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Instruction Manual
D200124X012
SP GR = specific gravity of the process fluid (for interface level control, use the difference between the specific
gravity of the two fluids; for specific gravity control, use the difference between the upper and lower range
limits of specific gravity).
V
= actual displacer volume, cubic inches listed on the sensor nameplate.
a
V
= standard displacer volume, cubic inches, from table 2.
r
X = torque tube factor (1.0 for standard torque tubes, 2.0 for thin‐wall torque tubes, or 0.5 for heavy‐wall torque
tubes).
2500 Controller or 2500T Transmitter
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 0.2 to 1 bar (3 to
15 psig) or 2.4 bar (35 psig) for a 0.4 to 2 bar (6 to 30 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 the pressure. Tighten the locknut after setting the regulator pressure.
2. Set the process variable to its minimum value.
3. Make sure that the PROPORTIONAL BAND or SPECIFIC GRAVITY control is at the setting determined earlier in this
section. Then, set the RAISE LEVEL or ZERO ADJUSTMENT control at an appropriate value according to table 5. This
table gives recommended settings based on maximum and minimum possible PROPORTIONAL BAND and SPECIFIC
GRAVITY settings. If an intermediate PROPORTIONAL BAND or SPECIFIC GRAVITY setting is necessary, extrapolation
may be used to determine an appropriate RAISE LEVEL or ZERO ADJUSTMENT setting.
Note
The raise level dial does not reflect actual fluid level in the tank or fluid level position on the displacer.
4. The OUTPUT gauge on a 0.2 to 1 bar (3 to 15 psig) range should read 0.2 bar (3 psig) for direct or 1 bar (15 psig) for
reverse action. On a 0.4 to 2 bar (6 to 30 psig) range the OUTPUT gauge should read 0.4 bar (6 psig) for direct or 2
bar (30 psig) for reverse action.
5. On a controller or transmitter with a mechanical indicator assembly, the pointer should be over the LOW point on
the indicator plate. If a slight adjustment is necessary, loosen the side hex clamp nut (key 40, figure 16), shift the
pointer, and retighten the nut.
6. Increase the process variable to the level desired for full output change. The OUTPUT gauge on a 0.2 to 1 bar (3 to
15 psig) range should read 1 bar (15 psig) for direct or 0.2 bar (3 psig) for reverse action. On a 0.4 to 2 bar (6 to 30
psig) range the OUTPUT gauge should read 2 bar (30 psig) for direct or 0.4 bar (6 psig) for reverse action. On a
controller or transmitter with an indicator assembly, the pointer should be over the HIGH point on the indicator
plate; slight plate adjustment may be necessary, as described at the end of step 5.
7. If all prestartup checks are satisfactory, go to the startup procedure. If performance is unsatisfactory, proceed to
the Calibration section.
2500 and 2503 Controllers/Transmitters
June 2017
17
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