Faults
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MXD70 Dissolved Oxygen
Setup and Operating Guide
Faults
The Sensor Condition is Showing “Span High”
The sensor output was too high at span calibration. Check the following possible causes.
Possible faulty sensor connector. Check to see if sensor connector pins are covered with liquid or
dirt. Clean following the sensor manufacture’s guidelines and then check the resistance between
the cathode and anode is low.
Possible short-circuit between the cathode and the anode. Check both the sensor and the sensor
cable.
Cathode glass broken (on some sensors only). The sensor will need to be replaced.
Membrane is broken. Visually inspect membrane for any tears and replace if present.
Check that the probe type, bias voltage and membrane correction factor have been set correctly in
the instrument. Also ensure all sensor protective caps have been removed.
If using manual pressure and temperature compensation ensure that the correct values have been
entered.
The Temperature Reading Is Incorrect
Check that the temperature sensor is correctly attached. (See Installation Section).
Check that the temperature sensor type is correctly selected in the Channel Setup menu (See page
17).
Where practical check the temperature sensor resistance against the table on page 41.
Check the user calibration
Guarantee and Service
Products manufactured by LTH Electronics Ltd are guaranteed against faulty workmanship and
materials for a period of three years from the date of despatch, except for finished goods not of LTH
manufacture, which are subject to a separate agreement.
All sensors made by LTH Electronics Ltd are thoroughly tested to their published specification before
despatch. As LTH have no control over the conditions in which their sensors are used, no further
guarantee is given, although any complaints concerning their operation will be carefully investigated.
Goods for attention under guarantee (unless otherwise agreed) must be returned to the factory
carriage paid and, if accepted for free repair, will be returned to the customer’s address free of charge.
Arrangements can also be made for repair on site, in which case a charge may be made for the
engineer’s time and expenses.
If any services other than those covered by the guarantee are required, please contact LTH direct.
N.B. Overseas users should contact their LTH nominated representative. www.lth.co.uk/distributors.asp
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