Omega | TX94 | Owner Manual | Omega TX94 Owner Manual

Omega TX94 Owner Manual
User’s Guide
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RTD Temperature Transmitter
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TABLE OF
CONTENTS
TX94
RTD Two-Wire Temperature Transmitter
Page
Section 1 Introduction
1
1.1 General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 Models Available . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Section 2 Unpacking Instructions
9
Section 3 Installation
10
3.1 Mounting the TX94 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2 Wiring the TX94 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
0i
TABLE OF
CONTENTS
Section 4
4.1
4.2
Section 5
Section 6
Section 7
ii
TX94
RTD Two-Wire Temperature Transmitter
Page
Calibration Instructions
18
Equipment Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Troubleshooting Guide
23
Accessories
25
Specifications
26
1
Introduction
1.1 General Description
The OMEGA® TX94 Two-Wire RTD Transmitter will produce a standard
4-20 mA output signal proportional to that produced by its RTD input
temperature sensor. Transmission of the proportional current output
may be accomplished by using inexpensive copper wire. The TX94 RTD
Transmitter accepts two-wire or three-wire Ohm Platinum RTD sensors
. (PT100, alpha = 0.00385).
NOTE
Older units only accept two wire RTD’s. See wiring diagram on label on
actual unit.
01
1
2
Introduction
Figure 1-1 TX94 Transmitter
Figure 1-2 Dimensions (in inches)
Introduction
1
The TX94 transmitter is normally powered by an unregulated
power supply as shown in Figure 1-3. The proportionallytransmitted 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 temperature ranges
available for the TX94 transmitter. To order, refer to Section 1.3
for correct Model Numbers and Range Codes.)
03
1
Introduction
NOTE
Older units
may accept
two wire RTD’s
only.
Figure 1-3 TX94 RTD Transmitter
4
Introduction
1
The TX94 two-wire transmitter works with 2-wire or 3-wire RTDs and
provides an output current of 4-20 mA proportional to the RTD Sensor. When
the transmitter is mounted inside a protection head (such as the OMEGA NB1
Protection Head) two copper wires now carry the temperature signal and dc
voltage to operate the transmitter, thereby reducing possible noise pick-up
errors. The TX94 does NOT provide isolation between its input and the 4-20
mA output. Note, however, that the RTD element is electrically insulated.
05
1
Introduction
1.2 Features
• 4-20 mA output
• Ⳳ0.1% full-scale accuracy (with respect to
the RTD input resistance)
• Upscale break protection
• Low Cost
6
Introduction
1
1.3 Models Available
Table 1-1. Range Code
RANGE
-40 to 120°F
INPUT TYPES
RANGE
RTD
50/85°F
01
RTD
71
0 to 200°F
02
0/100°F
72
0 to 300°F
03
20/120°F
73
0 to 500°F
04
0/150°D
74
0 to 750°F
05
0/200°C
75
0 to 1000°F
06
30/100°F
76
07
1
Introduction
TX94 Models Available
Model Number
Description
TX94-(*)
RTD transmitter (100Ω, Pt, alpha = 0.00385)
PRTX94-(*)
PR-12 RTD probe, 12" L, 1/4" O.D.,
304SS sheath
*Insert range code from Table 1-1
For complete information on PR-12 RTD Probes, see
the OMEGA Temperature Handbook.
8
2
Unpacking Instructions
Remove the Packing List and verify that you have received all equipment, including:
• TX94 RTD Two-Wire Temperature Transmitter
• Operator’s Manual
If you have any questions about the shipment, please call the Customer Service
Department.
When you receive the shipment, inspect the container and equipment for signs of
damage. Note any evidence of rough handling in transit. Immediately report any
damage to the shipping agent.
NOTE
The carrier will not honor damage claims unless all shipping material
is saved for inspection. After examining and removing contents, save
packing material and carton in the event reshipment is necessary.
09
3
Installation
3.1 Mounting the TX94
The TX94 transmitter may be:
1. surface mounted,
2. mounted inside a protection head (refer to Figure 3-1), or
3. installed into the OMEGA mounting track (part number RT)
using an OMEGA mounting bracket (part number TX90-BR).
4. installed into standard 35mm DIN rail using an OMEGA
DIN rail mounting adapter (part number TX-90-DIN).
10
Figure 3-2 shows the RT mounting track. Figure 3-3 shows the
TX90-BR mounting bracket.
Installation
3
Figure 3-4 shows a typical installation using the bracket and
mounting track. Figure 3-5 shows the TX90-DIN adapter.
Figure 3-1 Assembly of the Transmitter inside an
OMEGA NB1 Protection Head (Dimensions in inches)
11
3
Installation
NOTE
Hand tighten
transmitter
mounting
screws only.
Do not
overtighten.
Figure 3-2 RT Mounting Track (Dimensions in inches)
12
Installation
Figure 3-3 TX90-BR Mounting Bracket (Dimensions in inches)
3
13
3
Installation
Figure 3-4 Installation with the Bracket and Track (Dimensions in inches)
14
Installation
3
Figure 3-5 TX 90-DIN DIN Rail Mounting Adapter (Dimensions in inches)
15
3
Installation
3.2 Wiring the TX94 (Refer to Figure 3-6)
1. 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.
