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August 18, 2003
III.
INSTALLATION
The sensor connector is potentially supplied with hazardous line voltage (~70VDC).
A.
Carefully remove the instrument from the shipping carton and remove all the packing
material. Inspect the equipment for any physical damage that may have occurred during
shipment.
NOTE: If there is any shipping damage save all packing
material and contact the shipping representative to file a
damage claim. Do not return the instrument to AMI unless prior
authorization has been received. (See Section IX)
B.
Install the liquid helium sensor as per the AMI document "Installation, Operation And
Maintenance Instructions for the AMI Liquid Helium Level Sensor."
C.
To facilitate mobility, the Model 150A is equipped with a single standard DB9 connector
which connects the instrument to a sensor. Connect the LHe sensor wires to the DB9
connector terminals as follows:
Wire Color
DB9 Pin Number
Signal Name
Red 1 I+
Yellow 6 V-
Black 7 I-
Blue 8 V+
IV.
OPERATION
A.
Connect the instrument to the sensor via the sensor (DB9) connector. Refer to Figure 1.
B.
Depress the READ push-button switch on the front panel to read the LHe level. The
button should be held for sufficient time to allow the meter reading to stabilize.
NOTE: The front panel LED should light to indicate sufficient
sensor current exists to make an accurate reading. The
instrument is calibrated to read the helium level directly on the
panel meter. If the LED does not light during the level
measurement, recharge the batteries. When the READ button is
released, the unit is automatically deenergized.
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Содержание 150
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