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Ultra-Miniature Temperature
Transmitters
Thermocouple or
RTD (Pt100)
TX93A/TX94A
U ±0.1% FS Accuracy
U 4 to 20 mA DC Output
U Only 35.6 mm (1.4") Dia
U Upscale Break Protection
U J, K, T, or E
Thermocouple Input
U 100 Ω Platinum RTD Input
OMEGATM ultra-miniature
temperature transmitters convert
millivolt inputs from thermocouples
or resistance from RTDs into 4 to
20 mA outputs. Transmitters are
available in color-coded enclosures
covering the four most popular
thermocouple Types
(J, K, T, and E) as well as 3-wire
100 Ω Platinum RTDs.
Featuring state-of-the-art integrated
circuits and electronic design, these
ultra-compact transmitters have a
diameter of only 35.6 mm (1.40")
and are designed to fit inside many
compact thermowell protection
heads, such as the OMEGA NB2.
OMEGA also provides complete
thermocouple and RTD assemblies.
TX93A and TX94A transmitters can
eliminate long runs of costly field
wiring in a variety of applications.
A stable 4 to 20 mA output signal
is produced proportional to the
transmitter’s specific input type
and calibrated temperature range
(see Range Code table, right).
Adjustability of ±25% for zero and
span is provided to facilitate some
rangeability. The transmitted signal
eliminates noise pickup, voltage drops,
and multiple cold junction errors, and it
requires only a twisted pair of copper
wires for loop connections
Specifications
Output Range: 4 to 20 mA dc
Zero and Span Adjustment Range:
±25%
Accuracy: ±0.1% FS (includes effects
of linearity, hysteresis and repeatability)
Transmitter
inside!
Actual size.
Frequency Response: 3 dB @ 3Hz
Ambient Temp. Range:
-25 to 85°C (-13 to 185°F)
Storage Temp. Range:
-65 to 125°C (-85 to 257°F)
Supply Voltage: 8 to 35 Vdc;
24 Vdc recommended
Max Loop Vs – 8V
Resistance: 0.020 A
Dimensions:
23.6 H x 35.6 mm D (0.93 x 1.40")
(height includes terminal strip)
Weight: 15 g (0.53 oz), 25 g (0.8 oz)
if epoxy-potted
To Order
6.35 (0.250)
3.96 (0.156)
for #6-32 SCREW
2 PLCS
12.19 (0.480) 12.19 (0.480)
23.6 (0.93)
MAX
Dimensions: mm (inch)
35.6 (1.40)
13.2 (0.52)
Model No. Description
TX93A-(*) Thermocouple transmitter (J, K, T or E)
TX93A-(*)-P Thermocouple transmitter, fully epoxy-potted electronics
for extreme environments
TX94A-(*) RTD transmitter (100 Ω Pt, alpha = 0.00385)
TX94A-(*)-P RTD transmitter, fully epoxy-potted electronics for
extreme environments
NB2TX93A-(*) TX93A mounted into a NB2 aluminum protection head,
with 12" ungrounded probe (J, K, T, E), 304 SS sheath,
1
⁄4" diameter
PRTX94A-(*)
TX94A mounted into a PR14 miniature aluminum protection
head, with 12" sheath length, 1⁄4
" probe diameter
-FS Special factory scaling
Insert range code from chart below.
*
Range Codes
TX93A TX94A Range
J K T E RTD °C (°F)
J1 E1 1 -40 to 49 (-40 to 120)
J2 K2 T2 E2 2 -18 to 93 (0 to 200)
J3 K3 T3 E3 3 -18 to 149 (0 to 300)
J4 K4 T4 E4 4 -18 to 260 (0 to 500)
J5 K5 T5 E5 5 -18 to 399 (0 to 750)
J6 K6 E6 6 -18 to 538 (0 to 1000)
Notes: (1) Thermocouple models, output proportional to mV output of thermocouple.
Not linearized to temperature. (2) Non-isolated unit for use with ungrounded probes. (3) Each unit
supplied with complete operator’s manual.
Ordering Example: TX93A-J4, Type J, transmitter with -18 to 260°C (0 to 500°F) range.
NB1TXA-J8, specifies a Type J transmitter assembly, with 0 to 150°C range.
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