Omega TX91 - Manuals

3 1 Introduction The TX91 transmitter is normally powered by an unregulated DCpower supply as shown in Figure 1-3. The proportionally-transmit-ted signal begins at 4 mA, at the low end of its temperature range,and increases to 20 mA, at the high end of its temperature range.(There are various temper...

1.2 Features • 4-20 mA output • ±0.1% full-scale accuracy (with respect to the mV input signal) • Upscale break protection• Low cost 1.3 Models Available 1 Introduction 0 7 Table 1-1. Range Code Input Types Range J K T E 0 to 1 200°F J2 K2 T2 E2 -4 0 to 1 300°F J3 K3 T3 E3 -4 0 to 1 500°F J4 K4 T4 E...

Model Number Description TX91-(*) Thermocouple transmitter (J, K, T, or E) NB1TX-(*) NB1 thermocouple probe, 12" L, 1 / 4 " O.D., ungrounded junction, 304SS sheath, TX91Transmitter TX91 Models Available 8 *Insert range code from Table 1-1 For complete information on NB1 Thermocouple Probes, ...

9 2 Unpacking Remove the packing list and verify that all equipment has beenreceived. If there are any questions about the shipment, please callthe OMEGA Customer Service Department at 1-800-622-2378 or(203) 359-1660.Upon receipt of shipment, inspect the container and equipment forsigns of damage. T...

3.1 Mounting the TX91 The TX91 Transmitter may be:1. surface mounted,2. mounted inside a protection head (refer to figure 3-1), or3. installed into the OMEGA mounting track (part number RT) using an OMEGA mounting bracket (part number TX90-BR). Figure 3-2 shows the RT mounting track.Figure 3-3 shows...

3 Installation Figure 3-1 Assembly of the TX91 Transmitter Inside an OMEGA NB1 Protection Head (in inches) 11 DC POWER SUPPLY LOAD MOUNTING HOLES THERMOCOUPLE

Figure 3-2 RT Mounting Track (in inches) 12 Installation 3 CAUTION HANDTIGHTENTRANSMITTERMOUNTINGSCREWS ONLY.DO NOT OVER-TIGHTEN.

Installation 3 Figure 3-5 Wiring Diagram for the TX91 Potentiometers 16 THERMOCOUPLE

17 4 Calibration Instructions 4.1 Equipment Required • Precision mV source, with 0.001 mV resolution and ±0.002mV accuracy or • Precision DVM with ±0.002mV accuracy and adjustable mV source with 0.001mV resolution • OMEGA TRC III Ice Point Reference (or stable ice bath) • Temperature Reference Probe...

19 Calibration Instructions 4 4.3 Calibration Procedures (Refer to Figure 4-1) Connect the calibration equipment according to Figure 4-1 or 4-2.T h e t h e r m o c o u p l e w i r e ( J , K , T, E ) m u s t b e o f t h e s a m ecalibration as the transmitter being calibrated. Make sure that thewirin...

Figure 4-1. Calibration Set-Up Calibration Set-up 4 21

Malfunction or incorrect operation may be caused by:1. Reversed polarity: Check the wiring using Figure 3-5 as a guide. If the temperatureof the thermocouple increases while the current magnitudedecreases, the problem could caused by reversed polarity of the:a) thermocouple wiring b) power supply le...

26 6 Accessories Model No. Description TX90-BR Mounting Bracket PSU-24B Unregulated Power Supply, 24 Volts TX82A Process Loop-Powered Indicator RT 48” Mounting Track

27 7 Specifications General SIZE: 1.75" dia. X 1.125" high (includes terminal strip) ZERO/SPAN ADJUSTMENTRANGE: ±25% POWER SUPPLY VOLTAGEOPERATING RANGE: +11VDC to +44VDC, 28 mA max required per transmitter ACCURACY: ±0.1% of full scale (includes effects of hysteresis, repeatability and line...

Specifications 7 28 THERMAL ZERO SHIFT: < 0.01%/°F of span (span >5 mV) < 0.02%/°F of span (2-5 mV span) THERMAL SPAN SHIFT: < 0.01%/°F of span WEIGHT: 1.5 oz (50g) Output CURRENT OUTPUT SPAN: 4-20 mA DC CURRENT OUTPUT LIMITS: 3 to 28 mA, typical MAXIMUM LOOP RESISTANCE: (V supply – 11V)...

Appendix A Intrinsically Safe Interconnection Diagram 29