OMEGA TXUN-ST 2 Wire Programmable Transmitter User Guide

OMEGA TXUN-ST 2 Wire Programmable Transmitter User Guide

Warning

2 Wire Programmable Transmitter TXUN-ST/FM

• RTD, TC, Ohm, or mV input
• Extremely high measurement accuracy
• 1.5 kVAC galvanic isolation
• Programmable sensor error value
• For DIN form B sensor head mounting
• TXUN-FM is the FM approval version of TXUN-ST

Application

• Linearised temperature measurement with Pt100…Pt1000, Ni100…Ni1000, or TC sensor.
• Conversion of linear resistance variation to a standard analogue current signal, for instance from valves or Ohmic level sensors.
• Amplification of a bipolar mV signal to a standard 4…20 mA current signal.

Technical characteristics

• Within a few seconds the user can program TXUN-ST to measure temperatures within all ranges defined by the norms.
• The RTD and resistance inputs have cable compensation for 2-, 3- and 4 wire connection.
• Continuous check of vital stored data for safety reasons.

Mounting/installation

For DIN form B sensor head mounting. In non-hazardous areas the TXUN-ST can be mounted on a DIN rail.

Applications

Electrical specifications

• Specifications range: -40°C to +85°C

• Common specifications: Supply voltage, DC

• Standard: 7.2…35 VDC

• CSA, FM, ATEX, IECEx & INMETRO:  7.2…30 VDC Internal power dissipation

• Standard: 25 mW…0.8 W
  CSA, FM, ATEX, IECEx & INMETRO………….. 25 mW…0.7 W

• Voltage drop: 7.2 VDC
  Isolation voltage, test / operation 1.5 kVAC / 50 VAC

• Warm-up time: 5 min

• Communications interface: Loop Link

• Signal / noise ratio: Min. 60 dB

• Response time (programmable): 1…60 s

• EEprom error check: < 3.5 s

• Signal dynamics, input: 20 bit

• Signal dynamics, output: 16 bit

• Calibration temperature: 20…28°C
  Accuracy, the greater of general and basic values:

General values

Input type| Absolute

accuracy

| Temperature

coefficient

All| £ ±0.05% of span| £ ±0.01% of span / °C
Basic values

Input type| Basic accuracy| Temperature coefficient
RTD| £ ±0.2°C| £ ±0.01°C/°C
Lin. R| £ ±0.1 W| £ ±10 mW / °C
Volt| £ ±10 µV| £ ±1 µV / °C
TC type:

E, J, K, L, N, T, U

| £ ±1°C| £ ±0.05°C / °C
TC type: B, R, S, W3, W5, LR| £ ±2°C| £ ±0.2°C / °C

Electrical Specifications

Inputs and Specs

EMC immunity influence: < ±0.5% of span
Extended EMC immunity: NAMUR NE 21, A criterion, burst ……… < ±1% of span.

• Effect of supply voltage variation : < 0.005% of span/VDC

• Vibration: IEC 60068-2-6 : 2007
  2…25 Hz: ±1.6 mm
  25…100 Hz: ±4 g

• Max. wire size: 1 x 1.5 mm2 stranded wire

• Screw terminal torque: 0.4 Nm

• Humidity: < 95% RH (non-cond.)

• Dimensions: Ø 44 x 20.2 mm Protection degree (enclosure / terminal): IP68/IP00

• Weight: 50 g

Electrical specifications, input:
RTD and linear resistance input:

RTD

type

| Min. value| Max. value| Min. span| Standard
---|---|---|---|---
Pt100| -200°C| +850°C| 25°C| IEC 60751
Ni100| -60°C| +250°C| 25°C| DIN 43760
Lin. R| 0 W| 5000 W| 30 W| —–

• Max. offset: 50% of selec. max. value
• Cable resistance per wire (max.): 5 Ω
• Sensor current: nom. 0.2 mA
• Effect of sensor cable resistance (3- / 4-wire): < 0.002 Ω/Ω
• Sensor error detection: Yes

TC Input

Type| Min. temperature| Max. temperature| Min. span| Standard
---|---|---|---|---
B| +400°C| +1820°C| 100°C| IEC584
E| -100°C| +1000°C| 50°C| IEC584
J| -100°C| +1200°C| 50°C| IEC584
K| -180°C| +1372°C| 50°C| IEC584
L| -100°C| +900°C| 50°C| DIN 43710
N| -180°C| +1300°C| 50°C| IEC584
R| -50°C| +1760°C| 100°C| IEC584
S| -50°C| +1760°C| 100°C| IEC584
T| -200°C| +400°C| 50°C| IEC584
U| -200°C| +600°C| 50°C| DIN 43710
W3| 0°C| +2300°C| 100°C| ASTM E988-90
W5| 0°C| +2300°C| 100°C| ASTM E988-90
LR| -200°C| +800°C| 50°C| GOST 3044-84

• Max. offset: 50% of select. max. value

• Cold junction compensation: < ±1.0°C

• Sensor error detection: Yes
  Sensor error current:

• When detecting: Nom. 33 mA

• Else: 0 mA

Voltage input:

• Measurement range: -12…800 mV
• Min. span: 5 mV
• Max. offset: 50% of select. max. value
• Input resistance: 10 MΩ

Output

Current output:

• Signal range: 4…20 mA
• Min. signal range: 16 mA
• Updating time: 440 ms
• Output signal at EEprom error: ≤ 3.5 mA
• Load resistance: ≤ (V supply – 7.2) / 0.023 [Ω]
• Load stability: < ±0.01% of span / 100 Ω

Sensor error detection:

• Programmable: 3.5…23 mA
• Namur NE43 Upscale: 23 mA
• Namur NE43 Downscale: 3.5 mA

Of span = Of the presently selected range

Approvals:

• EMC: 2014/30/EU
• CCOE: P337392/1
• RoHS: 2011/65/EU
• EAC: TR-CU 020/2011
• FM certificate: FM17US0013X

Connections

Input:

Output :

Block Diagram

Programming

• Loop Link is a communications interface that is needed for programming TXUN-ST/FM.
• For programming please refer to the drawing below and the help functions in OMset.
• Loop link is not approved for communication with modules installed in harzardous (Ex) areas.

