LTH Electronics MXD70 Series, Руководство пользователя, Страница: 485 / 631

Faults
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MXD70 Suspended Solids / Turbidity
Setup and Operating Guide
Faults
The sensor Reading is Incorrect

Ensure the sensor is mounted properly, that there is at least 25mm (1”) of clearance around the head
of the probe.

Establish that the sensor is specified to work within the range that is being monitored.
Current Output Is Incorrect or Noisy

Check that the unit is “On-Line” (see page 10)

Check that the maximum load for the current loop has not been exceeded. (750

).

Check that the terminals have been wired correctly.

Check that the cable screen is attached to Earth at one end and that the cable does not pass too
close to a power cable.

Check that he current output has been configured properly.
Relays Appear to Malfunction

Check that the unit is “On-Line” (see page 10)

Check that the set point configuration is correct (see Setpoints, Current Outputs and Digital Input
Configuration Guide)

If the relays are vibrating or “chattering” as they pass the set point, check the hysteresis setting and
increase if necessary.

Ensure that the relays are connected properly (see MXD73 Installation guide or MXD75 Installation
guide) and that the voltage/current levels are not exceeding
5A @ 30V DC or 5A @ 250V AC.

Check that the instrument input cables are not picking up excessive noise.
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.
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. Special arrangements will be
made in individual cases for goods returned from overseas.