Crystal Engineering Corporation Reference Pressure Recorder NV-4AA-RTD100-3MPA

Warning: Do not remove or change the batteries in a hazardous atmosphere

The nVision is Intrinsically Safe only if powered by one of the following battery types: Rayovac Maximum Plus 815, Energizer® E91, Energizer® EN91, or Duracell MN1500. The ratings and ambient temperature ranges vary so take care to determine if you are selecting the proper replacement for your requirement

Select the type of battery used

Unscrew the four captive screws (knurled Phillips head) to gain access to the battery compartment. Replace the batteries taking care to note polarity for their proper installation

After replacing the batteries and reinstalling the power module, the nVision will start operating immediately (without having to press the button); This indicates that a complete reset has occurred, and is normal. Verify the battery module is properly sealed and installed to maintain your IP67 rating

Failure to properly seal the battery compartment may allow water damage that could permanently compromise the nVision. IP67 rating will be void if nVision is operated without 4AA power module in place

Sign off on the battery replacement

1. If adjustment is required, we recommend returning the Vision or separate modules to the fac-tory. Factory service offers benefits you won't find anywhere else

2. There is the AZLA accredited Calibration Laboratory facilities to test your Vision Reference Recorder 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

3. Under normal operating conditions, we recommend the Vision be calibrated on an annual basis. Your quality system may require more or less frequent calibration, or your experience with the gauge, or operating environment may suggest longer or shorter intervals

4. Although we prefer that you return the Vision 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

5. We recommend that the calibration standards used have a minimum rated accuracy of 0.008% 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 nVision contains a "span" factor (userspan), 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 read-ings. This adjustment can be made with a computer through CrystalControl

Calibration for Pressure Modules (PM): "Zero" the nVision, then record displayed pressure for two or more pressure points. Determine if the nVision would benefit from an overall increase or decrease of the indicated pressures. Adjust userspan according and validate results

Calibration for Temperature Modules (RTD100): The RTD sensor can be calibrated through the use of the span factor (userspan) and the Base Resistance (Ro) at 0°C. Record displayed temperature for two or more temperature points. Determine if the nVision would benefit from an overall increase or decrease of the indicated temperatures and modify using the userspan feature in CrystalControl