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Summary of Contents for Omega TX94A
- Page 1 User’s Gui d e Shop online at omega.com e-mail: info@omega.com For latest product manuals: www.omegamanual.info TX94A Ultra-Miniature Temperature Transmitters...
- Page 2 Fax: (203) 359-7700 e-mail: info@omega.com For Other Locations Visit omega.com/worldwide The information contained in this document is believed to be correct, but OMEGA accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.
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Page 3: Table Of Contents
TABLE OF CONTENTS Section 1 Getting Started 1.1 Unpacking ........1 1.2 Safety and EMC Considerations . - Page 4 FIGURES & TABLES Figure 1-1 RTD Transmitter ........2 Figure 2-1 Assembly inside a Protection Head .
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Page 5: Unpacking
1.1 Unpacking Remove the packing list and verify that you have received all equipment. If you have any questions, contact the nearest Customer Service Department, as listed on the cover of this manual. Upon receipt of shipment, inspect the container and equipment for any signs of damage. -
Page 6: General Description
1.3 General Description The transmitter is normally powered by an unregulated power supply as shown in Figure 1-1. The proportionally-transmitted signal begins at 4mA, at the low end of its temperature range, and increases to 20mA, at the high end of its temperature range. (There are various temperature ranges available for the transmitter. -
Page 7: Models Available
0 to 500 F (-18 to 260 C) 0 to 750 F (-18 to 399 C) 0 to 1000 F (-18 to 538 C) Table 1-2 Model Numbers Model Number Description TX94A-(*) RTD Transmitter (100 ohm, Pt, alpha=0.00385) *Insert range code from Table 1-1... -
Page 8: Mounting
2.1 Mounting The transmitter may be: 1. surface mounted 2. mounted inside a protection head (shown in Figure 2-1) POWER LINES RTD WIRES SECTION A-A Figure 2-1 Assembly of the Transmitter inside an PR-14 Protection Head... -
Page 9: Wiring
2.2 Wiring Refer to Figure 2-2 Connect a dc power supply in series with the load to the (+PS) and (-PS) power terminals. Note that the load (usually a monitoring instrument) may be connected to either the (+) or (-) power lead. Connect the RTD element to the (+IN) and (-IN) input terminals. -
Page 10: Equipment Required
Select, from Table 3-1, the correct ohmic values for the Z (zero) and S (span) adjustments that correspond to the model number. For example, for Model TX94A-2, the Z value is 92.95 ohms, and the S value is 135.84 ohms. -
Page 11: Calibration Procedures
DECADE RESISTANCE BOX Figure 3-1 Transmitter Calibration Set-Up Table 3-1. Calibration Values Temperature Resistance Input (Ohms) Input Range Model Alpha=0.00385 Zero/Span TX94A Zero/Span -40/120°F 84.27 / 119.01 0/200°F 92.95 / 135.84 0/300°F 92.95 / 156.94 0/500°F 92.95 / 197.69 0/750°F 92.95 / 246.69... -
Page 12: Troubleshooting Guide
4.1 Troubleshooting Guide Malfunction or incorrect operation may be caused by: Incorrect Readings: Check for improper wiring using Figure 2-2 as a guide. Loose or broken wires: Check each terminal connection for tightness. Move each wire back and forth and note any changes in operation. Too high a load resistance in the output current loop or too low a current rating on the power supply: Measure the total resistance of each device (excluding the... -
Page 13: Specifications
5.1 Specifications 0.250 [6.35] General 0.156 [3.96] Size: for #6-32 SCREW 2 PLCS 1.40 [35.6] 1.40” dia. x 0.93” high (includes terminal strip) Weight: 0.53 oz (15g); 0.480 [12.19] 0.480 [12.19] 0.83 oz (25g) if potted Ambient Temperature: -13°F to 185°F (-25°C to 85°C) 0.93 [23.6] 0.52 [13.2]... - Page 14 5.1 Specifications (continued) Output Current Output Span: 4-20 mA dc Current Output Limits: 3 to 28 mA, typical Max Loop Resistance: (Vsupply – 8V) / 0.020A = ohms Load Resistance Effect: 0.01% of span per 300 ohms change Power Supply Effect: 0.002% of output span per volt Input Sensor:...
- Page 15 Department will issue an Authorized Return (AR) number immediately upon phone or written request. Upon examination by OMEGA, if the unit is found to be defective, it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but not limited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorized modification.
- Page 16 Where Do I Find Everything I Need for Process Measurement and Control? OMEGA…Of Course! Shop online at omega.com TEMPERATURE M U Thermocouple, RTD & Thermistor Probes, Connectors, Panels & Assemblies M U Wire: Thermocouple, RTD & Thermistor M U Calibrators & Ice Point References M U Recorders, Controllers &...
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