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Omega TX91 - page 1
FM APPROVED TX91 Thermocouple T wo-Wire T emperature T ransmitter omega.com e-mail: info@omega.com For latest product manuals: omegamanual.info U ser ’ s Guide Shop online at MADE IN ...
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Omega TX91 - page 2
Servicing North America: U.S.A.: ISO 9001 Cer tified One Omega Drive, Box 4047 Stamford, CT 06907-0047 T el: (203) 359-1660 F AX: (203) 359-7700 e-mail: info@omega.com Canada: 976 Bergar Laval (Quebec) H7L 5A1, Canada T el: (514) 856-6928 F AX: (514) 856-6886 e-mail: info@omega.ca For immediate technical or application assistance: U.S.A. and Canada ...
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Omega TX91 - page 3
It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety and EMC/EMI regulations that apply . OMEGA is co nstantly pur- suing certification of its products to the European New Approach Directives. OMEGA will add the CE mark to every appropriate de vice upon certification. The information contained in this document is believed ...
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Omega TX91 - page 4
TX91 Miniature T wo-Wire Thermocouple T ransmitter Page Section 1 Introduction 1 1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.3 Models A vailable . . . . . . . . . . . . . . . . . . . . . . ...
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Omega TX91 - page 5
TX91 Miniature T wo-Wire Thermocouple T ransmitter Page Section 4 Calibration Instructions 18 4.1 Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 4.2 Set-up of Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 4.3 Calibration Procedur es . . . . . . . . . . . . . . . . . . . ...
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Omega TX91 - page 6
1 1 Introduction 1.1 General Description The OMEGA ® TX90 Series T emperatur e T ransmitters consist of the TX91 Miniature T wo-W ire Thermocouple T ransmitter and the TX92 Miniature T wo-W ire R TD T ransmitter . This manual is written for the OMEGA TX91 Thermocouple T ransmitter . The TX91 T ransmitter accepts thermocouple sensor types J, K, T , ...
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Omega TX91 - page 7
Figure 1-1. Photo of TX90 Series T ransmitter Figure 1-2. General Dimensions (in inches) 1 2 Introduction 1 (For Mounting) ...
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Omega TX91 - page 8
3 1 Introduction The TX91 transmitter is normally powered by an unr egulated DC power supply as shown in Figure 1-3. The pr oportionally-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 temperatur e range. (There ar e various temperature ranges and thermocouple types availa ...
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Omega TX91 - page 9
0 4 Introduction 1 The TX91 two-wire transmitter r eceives and measures signals from thermocouples and sends an output current of 4-20 mA which is directly proportional to the thermocouple millivolt input. It is designed to connect with only two copper wire leads that will supply the voltage to operate the transmitter from a DC power supply , and a ...
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Omega TX91 - page 10
0 5 Introduction 1 The TX91 has reverse supply polarity pr otection and will operate with a wide range of supply voltages (1 1 to 44VDC). It has an input sensor break-pr otection circuit that forces the output curr ent to go upscale when the thermocouple wire opens. It also is pr ovided with a screw terminal, where the output curr ent can be measur ...
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Omega TX91 - page 11
Figure 1-4. S traight line Approximation of Curve 0 6 1 Introduction ...
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Omega TX91 - page 12
1.2 Features • 4-20 mA output • ±0.1% full-scale accuracy (with respect to the mV input signal) • Upscale break pr otection • Low cost 1.3 Models A vailable 1 Introduction 0 7 T able 1-1. Range Code Input T ypes 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 E4 -4 0 to 1 750°F J5 K5 E5 -4 0 ...
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Omega TX91 - page 13
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, TX91T ransmitter TX91 Models Available 8 *Insert range code from T able 1-1 For complete information on NB1 Thermocouple Probes, see the OMEGA T emperature Handbook. 1 Introd ...
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Omega TX91 - page 14
9 2 Unpacking Remove the packing list and verify that all equipment has been received. If ther e are any questions about the shipment, please call the OMEGA Customer Service Department at 1-800-622-2378 or (203) 359-1660. Upon receipt of shipment, inspect the container and equipment for signs of damage. T ake particular note of any evidence of r ou ...
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Omega TX91 - page 15
3.1 Mounting the TX91 The TX91 T ransmitter may be: 1. surface mounted, 2. mounted inside a protection head (r efer to figure 3-1), or 3. installed into the OMEGA mounting track (part number RT) using an OMEGA mounting bracket (part number TX90-BR). Figure 3-2 shows the R T mounting track. Figure 3-3 shows the TX90-BR mounting bracket. Figure 3-4 s ...
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Omega TX91 - page 16
3 Installation Figure 3-1 Assembly of the TX91 T ransmitter Inside an OMEGA NB1 Protection Head (in inches) 11 DC PO WER SUPPL Y LO AD MOUNTING HOLES THERMOCOUPLE ...
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Omega TX91 - page 17
Figure 3-2 R T Mounting T rack (in inches) 12 Installation 3 CAUTION HANDTIGHTEN TRANSMITTER MOUNTING SCREWS ONL Y . DO NOT OVER- TIGHTEN. ...
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Omega TX91 - page 18
3 Installation 13 Figure 3-3 TX90-BR Mounting Bracket (in inches) ...
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Omega TX91 - page 19
Figure 3-4 Installation with Bracket and T rack (in inches) TX90-BR & R T 14 Installation 3 MOUNTING TRACK (RT) MOUNTING BRACKET TX90-BR ...
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Omega TX91 - page 20
15 3 Installation NOTE A milliamp monitoring instrument can be used in the circuit by connecting the monitor’ s positive lead to (+PS) and the negative lead to (M). This allows monitoring the current loop without disconnecting the main wiring. 3.2 Wiring the TX91 (Refer to Figure 3-5) 1. Connect a DC power supply in series with the load to the (+ ...
