Armfield S12-MKII, Instruction Manual

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Armfield Instruction Manual
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Start with the pump switched off.
Close the flow control valves below both flowmeters. Ensure that the sump
tank is filled to the overflow with clean water.
Remove the cap from the top of the pressure relief valve at pump outlet.
Adjust the screw on the pressure relief valve to allow flow to bypass to sump
tank without restriction. Adjust both pressure regulators to give maximum flow
(pull knob on regulator then turn fully clockwise).
Switch on circulating pump and check that all water is returned to sump tank
via relief valve. Gradually adjust setting of relief valve until pressure indicated
on gauges of both regulators is 3.2 Bar. Tighten locknut to retain setting of
relief valve.
11. Calibrating the electronic load sensor fitted to S12-MKII-50.
When the optional data logging accessory is fitted, the electronic sensor used
to measure the total weight of the outlet collecting tank may require re-
calibration. If the reading from this sensor becomes suspicious then it can be
recalibrated as suggested below. The PCB is located inside an enclosure
below the outlet collecting tank. The potentiometers on the PCB can be
accessed by removing the front panel from the enclosure and sliding the PCB
forward.
Load Sensor
Remove the outlet collecting tank from the load platform.
Adjust VR2 until 0v (±0.1v) is measured at TP5. Confirm that Current Mass indicates
0 Kg in software.
Place a 5kg weight on the load cell platform then adjust VR1 until 2.5v (±0.1v) is
measured at TP5 (5 Kg in software). Remove the weight and check that TP5 returns
to 0v (±0.1v) and software returns to 0 Kg).
Replace the PCB in the electrical enclosure and replace the front panel.