2. Connect the RTD element to the input terminals as shown.
16
Installation
3
O
N
Figure 3-6 Wiring Diagram for the TX 94
NOTE
Older units may accept 2-wire RTDs only
17
4
Calibration Instructions
4.1 Equipment Required
• Precision Decade Resistance Box, with 0.01 ohm resolution and
Ⳳ0.02 ohm accuracy or
• Precision RTD Simulator, such as the OMEGA Model CL511
Precision Calibrator
• Precision DMM capable of measuring mA, within 0.001 mA
resolution and Ⳳ0.002 mA accuracy
18
Calibration Instructions
4
4.2 Calibration Procedures (Refer to Figure 4-1)
Connect the calibration equipment according to Figure 4-1.
Standard copper test leads are used with RTD instrumentation.
To check or adjust the calibration:
1. Locate the Z (zero) and S (span) potentiometers.
2. Select, from Table 4-1, the correct ohmic values for the Z (zero)
and S (span) adjustments that correspond to the Model
Number. For example, for Model TX94-2, the Z value is 93.04
ohms, and the S value is 135.97 ohms.
19
4
Calibration Instructions
If a Thermocouple/RTD Simulator is used, such as the OMEGA
Model CL511 Precision Calibrator, select the Temperature Input
Z (zero) and S (span) values.
3. Set the decade box to the selected Z (zero) ohmic value.
Adjust the Z potentiometer to read 4.000 mA on the
monitoring instrument.
4. Set the decade box to the selected S (span) ohmic value.
Adjust the S potentiometer to read 20.000 mA on the
monitoring instrument.
5. Repeat steps 3 and 4, as required, until the readings are exactly
4.000 mA and 20.000 mA. This procedure is necessary since
there is interaction between the two potentiometers.
20
Calibration Instructions
4
Figure 4-1 TX94 RTD Calibration Set-Up
NOTE
Older units may accept 2-wire RTDs only
21
4
Calibration Instructions
Table 4-1. Calibration Values for the TX94
Temperature
Input Range
Zero/Span
Model
TX94
Resistance Input (Ohms)
Alpha = 0.00385
Zero/Span
Temperature
Input Range
Zero/Span
Model
TX94
Resistance Input (Ohms)
Alpha = 0.00385
Zero/Span
-40/120°F
-1
84.27/118.97
50/85°F
-71
103.90/111.46
0/1200°F
-2
93.04/135.97
0/100°F
-72
93.04/114.68
0/1300°F
-3
93.04/156.90
20/120°F
-73
84.27/118.97
0/1500°F
-4
93.04/197.69
0/150°F
-74
93.04/125.37
0/1750°F
-5
93.04/246.65
0/200°C
-75
93.04/175.84
0/1000°F
-6
93.04/293.39
30/100°F
-76
99.57/114.68
22
5
Troubleshooting Guide
Malfunction or incorrect operation may be caused by:
1. Incorrect Readings:
Check for improper wiring (Refer to Figure 3-6)
2. Loose or broken wires:
Check each terminal connection for tightness. Move each wire
back and forth and note any changes in operation.
3. Too high a load resistance in the output current loop or too
low a current rating on the power supply:
23
5
Troubleshooting Guide
a) Measure the total resistance of each device (excluding the
transmitter and power supply) in the 20 mA loop, including
the resistance of the lead wires.
b) Calculate maximum allowable loop resistance using the
formula: Loop Resistance (maximum) = Vsupply –8V
0.020A
For example, a 24V power supply would give a maximum loop
resistance of: 16V/0.020A = 800 ohms.
24
c) Make sure the power supply is rated for at least 28 mA
times the number of TX94 transmitters being powered. For
example, if the supply is powering five transmitters, the
supply should be rated for at least 140 mA.
6
Accessories
Model No.
Description
TX90-BR
Mounting Bracket
PSU-24B
Unregulated Power Supply, 24 Volts
TX828
Process Loop-Powered Indicator
RT
48" Mounting Track
TX90-DIN
DIN Rail Mounting Adapter
RAIL -35-2
6.5' Section 35mm DIN Rail
25
7
Specifications
General
Size:
1.75" dia. X 0.75" high (includes terminal strip)
Zero/Span Adjustment
Range:
±20%
Power Supply Voltage
Operating Range:
+8 Vdc to +35 Vdc, 28 mA max required
per transmitter
Accuracy:
26
±0.1% of full scale (includes effects of hysteresis,
repeatability and linearity proportional to the T/C)
Specifications
Frequency Response:
Ambient Temperature:
Storage Temperature
Range:
Thermal Zero Shift:
Thermal Span Shift:
Weight:
7
2dB@ 3Hz
-13°F to 185°F (-25°C to 85°C)
-85°F to 257°F (-65°C to 125°C)
<0.01%/°F of span (span >10 mV)
<0.02%/°F of span (4-10 mV span)
<0.01%/°F of span
1.0 oz (28g)
Output
Current Output Span:
4-20 mA dc
27
7
Specifications
Current Output
Limits:
Maximum Loop
Resistance:
Load Resistance Effect:
Power Supply Effect:
3 to 28 mA, typical
(Vsupply – 8V)/0.020A = ohms
0.01% of span per 300 ohms change
0.002% of output span per volt
Input
28
Sensor:
2 or 3-wire RTD
Maximum Bridge
Current:
2 mA
Notes
7
29
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® 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
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