National Instruments NI 9237 Hazardous Locations

© National Instruments Corp. 29 NI 9237 Operating Instructions and Specifications

measurements of voltages from specially protected secondary

circuits. Such voltage measurements include signal levels, special

equipment, limited-energy parts of equipment, circuits powered by

regulated low-voltage sources, and electronics.

Caution Do not connect the NI 9237 to signals or use for

measurements within Measurement CategoriesII,

III, or IV.

Hazardous Locations

U.S. (UL)................................ ..........Class I, Division 2,

GroupsA, B, C, D, T4;

Class I, Zone 2,

AEx nC IIC T4

Canada (C-UL)......................... ........Class I, Division 2,

GroupsA, B, C, D, T4;

Class I, Zone 2,

Ex nC IIC T4

Europe (DEMKO).............................EEx nC IIC T4

Contents

Main Page Safety Guidelines Safety Guidelines for Hazardous Locations Special Conditions for Hazardous Locations Use in Europe Special Conditions for Marine Applications Connecting the NI 9237 The NI 9237 has four RJ-50 receptacles that provide connections for four half or full bridges. Figure 1. NI 9237 Pin Assignments Page Page Figure 2. Connecting a Half or Full Bridge to the NI 9237 Page Wiring TEDS Channels NI 9237 Connection Options Remote Sensing circuit. Refer to Figure3 for an illustration of how to connect remote sense wires to the NI 9237. Figure 3. Connecting Remote Sense Wires to the NI 9237 Shunt Calibration Page Excitation Voltages Understanding NI 9237 Filtering Passband Stopband Alias-Free Bandwidth Understanding NI 9237 Data Rates Sleep Mode Specifications Input Characteristics Page Page Page Page Page Power Requirements Physical Characteristics Safety Safety Voltages Hazardous Locations Safety Standards Electromagnetic Compatibility CE Compliance Online Product Certification Shock and Vibration Environmental Environmental Management Waste Electrical and Electronic Equipment (WEEE) Calibration RoHS Where to Go for Support