Mechanical Specifications

APPENDIX

FM INSTALLATION DRAWING – TXUN-FM

FM Installation Drawing TXUN-FM

FM Installation Drawing

Model TXUN-FM

Hazardous (Classified) Location

Class I,Division1, Groups, A,B,C,D T4..T6
Class I, Zone 0, AEx ia IIC T4..T6

Ambient temperature limits
T4: -40 to + 85 deg. Celcius
T6: -40 to + 60 deg. Celcius

Terminal 1 , 2
Vmax or Ui: 30 V
Imax or Ii: 120 mA
Pmax or Pi: 0.84 W
Ci: 1 nF
Li:10 uH

Terminal 3,4,5,6
Vt or Uo: 9.6 V
It or Io: 28 mA
Pt or Po: 67.2 mW
Ca or Co: 3.5 uF
La or Lo: 35 mH

Hazardous

Temperature limits
T4: -40 to + 85 deg. Celcius
T6: -40 to + 60 deg.

Q502

The entity concept
The Transmitter must be installed according to National Electrical Code (ANSI- NFPA 70) and shall be installed with the enclosure, mounting, and spacing segregation requirement of the ultimate application.

Equipment that is FM-approved for intrinsic safety may be connected to barriers based on the ENTITY CONCEPT. This concept permits interconnection of approved transmitters, meters and other devices in combinations which have not been specifically examined by FM, provided that the agency’s criteria are met. The combination is then intrinsically safe, if the entity concept is acceptable to the authority having jurisdiction over the installation.

The entity concept criteria are as follows:

The intrinsically safe devices, other than barriers, must not be a source of power. The maximum voltage Ui(VMAX) and current Ii(IMAX), and maximum power Pi(Pmax), which the device can receive and remain intrinsically safe, must be equal to or greater than the voltage (Uo or VOC or Vt) and current (Io or ISC or It) and the power Po which can be delivered by the barrier.

The sum of the maximum unprotected capacitance (Ci) for each intrinsically device and the interconnecting wiring must be less than the capacitance (Ca) which can be safely connected to the barrier.

The sum of the maximum unprotected inductance (Li) for each intrinsically device and the interconnecting wiring must be less than the inductance (La) which can be safely connected to the barrier.

The entity parameters Uo,VOC or Vt and Io,ISC or It, and Ca and La for barriers are provided by the barrier manufacturer.
NI Field Circuit Parameters

Model TXUN-FM

Hazardous (Classified) Location

Class I,Division2, Groups, A,B,C,D T4..T6
Class I, Zone 2, IIC T4..T6

Ambient temperature limits
T4: -40 to + 85 deg. Celcius
T6: -40 to + 60 deg. Celcius

Terminal 1 , 2
Vmax : 35 V
Ci: 1.0 nF
Li:10 uH

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. OMEGA’s WARRANTY 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 customers receive maximum coverage on each product. If the unit malfunctions, it must be returned to the factory for evaluation. OMEGA’s Customer Service 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. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidence of having been damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification; misapplication; misuse or other operating conditions outside of OMEGA’s control. Components in which wear is not warranted, include but are not limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various products. However, OMEGA neither assumes responsibility for any omissions or errors nor assumes liability for any damages that result from the use of its products in accordance with information provided by OMEGA, either verbal or written. OMEGA warrants only that the parts manufactured by the company will be as specified and free of defects. OMEGA MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive, and the total liability of OMEGA with respect to this order, whether based on contract, warranty, negligence, indemnification, strict liability or otherwise, shall not exceed the purchase price of the component upon which liability is based. In no event shall OMEGA be liable for consequential, incidental or special damages.

CONDITIONS: Equipment sold by OMEGA is not intended to be used, nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), used in or with any nuclear installation or activity; or (2) in medical applications or used on humans. Should any Product(s) be used in or with any nuclear installation or activity, medical application, used on humans, or misused in any way, OMEGA assumes no responsibility as set forth in our basic WARRANTY/DISCLAIMER language, and, additionally, purchaser will indemnify OMEGA and hold OMEGA harmless from any liability or damage whatsoever arising out of the use of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA Customer Service Department. BEFORE RETURNING ANY PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR number should then be marked on the outside of the return package and on any correspondence.

The purchaser is responsible for shipping charges, freight, insurance and proper packaging to prevent breakage in transit.

FOR WARRANTY RETURNS, please have the following information available BEFORE contacting OMEGA:

1. Purchase Order number under which the product was PURCHASED,
2. Model and serial number of the product under warranty, and
3. Repair instructions and/or specific problems relative to the product

FOR NON-WARRANTY REPAIRS, consult OMEGA for current repair charges. Have the following information available BEFORE contacting OMEGA:

1. Purchase Order number to cover the COST of the repair,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, whenever an improvement is possible. This affords our customers the latest in technology and engineering.

OMEGA is a trademark of OMEGA ENGINEERING, INC.
© Copyright 2018 OMEGA ENGINEERING, INC. All rights reserved. This document may not be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or in part, without the prior written consent of OMEGA ENGINEERING, INC.

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References

• Omega Engineering | Sensing, Monitoring and Control Solutions
• Global Presence | Omega Engineering
• Omega Engineering | Sensing, Monitoring and Control Solutions
• Signal conditioning devices for process industry

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