Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 211
The first place to begin diagnosing a sensor hardware problem is the 8310 unit. Turn the 8310
display on and use the arrow keys to move to the Diagnostics/Inputs sub-menu. Use the
up/down arrow keys to display each sensor and check to see if each is providing a reading. For
sensors that require switched 12 volts, check that switched power setting is configured
correctly.
After you have the live readings for the sensor on the display, logically work in an outward
direction from the 8310 to the sensor. Here are some of the questions you should ask:
Are the sensor wires properly connected to the terminal block? (Correct polarity? Screws
tight?)
Are the wires from the terminal block to the sensor OK?
Is there a connector at the sensor end?
If there is, is it solid? Is there moisture in it?
If this is an analog sensor, can I measure a voltage output at the terminal block? At the sensor
end?
If this is a switch closure device can I see the switch closure at the terminal block end with
the wires disconnected?
If I simulate the input (for example, hook up a known voltage across an analog input, or hook
a switch across a counter) does the live reading value change properly?
Is the 8310 drawing excessive current. Use an ammeter inline with the +12VDC positive
lead to measure the current. Excessive current may be caused by a faulty sensor or wiring.
In most cases, if you can simulate the input, you should. This will ensure that the 8310 is
operating properly. If you cannot get live readings off a sensor after checking the terminal block
connection, the wires, and any sensor-end connector, then you probably have a sensor failure.
If you can measure output at the instrument but have no live readings then you probably have a
corroded or loose connector or broken wire. Improper wiring should also be considered
(polarity reversed).
If you are certain that signal is reaching the 8310 but the live readings are zero, then you may
have a setup problem. Read the next section on diagnosing setup problems.
Setup Problems
Setup problems may also show up in several ways. Some of the ways include:
data is not recorded on any sensor;
data is not recorded from one or two of several sensors;
all recorded data is zero or some incorrect value for a sensor; recording cycles are skipped.
If no data is recorded, there are two likely setup problems. First, for data to be recorded
(logged) you must have Log turned ON. Second, Recording must be ON in the main menu. If
Recording is OFF then no data will be recorded for any sensor. If Log is none for any sensor, that
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