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Omega TX91 - page 21
Installation 3 Figure 3-5 W iring Diagram for the TX91 Potentiometers 16 THERMOCOUPLE ...
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Omega TX91 - page 22
17 4 Calibration Instructions 4.1 Equipment Required • Precision mV sour ce, with 0.001 mV resolution and ±0.002mV accuracy or • Precision DVM with ±0.002mV accuracy and adjustable mV source with 0.001mV r esolution • OMEGA TRC III Ice Point Reference (or stable ice bath) • T emperatur e Reference Probe (OMEGA P/N: TRP-(*)) *Thermocouple ...
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Omega TX91 - page 23
18 Calibration Instructions 4 4.2 Set-up of Equipment T o pr epare the ice bath: a) Fill a glass beaker with crushed ice made from distilled water . b) Fill the beaker with enough distilled water so that ice just becomes slush, but not enough to float the ice. c) Insert the refer ence thermocouple. Figure 4-2 shows an alternate set-up. Her e, a hig ...
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Omega TX91 - page 24
19 Calibration Instructions 4 4.3 Calibration Procedures (Refer to Figur e 4-1) Connect the calibration equipment according to Figur e 4-1 or 4-2. The thermocouple wire (J, K, T , E) must be of the same calibration as the transmitter being calibrated. Make sure that the wiring polarities are corr ect. (Note that the RED thermocouple wire is NEGA TI ...
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Omega TX91 - page 25
20 4 Calibration Instructions If a Thermocouple Calibrator/Simulator is used, such as the OMEGA Model CL51 1 Precision Calibrator , select the T emperature Input Z (zero) and S (span) values. 3. Set the DC mV source to the selected Z (zero) mV value. Adjust the Z potentiometer to read 4.000 mA on the monitoring instrument. 4. Set the DC mV source t ...
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Omega TX91 - page 26
Figure 4-1. Calibration Set-Up Calibration Set-up 4 21 ...
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Omega TX91 - page 27
Figure 4-2. Calibration Set-Up. (Alternate) 22 Calibration Instructions 4 SP AN TX91 ZERO INPUT THERMOCOUPLE WIRE ...
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Omega TX91 - page 28
4 Calibration Instructions 23 T able 4-1. Calibration Values for the TX92 T emperature mV INPUT Input Range Model REF 32°F Zero/Span TX92 Zero/Span 0/ 1 200°F -J2 -0.855/ 1 4.906 0/ 1 300°F -J3 -0.885/ 1 7.947 0/ 1 500°F -J4 -0.885/14.108 0/ 1 750°F -J5 -0.885/20.406 0/1000°F -J6 -0.885/29.515 0/ 1 200°F -T2 -0.674/ 1 3.967 0/ 1 300°F -T3 - ...
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Omega TX91 - page 29
Malfunction or incorrect operation may be caused by: 1. Reversed polarity: Check the wiring using Figure 3-5 as a guide. If the temperatur e of the thermocouple increases while the curr ent magnitude decreases, the pr oblem could caused by reversed polarity of the: a) thermocouple wiring b) power supply leads c) monitor instrument 2. Loose or broke ...
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Omega TX91 - page 30
25 5 T roubleshooting Guide a) Measure the total r esistance of each device (excluding the transmitter and power supply) in the 20 mA loop, including the resistance of the lead wir es. b) Calculate the maximum allowable loop resistance using the formula: Loop Resistance (maximum) = V supply -1 1V 0.020A For example, a 24V power supply would give a ...
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Omega TX91 - page 31
26 6 Accessories Model No. Description TX90-BR Mounting Bracket PSU-24B Unregulated Power Supply , 24 V olts TX82A Process Loop-Powered Indicator RT 48” Mounting T rack ...
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Omega TX91 - page 32
27 7 Specifications General SIZE: 1.75" dia. X 1.125" high (includes terminal strip) ZERO/SP AN ADJUSTMENT RANGE: ±25% POWER SUPPL Y VOLT AGE OPERA TING RANGE: +11VDC to +44VDC, 28 mA max required per transmitter ACCURACY : ±0.1% of full scale (includes effects of hysteresis, repeatability and linearity proportional to the T/C) AMBIENT ...
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Omega TX91 - page 33
Specifications 7 28 THERMAL ZERO SHIFT : < 0.01%/°F of span (span >5 mV) < 0.02%/°F of span (2-5 mV span) THERMAL SP AN SHIFT : < 0.01%/°F of span WEIGHT : 1.5 oz (50g) Output CURRENT OUTPUT SP AN: 4-20 mA DC CURRENT OUTPUT LIMITS: 3 to 28 mA, typical MAXIMUM LOOP RESIST ANCE: (V supply – 11V)/0.020A = ohms LOAD RESIST ANCE EFFECT ...
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Omega TX91 - page 34
Appendix A Intrinsically Safe Interconnection Diagram 29 ...
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Omega TX91 - page 35
WARRANTY / DISCLAIMER OMEGA ENGINEERING, INC. warrants this unit to be free of defects in materials and workmanship for a period of 13 months from date of purchase. The OMEGA ® W ARRANTY adds an additional one (1) month grace period to the normal one (1) year product warranty to cover handling and shipping time. This ensures that OMEGA ’ s custo ...
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Omega TX91 - page 36
Where Do I Find Everything I Need for Process Measurement and Control? O M EGA…Of Course! Shop online at omega.com TEMPERA TURE 䡺 ⻬ Thermocouple, RTD & Thermistor P r obes, Connectors, Panels & Assemblies 䡺 ⻬ W ire: Thermocouple, RTD & Thermistor 䡺 ⻬ Calibrators & Ice Point References 䡺 ⻬ Recorders, Controllers &am ...
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