Omega Products TX71 User Manual

The TX70 Series 2-wire transmitters for thermocouples
and RTD’s feature dip switch selection for input type
and range. With the thermocouple models, the user
may select from J, K or T input with one model, or E, R
or S with another. All models feature 80% zero and
span adjustability within any user-selected input range.
Models are available with any desired input, with either
a 4 to 20 mA or 10 to 50 mA output signal. To scale
the unit in the field, calibration equipment is required.

Ranging Example:

In the 0 to 500°C range for a Type K thermocouple
and a minimum span of 100°C, the user may select
any 100° span within that 0 to 500°C range, such as
14 to 114°C or 379 to 479°C.

Specifications

Maximum Lead Wire Effect: < 0.25/µV per Ω of

thermocouple resistance; 1% of span error with up to 40 Ω
per lead for RTD

Output Span: 4 to 20 mA or 10 to 50 mA, switch selectable
Minimum Output Current: 3.3 mA, typical
Max Output Current: 24 mA (20 mA range), 58 mA

(50 mA range)
Supply Voltage Range: 4 to 20 mA: 12 to 80 Vdc;
10 to 50 mA: 12 to 60 Vdc

Burnout Protection: Upscale
Max Change in Supply Voltage Effect: 0.05% of span
Max Change in Load Effect: 0.05% of span
Stability: Zero-within 0.02% of span/°C or 2µV, whichever is

greater; span-within 0.01% of span/°C

Accuracy: 0.5%, including linearity, hysteresis, stability
Zero and Span Adjustability: 80% of selected range
Repeatability: 0.05% of span
Response Time: 400 ms, max
Output Ripple: Less than 0.1% of span, rms
RFI Effect: Error less than 1% of span; 5 W, 470 MHz at 3"
Isolation: 600 Vdc or peak ac max, input to output
Operating Ambient Temperature: -40 to 80°C (-40 to 176°F)
Excitation Current, RTD: 1 mA, typical
Load: max load = (Vs-12)/0.02 for 20 mA range; (Vs-12)/0.05

for 50 mA range

Notes: The TX70 series requires thermocouple or RTD input simulation
to scale the output for a particular temperature range. To order unit
scaled by OMEGA order TX-SCALED, $45, and specify (1) input type,
(2) low end of range, (3) high end of range (specify C or F).
Thermocouple model output proportional to mV output of thermocouple.
Not linearized to temperature.
Ordering Example: TX71 isolated transmitter, TX-SCALED, scaling
charge, calibrated for Type J thermocouple with range of 100 to 400°C,
$463 + 46 = $509. OCW-3 OMEGACARESMextends standard 1-year
warranty to a total of 4 years ($115), $463 + 115 = $578.

To Order

(Specify Model Number)

Model No. Price Description
TX71 $463 J, K, T input; isolated
TX73 463 E, R, S input; isolated
TX75 425 RTD input; isolated

Model No. Price Description

HEP-TX70* $85 Explosion resistant head
TX70-RM 50 Mounting ring
TX-SCALED 45 Scaling charge

Options

(Additional Protection Heads available on page B-7)

Model No. Price Description
HEP-TX71-(*) $633 TX71 in explosion resistant

housing with 1⁄4" OD, 12" long, (K,
J, T) ungrounded thermocouple
probe with 1⁄2 NPT, TX70-RM

HEP-TX73-E 633 TX73 in explosion resistant

housing with 1⁄4" OD, 12" long,
(E) ungrounded thermocouple
probe with 1⁄2 NPT, TX70-RM

HEP-TX75 655 TX75 in explosion resistant housing

with 1⁄4" OD, 12" long, 100 Ω
platinum RTD probe, TX70-RM

Accessories

(*) Add thermocouple Type J, K, or T.
Ordering Example: HEP-TX71-J, TX71 explosion resistant housing

and 12" ungrounded thermocouple, 1⁄4" OD, J Type probe with

1

⁄2NPT, TX-SCALED, for J, 0 to 300°C, $633 + 45 = $678.

Two-Wire Transmitters

TX70 Series

Starts at

$

425

* Requires mounting ring, TX70-RM.

Model Input Maximum Min. Maximum Min.

No. Type Range °F Span Range °C Span

0 to 900°F 200°F 0 to 500°C 100°C

0 to 1400°F 300°F 0 to 760°C 150°C

-350 to 1100°F 350°F -200 to 600°C 200°C
0 to 900°F 200°F 0 to 500°C 100°C

TX71 0 to 1900°F 400°F 0 to 1000°C 200°C

0 to 2500°F 500°F 0 to 1370°C 300°C

-450 to 900°F 400°F -270 to 500°C 200°C
0 to 750°F 150°F 0 to 400°C 100°C

-450 to 750°F 350°F -270 to 400°C 200°C
0 to 300°F 60°F 0 to 150°C 30°C

0 to 600°F 120°F 0 to 300°C 60°C
0 to 950°F 200°F 0 to 500°C 100°C

0 to 1800°F 400°F 0 to 1000°C 200°C

TX73 -450 to 0°F 160°F -270 to 0°C 100°C

-340 to 300°F 200°F -270 to 150°C 150°C

-450 to 650°F 350°F -270 to 350°C 200°C

-450 to 1550°F 550°F -270 to 850°C 300°C
0 to 1700°F 400°F 0 to 950°C 220°C

0 to 3200°F 750°F 0 to 1760°C 450°C
0 to 1000°F 200°F 0 to 600°C 120°C

TX75 0 to 500°F 100°F 0 to 300°C 60°C

30 to 130°F* 20°F 0 to 50°C* 10°C

* Max Zero at 25°C (75°F)

/

MOST POPULAR MODEL HIGHLIGHTED!

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Additional power

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please see page

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N-19

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