difference between the two recorded values (the deadband) is more than 0.2%
of the maximum displacer length, the relay must be replaced or repaired according to the Changing Relay section.
5. Turn off the supply pressure, remove the pipe plug, and install the appropriate adjustment assembly.
