Maintenance and Troubleshooting Yamatake Corporation
7-12 ST3000 Smart Transmitter Series 900 Electronic Differential Pressure/Pressure Transmitter
7-3-3 :Washing the Center Body
Introduction
The transmitter and the pipes must be kept clean to maintain its accuracy and achieve
satisfactory performance. Deposits accumulated in the pressure chamber of the trans-
mitter may result in measurement errors.
Rinsing the center body (STD/STG/STA/STC Type)
Rinse the center body using the following procedure:
(1) Remove the hexagon head bolts of the center body and dismount the cover.
(2) Wash the diaphragm and the inner surface of the cover with a solvent and a soft
brush. Take care not to deform or damage the diaphragm.
(3) In reassembling the center body, replace the cover gasket with a new one as neces-
sary.
(4) Tighten the cover bolts at the specified tightening torque. (Refer to "Table 7-1
Cover Bolts / Nuts and Tightening Torque")
Remarks related to cold area
If you stop the operation after measuring liquid that can be frozen (such as water) in a
cold area, drain the liquid from the center body (by loosening the drain plug.)
Maintenance of sensor
The sensor does not need any special routine maintenance/inspection. When the flange
is dismounted for maintenance, wash the diaphragm using a soft brush and solvent.
Work carefully without deforming or damaging the diaphragm.
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