
Relative Humidity/Temperature
Transmitters
For Duct or Wall Mounting
HX94ACW
$
245
†
ptional
O
⻬ Accurate to ±2.5%
Relative Humidity
and ±0.6°C (±1°F)
Temperature
⻬ Provides Independent
Analog Outputs for Both
Humidity and Temperature
Measurement
⻬ Stainless Steel
NEMA 4 (IP66) Housing
⻬ 3 Different Output
Connection Styles
Available
⻬ Models with 4 to 20 mA or
0 to 1 Vdc Outputs
⻬ Removable Stainless Steel
Sensor Filter
⻬ Includes Hardware for
Wall and Duct Mounting
⻬ Standard Models Include
Cable and Connector Pair
†
Refer to ordering chart on next page for
NIST calibration ordering information.
HX94AC, $275, shown much
smaller than actual size.
Connector pair included with
models HX94AC and HX94AV only.
The HX94A relative humidity/
temperature transmitter provides
a reliable and low cost method for
duct or wall mount monitoring
applications. Solid state sensors
provide excellent sensitivity, fast
response, and stability.
All models include mounting kit,
shown above.
Simple hookup and linearized
output permit interfacing with most
display and control devices like
meters, controllers, recorders, and
data loggers. The design features
a rugged stainless steel NEMA 4
(IP66) housing.
MODELS AVAILABLE WITH THREE DIFFERENT CONNECTION STYLES SHOWN BELOW!
Standard connector model. “W” and “NPT” models
come with stripped leads.
Hu-21
NPT fitting model
with stripped leads.

1.0 m
(3.0')
CABLE
4-PIN
CONNECTOR
1
9 (0.75) dia.
25.4 to 227
(1 to 9)
VARIABLE
DEPTH
FLANGE
R
EMOVABLE
S
TAINLESS STEEL
F
ILTER CAP
254 (10.0)
Dimensions:
4
3
2
1
+
*R2
*
R1
PROBE
C
ONNECTOR
*R1 and R2 CAN
COMBINE IN
ONE WIRE PLUS
J
UMPER PINS 1 AND 2
T
EMP.
M
ETER
OR
RECORDER
R
H METER
OR
R
ECORDER
6-30 VDC
POWER
S
UPPLY
R LOAD R LOAD
MAX R LINES = (V SUPPLY-6)/0.02
F
or 1 to 5 Volt Output, R Load = 250 Ohm
-
+
-
+
-
4
3
2
1
+
PROBE
C
ONNECTOR
TEMP.
M
ETER
O
R
RECORDER
RH METER
OR
R
ECORDER
6
-30 Vdc
POWER
S
UPPLY
-
+
-
+
-
mm (in)
Specifications
Relative Humidity
hin-film polymer capacitor
T
ower: 6 to 24 Vdc (polarity protected)
P
Measurement Range: 3 to 95% RH
Accuracy: ±2.5% @ 22°C (72ºF) from
20 to 80% RH; ±3.1% @ 22°C (72ºF)
below 20 and above 80% RH; with an
added temperature coefficient error of
±0.1% RH/°F (both increasing and
decreasing in temperature)
Repeatability: ±1% RH
Temperature Compensation:
-20 to 85°C (-4 to 185°F)
Current Output:
Voltage Output:
Time Constant: (for 90% response at
25°C; in moving air, 1m/sec)
Temperature
Thin-film 100 Ω Platinum RTD
(DIN 43760)
Input Voltage Range:
6 to 24 Vdc (polarity protected)
Range: 0 to 100°C (32 to 212°F)
Accuracy: ±0.6°C (±1°F)
Repeatability: ±0.3°C (±0.5°F)
Current Output:
Voltage Output:
Time Constant: (for 60% response)
Less than 2 seconds in moving air
(1m/sec), less than 10 seconds in still air
Mechanical
Housing: 316 SS NEMA 4
(IP66) enclosure
Probe: 254 x 19 mm dia. (10 x 0.75"),
305 mm (12") cable
Duct Flange: Removable, variable
25.4 to 227 mm (1 to 9") depth. 70 mm
(2.75") dia., duct hole 21 mm (0.812")
dia. 4 mtg holes 4 mm (0.156") dia.
(for #6 sheet metal screws) on 51 mm
(2.00") dia. circle; wall mounting
bracket included
Connections:
Weight: 198 g (7 oz) with duct flange
HX94AC: 4 to 20 mA (0 to 100% RH)
HX94AV: 0 to 1.0 V (0 to 100% RH)
Less than 20 Seconds: 10 to 90% RH
Less than 30 Seconds: 90 to 10% RH
HX94AC: 4 to 20 mA for 0 to 100°C
HX94AV: 0 to 1.0 V for 0 to 100°C
HX94AC/94AV: 4 pin mating
connector accepts 26 to 18 AWG wires
HX94ACW/94AVW: 1 m (3') braided
and shielded cable, PVC sheathing
HX94ACNPT/94AVNPT:
conductor with 1 m (3') braided and
shielded cable
1
⁄2" male NPT
Voltage Connector Models
Current Connector Models
Lead Wire Models
Models: HX94ACW, HX94ACNPT
(2-Wire Current Output with
stripped leads)
Relative Humidity:
White Wire: + Power supply
Green Wire: 4 to 20 mA output
Bare Wire: Shield, earth ground
Temperature:
Black Wire: + Power supply
Red Wire: 4 to 20 mA output
Models: HX94AVW, HX94AVNPT
(3-Wire Voltage Output with
stripped leads)
Relative Humidity:
Black Wire: + Power supply
Green Wire: 0 to 1 Vdc putput
White Wire: - Power supply
Bare Wire: Shield, earth ground
Temperature:
Black Wire: + Power supply
Red Wire: 0 to 1 Vdc output
White Wire: - Power supply
MOST POPULAR MODELS HIGHLIGHTED!
To Order (Specify Model Number)
Model No. Price Description
HX94AC $275 RH/temp transmitter with 4 to 20 mA outputs with
HX94AV 275 RH/temp transmitter with 0 to 1 Vdc outputs with
HX94ACW 245 RH/temp transmitter with 4 to 20 mA outputs with
HX94AVW 245 RH/temp transmitter with 0 to 1 Vdc outputs with
HX94ACNPT 255 RH/temp transmitter with 4 to 20 mA outputs with
HX94AVNPT 255 RH/temp transmitter with 0 to 1 Vdc outputs with
HX94-MC 10 Spare 4-pin mating connector
PSR-24S 60
PSR-24L 60
PSR-24L-230 60
TX4-100 35 4 conductor shielded transmitter cable, 30 m (100')
CAL-3-HU
Comes complete with mating connector (models HX94AC and HX94AV only), removable
†
protective sensor filter, removable duct flange, wall mounting bracket, and operator’s manual.
Ordering Example: HX94AC, duct mount RH/temperature transmitter with 4 to 20 mA output, $275.
Hu-22
4-pin connector
4-pin connector
1 m (3') lead wires
1 m (3') lead wires
1
⁄2" male NPT fitting and 1 m (3') leads
1
⁄2" male NPT fitting and 1 m (3') leads
Regulated power supply, US plug, 90 to 264 Vac input,
24 Vdc output, 400 mA, screw terminals, UL
Regulated power supply, US plug, 90 to 264 Vac input,
24 Vdc output, 400 mA, stripped leads, UL
Regulated power supply, European plug, 230 Vac input,
24 Vdc output, 400 mA, stripped leads, CE
125 NIST-traceable calibration
H
u

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