CleaverBrooks ADAC 1000, Operation Manual

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Chapter 2 — System Components
2-10 Part No. 750-386
NOTE: The float must be installed before the transmitter or level
indicator will work. The float is laser etched with the word “TOP”
and an arrow indicating the direction the float must be inserted into
the chamber.
As with any level control device, regular maintenance to blow down
and inspect the inner chamber should be performed to ensure
proper operation.
2.3.5 - Differential Pressure Level Transmitter
Commissioning
This procedure applies only to differential pressure transmitters
used for level measurement on pressurized closed pressure vessels
(boiler drum or deaerator).
1. Make sure that power to the transmitter is “OFF”.
2. With stop valves on the pressure vessel side closed, fill the impulse line
going to the low-pressure side of transmitter with distilled water.
3. Open low and high pressure valves on the vessel side to fill impulse
lines with water.
4. Slowly open the high pressure valve on the transmitter side (part of 3-
valve manifold) to fill the transmitter pressure-detector section with
water.
5. Slowly open the low pressure valve on the transmitter side (part of 3-
valve manifold) to fill the transmitter pressure-detector section with
water.
6. Check that there are no leaks in the impulse piping, 3-valve manifold,
transmitter or other components.
7. To vent air from the impulse lines and transmitter, slowly open vent
plug on the transmitter (one side at the time) until only liquid is coming
from the plug orifice. Tighten vent plugs.
8. Turn on power to the transmitter.
9. Confirm transmitter operation.
Setting Zero and Span - Rosemount 3051 Transmitter
1. On the top of the transmitter head locate Zero (Z) and Span (S) but-
tons.
2. Fill reference leg (low pressure side) with water.
3. On the three valve bypass manifold open high pressure side valve,
close low pressure side valve and open bypass valve.
4. Loosen bleed nut on the high pressure side and wait until only water is
coming out (no air). Repeat for the low pressure side.
5. Close bypass valve and open low pressure side valve.
6. Fill deaerator with water to the bottom of the gauge glass and press
Zero button. Hold Zero button for at least 2 seconds.
7. Fill deaerator with water to the top of the gauge glass and press Span
button. Hold Span button for at least 2 seconds.
8. Measure the length of the gauge glass.
9. On the PanelView screen for transmitter calibration. Zero = 0. Span =
Length of the gauge glass.
Figure 2-13 Transmitter