Armfield PCT40 - Exercise C - Manual Operation of Normally Closed Solenoid Valve

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Exercise C - Manual operation of Normally Closed
solenoid valve
Objective
To manually control the level of water in the process vessel using a pressure sensor
to monitor the level with a Normally Closed solenoid valve (SOL1) controlling inflow
to the vessel.
Overview
Fluid level in a process vessel can be maintained manually, without the use of
automated sensor-controlled switches. In this exercise the operator uses a simple
on/off switch to control flow into the process vessel in order to maintain the fluid level
at the required set point.
Equipment Required
PCT40 bench with large process vessel, inner cylinder and supplied flexible tubing.
Equipment set up
Ensure that the apparatus has been set up according to the Installation section.
Ensure that the inlet connector for the apparatus (on the right of the plinth behind the
pressure regulator) is connected to a suitable mains water supply. Check that the
central cylinder is securely in position inside large process vessel. Using a suitable
length of tubing, connect the self-sealing connection socket on the base of the large
process vessel to the quick release connection on the valve SOL1 at the front right of
the plinth.
The drain valve at the end of the plinth should be directed to a drain and left open.
Solenoid valves 2 and 3 should be connected to a suitable drain using the tubing
supplied. The drain valve in the base of the large process vessel should also be
connected directly to drain using flexible tubing.
Connect the apparatus to a suitable PC on which the software has been installed
using the pale grey USB cable supplied. The flat connector on the cable connects to
the PC, usually via a socket at the back. The other end connects to the socket on the
orange panel on the front of the plinth. Check that the PC is working and switched
on.
Procedure
Switch on mains power to the console. The apparatus should not be left unattended
once in operation, and manual operation of the inlet pressure regulator and drain
valve should be used to control the fluid level if the vessel volume reaches the
overflow pipe, or the drainage channel in the plinth becomes full of water.
Run the PCT40 software and select Section 1: Level Control (inflow). Select the
icon to view the mimic diagram screen.
Partially close the drain valve on the bottom of the large process vessel to slightly
reduce the outlet flow rate.
In the Sample menu, select ‘Configure’, and check that the software is set to
Automatic sampling with a sample interval of five seconds and Continuous duration.