Amd Limit Switch Maintenance; Electrical Verification - Tecfluid M21 Series Instruction Manual

Clean with compressed air or with a cloth or paper moistened with alcohol.
To reassemble the set, follow these steps:
Screw the regulating valve (5) to the metallic element (2).
Place the spring (8), in the housing of the valve body (9).
Insert the regulating valve (1) through the hole of the valve body (9).
Place the regulating membrane (11) so that its holes match the threaded holes of the valve
body (9).
Place the membrane body (10) so that the 6 holes match those of the regulating membrane
(11).
Fit and tighten the screws M6 (3) with their respective washers, alternately and crosswise to
ensure an uniform pressure over the entire membrane surface.
Install or replace by another with the same thickness, the PTFE seal of the support (7).
Screw completely the support (7) in the valve body (9).
Screw the connection (1) that connects the "T" on the fluid inlet to the membrane body (10).
Screw the connection (4) that connects the valve body (9) to the flowmeter M21.
17.7

AMD limit switch maintenance

17.7.1 Electrical verification
Check that the voltage at the terminals + and - is over 7.5 V when the vane is in the slot.
Connect a multimeter with the scale in DC mA, in series with the terminal +.
Verify that the current is less than 1 mA when the vane is into the slot and more than 3 mA
when the vane is out of the slot.
The verification can be done with the following circuit diagram:
9V battery
(nominal 8.2V
for NAMUR)
29