MultiCal Operation Manual for MultiCal mmHgA/PSIA Pressure Module
Contents Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Overview 1 —— Overview INTRODUCTION MultiCal pressure modules are used to measure pneumatic or hydraulic pressures. They can also be used to measure vacuum. MultiCal modules don’t display pressure, since they only have an electrical output. Instead, the modules convert pressure to millivolts. Modules are used with devices capable of measuring DC millivolts, such as a digital multimeters or oscilloscopes.
—— Operation 2 Operation FUNCTIONS To ensure safe and accurate operation, please be familiar with the following operations and functions. !!WARNING: Severe injury or damage can occur through improper use of pressure instruments! Do not exceed recommended pressure limits of tubing and fittings. Be certain all pressure connections are secured. Never disconnect pressure instrumentation without first relieving system pressure.
Operation 3 Readings may change when the MultiCal is shifted from a vertical to a horizontal orientation. This is due to the oil filling that transmits the pressure signal from the stainless steel diaphragm to the silicon sensor. The magnitude of the shift is typically less than 0.15 mmHgA. The MultiCal is calibrated in a horizontal orientation. To compensate for position you can use the method below.
—— Calibration 4 Calibration RECOMMENDED EQUIPMENT A calibration cycle of 1 year is recommended to maintain the MultiCal within specifications. Instrument Minimum Specification Pressure Standard ± 0.025% of Reading Digital Voltmeter ± 0.025% of Reading with a 10MΩ input impedance You do not need to use a reference multimeter if the MultiCal will be used with only one multimeter. In those cases, your overall accuracy may be better if it is calibrated as a set with the matching multimeter.
Calibration 5 When resetting the adjustment range of the Fine Zero potentiometer (R1) should first be set to the center of its rotational range. To center the Fine Zero, rotate the Fine Zero potentiometer fully clockwise until a “click” is heard. Then rotate the Fine Zero potentiometer counter-clockwise 7½ turns. Adjust the Course Zero pot until the output is as close to zero as possible. Trim in the final reading to 0 mV ±0.01 mV with the Fine Zero potentiometer.
Specifications 6 Specifications —— —— The following specifications apply at 23 °C, ±5 °C for 1 year after calibration, and when used with measuring devices having 10MΩ input impedance, or shunted so that their input impedance is 10MΩ. Also, the module must be "zeroed" prior to taking measurements to achieve the pressure specifications. PRESSURE Pressure Range Accuracy 0 to 760mmHgA ��������������������������������� ±(0.08% of Reading + 0.
—— —— Specifications 7 TEMPERATURE DERATING Add to Basic Accuracy Specification. °C = ambient temperature. Temperature Range Derating 28 to 55 °C ��������������������������������������������� (0.016%/ °C) x ( °C – 28 °C) 18 to 28 °C ��������������������������������������������� No Derating 0 to 18 °C ����������������������������������������������� (0.048%/ °C) x (18 ° – °C) -10 to 0 °C ����������������������������������������������� (0.
—— Specifications 8 EC DECLARATION OF CONFORMITY DECLARATION OF CONFORMITY According to ISO/IEC 17050-1:2010 Manufacturer’s Name: Crystal Engineering Corporation An AMETEK Inc.
—— ——— — —— Support 9 Support CONTACT US Phone ��������������������������������������������������� (805) 595-5477 Toll-Free ����������������������������������������������� (800) 444‑1850 Fax ����������������������������������������������������������� (805) 595-5466 Email ����������������������������������������������������� crystal@ametek.com Web ��������������������������������������������������������� crystalengineering.
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