Walchem WebMaster Manuel d'instructions télécharger pdf (Page 101)

7.0 MAINTENANCE

The WebMaster controller requires very little routine maintenance. The electronic enclosure only

needs to be wiped down with a damp cloth to keep it clean. All other maintenance involves

cleaning and calibrating sensors, described in detail below.

Installation of a Y-strainer just upstream of the sensors will reduce the frequency of sensor

cleaning, but will require frequent cleaning itself! If the installation is unattended for long periods

of time, and the water is generally free of particulates, you may get more time between service

calls by leaving out the Y-strainer.

CAUTION! The W700 inner hinged face panel is secured with Phillips (#1) screws, which

require a tool to open. No user adjustments are inside. This panel should only be opened by

trained maintenance personnel.

7.1 Flow Switch Cleaning

The flow switch is designed to allow most particles to pass through, but it should occasionally be

disassembled and cleaned. The frequency of cleaning required will vary with the cleanliness of the

tower water. If the frequency of cleaning is excessive, and there are on-site personnel available,

installation of a Y-strainer will reduce the time required for maintenance.

Refer to the exploded view drawing of the assembly on the following page.

To clean the flow switch, close the isolation valves to stop sample flow. Open the sample valve to

relieve the pressure in the manifold. Remove the nut that holds the flow switch assembly in place.

Pull the flow switch assembly straight up and out. The switch and the red float should come out

together.

Clean the clear flow switch body with a bottle brush. Clean the switch/float assembly shaft with a

cloth. If there is any build-up between the float and the switch shaft, remove the o-ring that retains

the float on the shaft, and use a small bottle brush or compressed air to clean the inside of the float.

Reassemble all parts as shown in the exploded view diagram. Make sure that the sample valve is

closed, open the isolation valves, and inspect for leaks.

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Walchem WebMaster Manuel d'instructions Page 101