Closed Loop Connection - GE DewPro MMY 245 Installation And Operation Manual

DewPro MMY245 Installation and Operation Manual
Figure 10
Care should be taken to connect the MMY 245 to systems within the rated pressure range of vacuum to 150
psig. If the process pressure is greater than 150 psig, a pressure regulator should be used to reduce the
pressure. Although the MMY 245 can operate at inlet pressures of up to 150 psig, the MMY 30 transmitter
is frequently fitted with an orifice either at the inlet or outlet that will drop the pressure. For convenience,
the MMY 245 can be set to correct for this pressure differential and produce the proper validation. If the
orifice is at the outlet as in M/N MMY 30R1A1A, the setting for the pressure compensation in the MMY
245 must be set for proper pressure compensation. In this case, the sample pressure at the transmitter
should be measured and noted for proper configuration of the validator. If the orifice is at the inlet as in
M/N MMY 30R1B1A, there is no need to alter the setting for the pressure compensation in the MMY 245.
Once the sample connection has been made, the unit should be allowed to purge for at least 10 minutes to
provide a true sample to the validator. After purging the system, the selected calibration may proceed by
setting the MMY 245 to begin the validation.

4.3.4 Closed Loop Connection

A closed loop connection, (see Figure 11), is also an option for the MMY 245. This method requires the
proper valving to break the existing closed loop to insert the MMY245 in the loop. The valves should be
located on the outlet of the on-line transmitter to provide for insertion of the MMY 245 into the loop. The
valves should be closed and the sample tubing between them should be in a "U" shape to allow easy
removal. Removing this "U" tube and connecting the inlet and outlet connections of the validator to these
valves will complete the process connections.
GE General Eastern
24