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IntelliPoint RF RML Series
5.2
Testing Electronic Unit
5.3
Testing Relay Circuits
Use the following steps to test the electronic unit:
1. Be sure environment is safe before removing lid from
housing.
2. Observe failsafe jumper on circuit board on top of
electronic unit (shown in Figure 2-5). Move jumper from
current setting to alternate setting [HLFS to LLFS or
vice versa]. Alarm & relay should change state.
3. If possible to access sensing element with material below
sensor, or remove the IntelliPoint from vessel, use your
finger to touch upper pad terminal, shown in Figure
2-5, while holding any bare metal portion of instrument
housing with other hand. Alarm & relay should change
state.
4. Again, with no material touching sensor element, touch
tip of sensing element with your finger while holding
any bare metal portion of instrument housing with other
hand. Alarm & relay should change state.
5. If IntelliPoint changes state while touching test point, but
not when touching tip of sensor, in most cases, integral
cable is faulty. Refer to Section 5.6 Testing Integral
Cable.
6. If IntelliPoint is stuck in one state:
a. Remove power.
b. Disconnect coax cable that joins sensing element to
electronic unit.
c. Apply power.
d. Repeat steps 3 and 4.
e. If IntelliPoint changes state with sensing element
disconnected, in most cases, sensing element is faulty.
Refer to Section 5.1 Testing Sensing Element.
7. If IntelliPoint fails all of the above tests, in most cases
the instrument is faulty. Use a replacement Input/Output
Module (IOM) or circuit board to determine fault. Consult
factory.
Use the following steps to check out the relay circuits:
A. Relay circuits consist of single-pole double-throw relay
contacts brought out to terminal strips for external
switching. See Figure 5-2.
B. Relay operation may generally be heard as an audible
click when background noise is not too high. Connect
ohmmeter to relay contacts to determine if they are
switching.
24
Troubleshooting
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