Instruction Manual
D103032X012
L2 Controller
July 2015
9
5. Check figures 3 and 4 for correct control action and control mode.
6. Adjust the relay adjustment screw (key 49, throttling controller) or the valve assembly (key 51, snap‐acting
Direct‐Acting Throttling Controllers
1. Make certain the Preliminary Checks procedure at the start of this section has been completed.
2. Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the
displacer. For interface applications, completely cover the displacer with the fluid with the lower specific gravity.
The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the
displacer.
3. Adjust the spring adjustment (key 4) until the output pressure is 1 to 2 psig for a 3 to 15 psig output range, or 2 to 4
psig for a 6 to 30 psig output range.
Reverse‐Acting Throttling Controllers
1. Make certain the Preliminary Checks procedure at the start of this section has been completed.
2. Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the
displacer. For interface applications, completely cover the displacer with the fluid with the lower specific gravity.
The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the
displacer.
3. Adjust the spring adjustment (key 4) until the output is 16 to 17 psig for a 3 to 15 psig output range, or 31 to 34
psig for a 6 to 30 psig output range.
Direct‐Acting On/Off and Snap‐Acting Controllers
1. Make certain the Preliminary Checks procedure at the start of this section has been completed.
2. Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the
displacer. For interface applications, completely cover the displacer with the fluid with the lower specific gravity.
The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the
displacer.
3. Adjust the spring adjustment (key 4) until the output pressure is at full supply pressure.
4. Readjust the spring adjustment (key 4) until the output pressure goes to zero psig.
Reverse‐Acting On/Off and Snap‐Acting Controllers
1. Make certain the Preliminary Checks procedure at the start of this section has been completed.
2. Lower the liquid level so that it is below the bottom of the displacer or at the lowest desired operating point on the
displacer. For interface applications, completely cover the displacer with the fluid with the lower specific gravity.
The heavier fluid should be below the bottom of the displacer or at the lowest desired operating point on the
displacer.
3. Adjust the spring adjustment (key 4) until the output pressure goes to zero psig.
4. Readjust the spring adjustment (key 4) until the output pressure goes to full supply pressure.
