Double flanged diaphragm differential pressure transmitter

1, the structure:

Double flange transmitter by differential pressure transmitter, capillary and belt of flange seal diaphragm.Seal diaphragm role is to prevent the pipe in the medium directly into the differential pressure transmitter, it is between the transmitter and by filling of liquid (usually use silicone oil) capillary connected, when diaphragm pressure to produce tiny deformation, deformation or frequency through capillary liquid is passed to the transmitter, the transmitter converts the output signal after processing.

2, appearance inspection:

A, flange check: check the flange connected to the equipment section of the seal are in good condition;Flange and capillary, capillary and itself if there is a connection part of the transmitter and capillary liquid leakage;Flange diaphragm deformation, damage, corrosion, scaling and other adverse conditions.

B, the transmitter inspection: check whether there is any damage, corrosion and other failure on transmitter shell, handle in time when problems found.

3, acceptance:

A, open the cover in the transmitter, check the sealing ring is damaged, if the damage to change in time;Check the circuit boards and other components are in good condition.

B, check the wiring of transmitter are in good condition.

C, disconnect the power supply, wire, insulation resistance checks, with a 500 v megohmmeter check transmitter terminals and shell, the insulation resistance between the resistance value should be greater than 20 m above.

4, transmitter debugging calibration

A, in order to ensure the measuring accuracy of dual flange transmitter transmitter, cannot open capillary, so check to check with flange transmitter;Before installation, can use pneumatic analog signals and calibrate the HART com.

B, zero and span adjustment steps: zero and range of output, so that it is within the scope of permissible error.Continuous pressure, with the range of 0%, 25%, 50%, 75%, 150% of the pressure calibration, when pressure is stable after the record on the standard ammeter displays the current value and do return error checking.If calibration error exceeds permissible error range, should readjust the check.Adjusting method when operated by HART, see HART instructions accordingly.

4, installation:

A, far eastone flange installation:

High and low pressure on both sides of the flange should be installed correctly, can't put wrong;To reduce the influence of environment temperature difference, can be high and low voltage side of capillary bundle together, and fixed to prevent the wind and the influence of vibration and so on (super long section of the capillary volume in fixed together).Be careful not to damage the surface of the liquid membrane.Don't distort, extrusion capillary, don't put too much pressure to it.

B, the installation of transmitter ontology: use the installation bracket, the transmitter ontology is installed on the pipe diameter of 50 mm.Can be installed in horizontal pipe and the vertical piping installation.

5, note:

A, the four bolts fastening measuring capacitance room, connecting the capillary and let room part of the set screw must not loose, liquid sealed to prevent leaks, instrument damage.

B, wiring should avoid large capacity transformer, motor or power with power interference sources;Wiring should disconnect the power supply interface of dustproof plug;Thread department should undertake waterproof processing (waterproof processing is used when no hardening of silicone sealant series);To prevent interference, and other signal cable should avoid power cable through the same cable protection tube;For explosion-proof type instrument, in order to ensure the explosion-proof performance, must be in accordance with the relevant provisions of the wiring.

Ten, the matters needing attention and routine maintenance:

1, before using a new double flange transmitter, to check the flange in the diaphragm liquid such as adequacy of too little, should be returned to the factory maintenance.

2, for never immersed in solution of diaphragm and dry on the sensor for a long time, before use to need to look at is damaged, the purpose is to make after compression, sensor diaphragm rupture, causing the oil mixed with measuring medium.

3, daily use flange removal should be used when not in use cases, avoid by all means will be diaphragm bare outside.

4, need not can do put for a long time, often used to save in the fluid of the electrode to protect, but to soak activated before use.

5, measurement of acid alkali will greatly reduce the electrode life, so if you need frequent measurement of acid alkali resistance of choose and buy special acid alkali diaphragm.

6, membrane cleaning water, water should not be too big, do not use scrubbing brush iron or other metal.

7, flange to should take put down gently, the diaphragm is very fragile, so as not to knock against.

Eleven, selection of coding: