Frequently Asked Questions

Frequently Asked Questions

We recommend that you service your LMI or Milton Roy dosing pump at least every two years but this can be down to every six months depending on how often your pump is dosing, the nature of the chemical being dosed and the environment the pump is sited.

In our spares kit’s you will receive a replacement diaphragm, four head screws, a shaft seal and two check valves. This can vary depending on the model of the pump. Please ask our sales office for details. 

Please refer to the instruction manual where it states that the head screws will need to be tightened after the first week of installation. If the pump has been operating for a longer period of time and develops a slight leaking around the head block this usually means that the diaphragm is starting to wear and the pump will need a service. 

If you have a pump which can take a pulsed signal or 4-20Ma input then check that you have the switch pointing towards the correct internal or external setting.

If this isn’t relevant to your pump or hasn’t solved your problem, there could be an issue with the EPU, pulser or another electrical component. Please ring our sales office and we can offer some technical advice. 

A double walled tubing adaptor is designed to connect the inner tube to the outer tube to form a seal at the injection point end of the installation only. If the inner tube develops a leak anywhere along the line it is then contained from the injection point all the way back to the pump area which SHOULD always be bunded, see illustration below:

The tubing connection kits are illustrated below and normally rely on a seal between the flat surface of the cone and the “o” ring which sits in the valve housing. The exception is the smallest bore tubing; 6mm and ¼” where the cones are inverted, see illustration below

 

This should be done periodically with the use of a calibration standard solution part numbers CC-1 and CC-3 according to the instruction manual. If you encounter any difficulties please contact our technical department on 01606 550583

This should be done periodically with the use of a calibration standard solution part numbers CP-2 and CP-3 according to the instruction manual. If you encounter any difficulties please contact our technical department on 01606 550583

This should be done periodically with the use of a calibration standard solution part number CO-1 according to the instruction manual. If you encounter any difficulties please contact our technical department on 01606 550583

When all checks for leakage have been made and eliminated, make sure the voltage supply matches the rating on the pump. This usually occurs when a 240V pump is installed on a 110V supply.

LMI can help you choose the correct K factor if you can provide the following information:-

  1. The maximum and minimum expected flow of water through the water meter.
  2. The proportion of chemical you require usually in ppm or %
  3. The strength of the chemical or key ingredient within the chemical, e.g. amount of chlorine within a given strength of Sodium hypochlorite.
  4. The pipe size or size of the water meter.

Then please contact our sales department for help.

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