Frequently Asked Questions

ZOC Pressure Scanning Modules
Q: What are the power requirements. Answer
Q: How do I address the modules?  Answer
Q: How do I calibrate the modules?  Answer
Q: How often should I calibrate the modules?  Answer

What are the power requirements?
All ZOC modules require + 15Vdc and -15 Vdc for operation. This voltage does not need to be instrument grade. Sensor excitation voltage is developed on board the module.

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How do I address the modules?
Addressing is a 4 to 6 bit address line depending on the number of sensors in the module. All address line inputs are pulled up to the +15 Vdc input.

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How do I calibrate the modules?
The modules may be calibrated by applying the correct control pressure to switch the module to the Calibrate mode. Calibration pressures may be applied to all sensors from the CAL input. It is recommended that a second order polynomial be used to characterize each sensor for the best accuracy.

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How often should I calibrate the modules?
ZOC22b, 23b, and 33 modules will show a considerable amount of drift unless the module is installed in a Thermal Control Unit. For best accuracy, a ZOC module should be re-zeroed before each data point. Calibration should be checked prior to taking data.
ZOC17 and ZOC16TC modules are temperature compensated and do not require zero calibration as often as the ZOC22b,23b,and 33.

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