Crystal XP2i 2nd Generation Manuel d'utilisateur télécharger pdf (Page 27)

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XP2i Operation Manual



CALIBRATION

If adjustment is required, we recommend returning the unit to the factory. Factory service oﬀers beneﬁts you won’t ﬁnd anywhere else. We have the facili-

ties to test your gauge at a variety of temperatures utilizing NIST traceable standards, resulting in calibration certiﬁcates that provide performance data over

temperature. Furthermore, upgrades may be available to add or enhance operating features. We designed the product to last, and we support it so that you

can get the most from your investment.

Under normal operating conditions, we recommend the XP2i be calibrated on an annual basis. Your quality system may require more or less frequent calibra

tion, or your experience with the gauge, or operating environment may suggest longer or shorter intervals.

Although we prefer that you return the XP2i to Crystal Engineering for calibration, ordinary recertiﬁcation and/or adjustments may be performed by any

qualiﬁed personnel with appropriate training and equipment. The following instructions are ONLY intended for such qualiﬁed personnel with appropriate test

equipment. We recommend that the calibration standards used have a minimum rated accuracy of 0.025% of reading, or equivalent in terms of percent of full

scale. This level of accuracy requires the use of piston (deadweight) gauges or very high performance pressure controllers.

There are no internal potentiometers. The XP2i contains a “span” factor, set to approximately 1 (as shipped from the factory). As components age this may

need to be changed to a value slightly higher or lower, to slightly increase or decrease all readings. This adjustment can be made with or without a computer

(see: CongXP Conguration Software).

“Zero” the XP2i, then record displayed pressure for two or more pressure points. Determine if the XP2i would beneﬁt from an overall increase or decrease of

the indicated pressures.

To change the span factor from the keypad, turn oﬀ the XP2i, then press the

(on/o), (units), and (peak) buttons simultaneously. The ﬁrmware version will

be brieﬂy displayed, followed by the word “cal”, followed by the actual span value. The span factor may be adjusted by pressing either the

(units) or (peak)

button to increase or decrease the value, respectively. The value changes in 0.0001 increments. Press the

(zero) button to store the new value in memory, or

the

(on/o) button to cancel the change.

For absolute XP2is, it is possible to correct for long term drift using a second calibration factor, zero value oﬀset. ConﬁgXP and a barometric reference with

accuracy of 0.1 PSI or better is required to perform the calibration. To calibrate the zero oﬀset, clear the zero as described earlier in this manual by pressing

and holding the

(zero) button until “- - -” appears. Once cleared, subtract the displayed pressure from barometric pressure, add this diﬀerence to any existing

zero value oﬀset in ConﬁgXP, and update the gauge (new value = barometric – displayed + existing). For example, if the displayed value is 14.5 PSI, barometric

pressure is 14.7 PSI, and the existing zero value oﬀset in ConﬁgXP is 0.1 PSI, the new zero value oﬀset would be 0.3 PSI (14.7 - 14.5 + 0.1 = 0.3).

The span factor and zero value oﬀset can be viewed and set directly by ConﬁgXP. Span factor adjustment through the keypad

can be disabled by ConﬁgXP through the disable span factor feature or by password protecting the XP2i .

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Crystal XP2i 2nd Generation Manuel d'utilisateur Page 27

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