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14571 or 4501 Vacuum Gauge Operating Instructions
Sensor Connection: Connect the sensor to the system or vacuum manifold with flexible
vacuum hose. For best results connect sensor directly to the system through an isolation
valve. Great care must be used in connecting the vacuum pump and sensor to the system to
be sure no leaks exist. The sensor should be mounted with the base up (flare fitting down) to
help prevent contaminants from entering the sensor. Isolate the sensor from the system during
charging to prevent oil from entering the sensor.
Battery Operation:
While system is under a vacuum
1. Plug the sensor cable socket to the sensor.
2. Push power switch to ON (Model 4501) or BATT (Model 14571).
3. Set the READ-CALIBRATE switch to the CALIBRATE position.
4. Adjust the CALIBRATION ADJUST KNOB clockwise until the meter reads the
same on the calibration scale (lower scale) as the number stamped on the sensor.
5. Set the READ-CALIBRATE switch to the READ position and read microns on the
upper scale after it stabilizes.
AC Operation (Model 14571 only): Follow procedure outlined under battery operation except
plug power cord into 110V AC power source and set power switch to AC.
Calibration Notes: Check the calibration at frequent intervals as the batteries wear or ambient
temperature changes. The sensors are ambient temperature compensated but require the
calibration procedure to be performed to insure accuracy. The calibration procedure is to be
performed while under vacuum.
Low Temperature Operation: Cold temperatures may prevent the meter from reading past
atmospheric. To compensate for cold sensor temperatures change the initial calibration
procedure as follows. Set the READ-CALIBRATE switch to the READ position and adjust
the CALIBRATION ADJUST KNOB fully clockwise until the meter reading climbs to 500
microns (may take more than a minute). Quickly set the READ-CALIBRATE switch back to
the CALIBRATE position and proceed with the normal calibration procedure. Always try to
keep the instrument at or near room temperature.
Battery Replacement For battery operation uses (2) D flashlight batteries. Battery power is
disconnected from the unit when the sensor is removed from the cable socket
Replacement Sensor: Order Model 4510 Sensor. The sensor should be checked periodically
for accuracy by substituting with another sensor.
THERMAL ENGINEERING COMPANY
A Division of Airserco Manufacturing Company LLC
7555 Tyler Boulevard; Mentor, OH 44060 800-473-1754 Fax: 440 946-8188
www.thermalengineeringcompany.com
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