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Isco 4700 Refrigerated Sampler
Section 5 Maintenance
5.2.7 Test Flow Meter Port
SELECT DIAG: (<-->)
TEST FLOWMETER PORT
INSTALL TEST PLUG
↵
PRESS
WHEN READY!
FLOWMETER PORT TEST:
...TESTING
5.2.8 Refrig Temperature
SELECT DIAG: (<-->)
REFRIG TEMPERATURE
REFRIG TEMPERATURE:
AIR=__C EVAP=__C
5.2.9 PCB Temperature
5-10
The TEST FLOWMETER PORT diagnostic tests the sampler's
ability to send event marks, and receive an enable pin signal and
flow pacing pulses.
Note
This diagnostic routine is not for field use. This test requires a
test plug which is inserted into the External Device connector.
If you have checked all the connections with the external flow
meter and still suspect a fault with the event mark or flow pacing
signals, contact your authorized Isco service facility or the
Teledyne Isco factory. They will be able to assist you with
obtaining a test plug or making the necessary jumper connec-
tions to run the test.
To run the test:
1. Select the TEST FLOWMETER PORT option and press
Enter.
2. Insert a Flow Meter Port Test Plug into the Flow Meter
connector.
3. The sampler tests the send and receive circuits for the
event marks, sampler enable pin (inhibit), and flow pulses.
If the sampler displays FAILED: EM->FP or FAILED: INHIBIT,
verify that test plug is correctly inserted. Then, perform the
TEST FLOWMETER PORT diagnostic again from step 1. If the
test still fails, contact your authorized Isco service facility or the
Teledyne Isco factory.
The REFRIG TEMPERATURE diagnostic displays the temper-
ature of the refrigerated compartment. When this test is started,
the sampler will display the temperature until you press the Stop
or Enter button. There is no pass or fail. This test simply pro-
vides continuous temperature monitoring and cooling/heating
states.
To display the refrigerator temperature:
1. Select the REFRIG TEMPERATURE option and press Enter.
2. The display shows the temperature until you press the
Stop or Enter button.
The TEST PCB TEMPERATURE diagnostic displays the temper-
ature of the Main CPU Printed Circuit Board (PCB). When this
test is started, the sampler will briefly display the temperature.
The Main CPU board has a heater which prevents condensation
from forming inside the electronics compartment. If the sampler
has been connected to AC power for at least 30 minutes, the PCB
temperature should be greater than the ambient temperature.
To display the PCB temperature:
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