Azbil PTG71, User Manual

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Azbil Corporation Maintenance and troubleshooting
Model PTG71 / 72 - Smart Pressure Transmitter 5-1
Chapter 5 : Maintenance and troubleshooting
Maintenance precautions
WARNING
• If the Transmitter must be disconnected from the process for the maintenance
purposes, careful attention must be paid to the possible residual process and
pressure. Personal injury may result from the generation of gas or release of liquid
process.
• When draining the process from the Transmitter through a vent hole, check the
direction of the gas or liquid being drained. This precaution is to protect you from
possible scalding or inhaling harmful fume due to exposure to the process being
drained.
• Do not open the housing cover while in operation in explosion-proof area.
Opening the cover may induce an explosion.
• This product is manufactured and shipped under Azbil Corporation's rigorous
quality control system. Do not modify the product. Doing so will cause critical
damage to the product.
Maintenance
Check the following on periodic basis:
• Has the housing, cover or grounding cable been damaged?
• Are the grounding cable, cover or housing-detent screws loose?
• Are the terminal screws loose?
•
Is there any deterioration of the O-rings fitted to the set-screws holding the
housing in position?
• Is there any leakage from the connection pipes?
Troubleshooting
If the product does not function properly, release the process gas or liquid from the
product, leave it open to the atmosphere, and check the following items:
• Are there any loose or broken wires?
• Are the readings correct for power source voltage and load resistance?
• Is there any sediments or foreign objects at the wetted part?
• Is there dirt or debris present, clogging the connecting pipe? Is the gate valve
fully open?