Omega Products TX31-B User Manual

Isolated Miniature
Transmitters

TX31

$

195

⻬ Ultra-Low Profile Design
⻬ Multi-range Selectable
⻬ Galvanic Isolation
⻬ Long Term Stability
⻬ Cast Aluminum Housing

The Model TX31 is an analog,
isolated 2-wire head-mounted
temperature transmitter that
converts thermocouple input to the
voltage, which is generated by the
thermocouple sensor, linear, and
highly accurate 4 to 20 mA output
current. The transmitter comes in a
variety of applications such as
process control, automation system,
and energy source management.

The TX31 is performed by means
of a DIP-switch array for coarse
range setting, and 2 multi-turn
potentiometers (ZERO and SPAN)
which are used for the final fine­tuning. The TX31 is housed in a
metal enclosure with a plastic top
cover, fitting into DIN B connection
heads, providing excellent RFI
immunity. The TX31 accepts low­level signal from the thermocouple,
filtered, amplified, and converter
process current to reduce
susceptibility transients and noise
operations while allowing the same
2 wires to carry the transmitter
power and output current signal
simultaneously.

Specifications

(VLOOP = 24 VDC, TAMB =
23±2°C, R

LOAD = 250 Ω)

Output: 4 to 20 mA; Upscale < 26 mA,

Downscale <3.8 mA
Loop Power: 12 to 32 Vdc;

Reverse polarity protected

Input Thermocouple: J; E; K; T; R; S; B
Supply Voltage Effect: ±0.01%/V
Temperature Coefficient: ±0.02% /°C

(Tamb = 5 to 50°C )
Repeatability: ±0.01% of voltage

input span

Low (°C) Upper (°C)

T/C-Type

Limit Limit

J 0 600
E 0 600
K 0 1000
T 0 400
R 0 1600
S 0 1600
B 0 1600

To Order

(Specify Model Number)

Model Number Price Description
TX31-(*) $195 Temperature transmitter
PSR-24S 60 Regulated power supply 24 Vdc, 400 mA,

screw terminal

PSR-24L 60 Regulated power supply 24 Vdc, 400 mA,

stripped leads

PSU-93 40 Unregulated power supply, 16 to 23 Vdc,

300 mA max, screw terminal

OP-2 25 Reference Book: Temperature Measurement

in Engineering

(*) Insert thermocouple Type: J, E, K, T, R, S, and B.
Ordering Example: TX31-K, Type K temperature transmitter with a termperature range

of 0 to 1000°C, $195.

MOST POPULAR MODELS HIGHLIGHTED!

Linearity Error: ±0.1% of voltage
input span (not temperature input)

Galvanic Isolation: Input/output
1000 Vrms, continuous

Cold-Junction Compensation: ±2°C
max (Tamb = 5 to 50°C)

Load Capability: 50 x (loop power - 12)
Fine Adjustment: 5% of zero & span
RFI effect (5W, 470 MHz):

< ±10% of span

Response time (0 to 90%): 200 ms
Housing Material: Cast aluminum with

epoxy coating and polycarbonate,
UL94-V0 grade

Connection: M3, nickel coated brass;
22 - 12 AWG

Operation Environment: -20 to 70°C;
5 to 85 %, non-condensing

Dimensions: 27 H x 45 mm Dia.
(1.06 x 1.77")

Weight: 65 g (2.3 oz)

TX31, $195,

shown actual size.

N-9

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