Thermocouple Input
2-Wire Head-Mounted Transmitter
Model TX31
Cold- junction compensation
Multi-range selectable
Galvanic isolation
Long term stability
Competitive pricing
Descriptions
The Model TX31 is an analog, isolated 2-wire head-mounted temperature transmitter that
converter the thermocouple input into a proportional to the voltage generated by the
thermocouple sensor, linear, and highly accurate 4- 20 mA output current in a variety
applications such as process control, automation system, and energy source management.
The TX31 is performed by means of a 3 DIP-switch array for coarse range setting, and two
multi-turn potentiometers (ZERO & SPAN) which are used for the final fine-tuning. The unit
is housed in a metal enclosure with a plastic top cover, fitting into DIN B connection heads
providing excellent RFI immunity.The TX31 accepts low level signal from thermocouple,
filtered, amplified, and converter to process current to reduce susceptibility transients and
noise operations and allow the same two wires to carry the transmitter power and output
current signal simultaneously.
Specifications
(Vloop = 24 VDC, Tamb = 23 ± 2 deg C , Rload = 250 ohms)
Output: 4 - 20 mA; Upscale < 26 mA when T/C wire broken
Loop power:
12 - 32 Vdc. Reverse polarity protected,LED on indication
Input thermocouple: J; E; K; T; R; S; B; N
Supply voltage effect: ± 0.01%/V
Temperature coefficient: ± 0.02% /
¢J
(T amb = 5 to 50 deg C )
Repeatability: ± 0.01% of voltage input span
Linearity error: ± 0.1 % of voltage input span ( not temperature input)
Galvanic isolation: input/output 1000 Vrms, continuous
Cold-junction compensation: ± 2
¢J
max. (T amb = 5 to 50 deg C )
Load capability: 50 x (loop power - 12) ohms
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 Screw, nickel coated brass; AWG 12- 22
Operation environment: - 20 to 70
¢J
; 5 to 85 %, non-condensing
Dimensions: 45mm DIA. x 27mm H
Weight: 65 g
OMEGA ENGINEERING, INC.
