American Diagnostic Corporation (ADC) e-sphyg 7002 - Manual (Page 10)

Calibration of Digital Gauge
Gauge accuracy can be checked visually whenever it is switched on. If the unit is used more than
15,000 times, a calibration reminder message (CAL) will appear on the digital display. Any digital
gauge that displays this message should be returned for re-calibration to ADC’s Service Depart-
ment. Only ADC or an authorized service technician is qualified to perform this calibration serv-
ice.
Do not attempt to recalibrate the gauge yourself.
In addition to the visual inspection indicated above, we also recommend you
perform the following calibration check on an annual basis:
• Connect your gauge to a high-quality, known pressure standard using ADC’s “Y” Test Kit
(part number 991)
• Pressurize the gauge to 300 mmHg
• Reduce the pressure at a rate no greater than 10 mmHg per second, and stop to check at
the following test points: 300mmHg, 240 mmHg, 160 mmHg, 120 mmHg, and 80 mmHg. Your
gauge should be within +/-3 mmHg of your reference standard.
ADC recommends using the most sensitive pressure standard possible when performing this
calibration check, as your ability to measure the accuracy of a gauge depends on the sensitivity
of the pressure standard. If you are using a reference pressure standard that is only calibrated to
+/- 3 mmHg (such as a mercury column or aneroid gauge), then you will only be able to deter-
mine the accuracy of the test gauge to within +/- 6 mmHg. If you use a reference pressure stan-
dard that is +/- .01 mmHg (such as a digital pressure standard), you will be able to determine
the accuracy of the gauge being tested to within +/- 3.1 mmHg.
In the event that the gauge is ever in need of calibration, simply return to ADC. Damaged or bro-
ken parts will be replaced as needed at a minimum charge. Refer to the warranty for specific de-
tails of warranty coverage.