SMAR HART FY500, Установка, эксплуатация и обслуживание

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FY500 HART – Operation, Maintenance, and Installation Manual
6.6
electrical wires enter the I/P converter guides. These guides route the wires to the analog board.
2. Tighten the four M4 x 0.7 hex head screws.
I/P Converter Module
The I/P Converter Module receives a current signal from analog board and converts it to pneumatic
signal to the Diaphragm Module. The analog board determine how much current to send to the coil
for a desired pressure signal. The electromagnet field varies the nozzle-flapper spacing, which
regulates the I/P output pneumatic signal.
Figure 6.3 – I/P Converter Module (Current/Pressure)
Disassembling Nozzle-Flapper with Coil
To disassemble the Nozzle-Flapper with Coil, perform the following steps, refer to Figure 6.3.
1. 1. Remove the two countersunk head screws (Philips) that attach the coil cover to base.
2. Pull the coil cover straight out of base.
3. Remove the flapper assembly. Check for bent flapper, contamination, or dirty air supply. The
flapper can be cleaned with a non-residue cleaner, lint free cloth and soft bristle brush.
4. Remove the nozzle-flapper with coil. Check for open coil (continuity), contamination, or dirty air
supply. Coil resistance should be between 1900 to 2100 ohms.