| | | The standard assemblies in this section will fit a wide variety of installations. However, for more versatility you can create new assemblies from the probes, accessories, and transmitters in the pages listed. Follow these steps: 1. Choose a probe Select an RTD or thermocouple from Section 3. The section includes tip-sensitive, high temperature, and fast response models. Some have integral fittings or bayonet lockcaps. Factors to consider are: • Temperature rating • Compatibility with receiving instruments • Probe style and diameter • Accuracy vs. cost 2. Add a fitting See Section 4 for probe mounting fittings. Adjustable fittings, combined with cut-to-length probes, allow instant fabrication of assemblies to any length required. Included are spring-loaded holders, pressure fittings, and bayonet-style fittings. Factors to consider are: • Temperature rating • Probe diameter • Correct NPT threads • Pressure ratings • Compatibility with environment 3. Select a thermowell Thermowells protect sensors from the effects of fluid flow and pressure. See Section 4 for a variety of well styles and materials. Factors to consider are: • Pressure rating • Compatibility with fluid media • Insertion depth • Correct NPT thread | | 4. Attach a connection head Finish off your assembly with a connection head for termination to remote extension wires. See page 4-2 for specifications. Factors to consider are: • Connection head size • Temperature rating • Correct pipe threads for fitting and conduit • Number of terminals or wire nuts • Hazardous area requirements 5. Install a transmitter Transmitters convert sensor output toa4to20mAcurrent signal, immune to leadwire resistance. See Section 5 for RTD and thermocouple transmitters. Factors to consider are: • Transmitter accepts sensor input • Transmitter fits connection head • Ambient temperature range acceptable 6. How to calculate probe length All Minco fittings have probe length adders to help you determine total probe length. Total length L is the insertion depth D plus the adder A. | | |