TEKTROL TEK-B AR 3120B, Instruction Manual

Page: 30 / 34

Instruction Manual
Tek-Bar 3120B
www.tek-trol.com
28
Technology Solutions
6 Maintenance
This section covers maintenance techniques and guidelines.
WARNING
Explosion can result into a serious injury or death.
•
Do not remove the transmitter cover in explosive environments when the circuit is live.
•
After disconnecting power wait for a minute to allow the circuit and enclosure to cool
down before opening.
• Avoid direct contact with the leads and terminals. High voltage on leads can cause
electrical shock.
• Ensure that the transmitter casings are sealed when the assembly is in operating
condition.
• Only trained and qualified personnel may undertake start-up and maintenance activities.
6.1 Hardware Maintenance
Perform maintenance task at regular intervals. Set the maintenance schedule in advance and
maintain a logbook to note maintenance activity details. Maintenance schedule depends on the
system, installation conditions, working medium and rigorousness of the operation. Consider the
system downtime when maintenance cycle is running. Ensure that it does not affect the system
performance. Maintenance majorly involves sensor cleaning and verifying connections.
6.1.1 Test Terminal
Test Terminal is marked as TEST on the terminal block. Connect TEST and negative terminal to
the test terminal. Ensure that the voltage across the receptacles is kept below the diode
threshold voltage so that no current passes through the diode. Make sure that the resistance of
the test connection does not exceed 10 ohms while connecting an indicating meter or while
taking the test readings. Note that a resistance of 30 ohms can cause an error of approximately
10% of actual value.
6.1.2 Disassembling the Electronics Housing
The transmitter assembly comes in dual-compartment housing; one contains the electronic
module, and the other contains all wiring terminals and the communication receptacles. The
separate compartment of wiring terminals ensures hassle free handling while running a routine
maintenance cycle.
6.1.3 External Cleaning
•
Use washing agent that will not damage the instruments.
• Protect the pressure sensing diaphragm from mechanical damage caused by sharp
objects or external pressure.
•
Mechanical cleaning of the diaphragm is strictly prohibited.
•
Do not point the nozzles to the diaphragm when cleaning by pressure washer.