MICROPUMP, INC.
A Unit of IDEX Corporation
PO Box 8975, Vancouver, WA 98668-8975 • Phone: 360/253-2008 • Fax: 360/253-8294
MICROPUMP
LIMITED
A Subsidiary of Micropump, Inc.
2 Howard Road, Eaton Socon, St.
Neots, Cambridgeshire, PE 19 8ET England, • Phone: 011-44-1480-356600 • Fax: 011-44-
1480-
356300
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using two screwdrivers, one on either side. If magnet assembly is
out of radial alignment, replace assembly.
2.4.2 Pump Test
2.4.2.1 This test is conducted using the test setup shown in Figure C. The
purpose of the test is to confirm proper operation. If pump fails on any
step, refer to Troubleshooting.
2.4.2.1.1 Close valves 1 and 2.
2.4.2.1.2 Fill tank with water.
2.4.2.1.3 Connect Model 668-400-2 into setup as indicated.
2.4.2.1.4 Open valve 1 completely and valve 2 partially.
2.4.2.1.5 Actuate circuit breaker if required.
2.4.2.1.6 Energize Model 668-400-2 by pressing start button on switch-light
assembly to establish initial system pressure. Release start button.
Indicator light should remain on (motor running).
2.4.2.1.7 Slowly close valve 2 until indicator light shuts off (motor stops). At
that moment, pressure gauge should read 22 psi (1.52 bar) to 24
psi (1.66 bar).
2.4.2.1.8 Re-energize Model 668-400-2 by holding start button down. Close
valve 2 completely. Pressure should not read higher than 25 psi
(1.73 bar). On releasing start button, indicator light should shut off
(motor stops).
2.4.2.1.9 Slowly open valve 2. Pump should re-energize at 12-20 psi (.83-
.38 bar) automatically. Indicator light should come on. Continue to
open valve 2 until indicator light shuts off (motor stops). At that
moment, pressure gauge should read 4 psi (0.28 bar) to 8 psi (0.55
bar).
2.4.2.1.10 Close valves 1 and 2. Add one hand pump to test setup between
pressure gauge and valve 2. Open valve 1 completely and valve 2
partially. Energize pump and run for one minute to establish water
in test system. De-energize pump and close valves 1 and 2.
Disconnect tubing from valve 1 (pump side). Establish system
pressure with hand pump, allowing pressure to build slowly to 25
psi (1.73 bar). While watching tubing disconnected from valve 1,
raise system pressure slowly toward 30 psi (2.07 bar). Water
should start to leak from tubing at 30 psi (2.07 bar).
