Ametek Drexelbrook 505-1320 Series, Installation And Operating Instructions Manual

Page: 34 / 40

28
505-1320 Series Ultrasonic Open Channel Flowmeter
TM
Table 5-1
Troubleshooting Sheet for Continuous Ultrasonic Instruments
Transmitter Model Number __________________Serial Number____________________
Process Material_________________Temperature_______________Pressure_____________
What is the Loop Current? ____________ Is it stable?________________
Test the ability of the electronic unit to produce 4 and 20 mA. Place switch 3 of SW8 to
the ON position (up). Now by alternating switch 2, ON position should = 4 mA. OFF
position should = 20 mA.
Are either of the 2 red LEDs illuminated? ________ (if yes, which one?)_______________
Check for 110 Vac on TB1 (see Figure 2-3)
or check for 24 Vdc on TB1 (see Figure 2-4) ___________
Loop supply voltage is measured at TB2 on 110 Vac unit or TB1-terminals 4 and 5 on a
24 Vdc unit. Loop supply voltage (with no load) should be 24-30 Vdc.
What is the position of the hex switch SW4 (located directly above SW8)?
What are the switch positions of SW8?
(All should be OPEN (down position) with the exception of position 4—it can be either
ON or OPEN).
List the positions of the Span and Zero rotary switches
SW1, SW2, SW3, SW5, SW6, and SW7?
SW1____ SW5____
In level mode, Zero must always be larger than Span. SW2____ SW6____
SW3____ SW7____
Transducer Temperature Check:
•••••
Expect to find 0.65 Vdc between brown terminal [BRN] and housing.
••••• Should be able to measure approximatly 290
µ
A on digital meter placed in
series with orange lead and its terminal [ORG].
With sensing element disconnected, expect reading of 12K ohm between center wire
terminal [CW] and shield [SHD], using an analog meter.