Instruction Manual
D200124X012
2500 and 2503 Controllers/Transmitters
June 2017
18
2500S Controller
Note
In the following steps the output pressure can go as high as the controller supply pressure.
1. Turn on the supply pressure and check that the SUPPLY pressure gauge reads 1.4 bar (20 psig) for a 0 to 1.4 bar (0 to
20 psig) output pressure range or 2.4 bar (35 psig) for a 0 to 2.4 bar (0 to 35 psig) output pressure range. If the
pressure is incorrect, loosen the locknut of the 67CFR filter/regulator (figure 9); turn the adjusting screw clockwise
to increase the pressure or counterclockwise to decrease pressure. Tighten the locknut after setting the pressure.
2. Set the process variable to its minimum value.
3. On a controller with a mechanical indicator assembly, the pointer should be over the LOW point on the indicator
Note
Adjustment of the RAISE LEVEL control can set the switching points anywhere within the length of the displacer. Be careful not to
set the switching points so that one is off the displacer.
4. Make sure that the PROPORTIONAL BAND control is at the setting determined in the previous procedures. Set the
RAISE LEVEL control to 0, then set it to 1.0 for a direct‐acting or 4.0 for a reverse‐acting controller.
5. The OUTPUT gauge should read 0 bar (0 psig) for direct or supply pressure for reverse action.
6. Increase the process variable until the OUTPUT gauge changes to either supply pressure for direct or 0 bar (0 psig)
for reverse acting. The process variable should be at the desired high trip value. On a controller with an indicator
assembly, the pointer should be over the HIGH point on the indicator plate; slight adjustment may be necessary, as
described at the end of step 3.
7. Decrease the process variable until the OUTPUT gauge changes to 0 bar (0 psig) for direct or supply pressure for
reverse action (depending on controller range). The process variable should be at the desired low trip value.
8. If all prestartup checks are satisfactory, proceed to the Startup section. If performance is unsatisfactory, proceed to
the Calibration section.
2503 Controller
Note
In the following steps the output pressure can go as high as the controller supply pressure.
Note
Since the 2503 controller has no proportional valve, the differential gap between switching points is adjusted by varying the supply
pressure. This gap can be varied from approximately a 89 mm (3.5 inch) level change at 1 bar (15 psig) to a 152 mm (6.0 inch)
level change at 1.7 bar (25 psig) with a standard volume displacer and a fluid with a specific gravity of 1.0. The gap also varies
inversely according to density; a fluid with 0.8 specific gravity produces a 112 mm (4.4 inch) level change at 1 bar (15 psig) to a
