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Isolated Miniature
Transmitters
TX31
U Ultra-Low Profile Design
U Multi-Range Selectable
U Galvanic Isolation
U Long Term Stability
U 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.
TX31 shown actual size.
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 and 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 to 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)
PSR-24L
shown smaller
than actual size.
SM
Extended Warranty
Program
SM
OMEGACARE
is available for models shown on this page.
Ask your sales respresentative for full details
when placing an order. OMEGACARESM
covers parts, labor and equivalent loaners.
extended warranty program
Low (°C) Upper (°C)
T/C-Type
Limit Limit
0 600
E 0 600
0 1000
T 0 400
R 0 1600
S 0 1600
B 0 1600
Specifications
(VLOOP = 24 VDC, TAMB =
23±2°C, R
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
LOAD = 250 Ω)
To Order
Model No. Description
TX31-(*) Temperature transmitter
PSR-24S Regulated power supply 24 Vdc, 400 mA,
screw terminal
PSR-24L Regulated power supply 24 Vdc, 400 mA,
stripped leads
PSU-93 Unregulated power supply, 16 to 23 Vdc,
300 mA max, screw terminal
(*) Insert thermocouple Type: J, E, K, T, R, S, and B, no additional charge.
Ordering Example: TX31-K, Type K temperature transmitter with a temperature range
of 0 to 1000°C.
OCW-3, OMEGACARESM extends standard 1-year warranty to a total of 4 years.
N-9
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