Emerson Liebert SL-31080 User Manual

T
EMPERATURE
Description
The THW420 combination
temperature/humidity transmitter
is designed to meet applications
that require local indication of both
temperature and humidity in a
single, aesthetically pleasing
enclosure.
This device incorporates a 10K ohm
(Ω) platinum RTD. The transmitter
requires 24 VDC. The sensor provides an
accurate and predictable four-wire, 4-20 mA
output signal for temperature and a second
4-20 mA output signal for humidity.
Dimensions
FRONT
VIEW
4.5"
(1143mm)
2.25"
(572mm)
2.75"
(699mm)
TOP VIEW

Specifications

Output
Sensor
Supply Voltage
Tolerance of Resistance
(Accuracy)
Response Time
Environmental Operating
Range (Transmitter)

Ordering Information

Quantity Part #
THW420
SL-31080 Product Specification/Installation Sheet
/H
UMIDITY
0.95"
(241mm)
Wall
0.75"
(191mm)
SIDE
VIEW
4 to 20 mA
10K Ω platinum RTD
24 VDC
±1.5°F (±0.83°C)
±2% RH (from 15 to 95% RH)
20 seconds for a 63% step
45°F to 96°F; 0 to 100% RH
(7°C to 35°C); 0 to 100% RH
Combination Temperature/Humidity Transmitter Wall 4-20 mA @ 45°F to 96°F and 0 to 100% RH
T
RANSMITTER
Termination
The THW420 transmitter must be powered from a
24 VDC supply. The combination temperature/
humidity sensor is terminated as follows:
• The humidity transmitter requires a three-wire
termination for the 4-20mA output using 24 VDC.
• The temperature sensor also requires a three-
wire termination. In most cases, it obtains power
from the analog input to which it is connected and
no external power is required.
Though interference from external sources is not a
major problem with current transmitters, Liebert
recommends separating the wiring from line voltage
wiring and from wiring used to supply highly induc-
tive loads such as motors, generators and coils. Lie-
bert also recommends making power connections
with twisted pair wire of at least 22 AWG and crimp-
type connectors.
SW2 OUTPUT SELECT
ON
4-20ma Ch1
4-20ma Ch2
RESIST. Ch3
RUN %RH
SW2
DISPLAY CYCLE
IN SECONDS
10
3
T
POT1
Building Automation
U3
RTH1 RTH2
Terminations
CAUTION
!
Liebert recommends wiring the sensor
WITHOUT power applied because
accidental arcing may damage the product
and will void the warranty.
Description
page 1
- W (4-20
ALL
To GND (common)
of controller*
0-5V
From +24VDC
0-5V
of controller or
power supply
0-5V
To controller's
CAL
analog input
(temperature signal,
4-20mA)
To controller's
C9
analog input
X
(humidity signal,
4-20mA)
J2
* NOTE:
J3
The GND (common)
20
terminal is common
H
between the Power
and Sensor
T&B
Products, Inc.
SWITCH
Copyright 2000
REV. 101600
XCOMBO T&B
Short
J1
Norm
Open
+24VDC should be
SW1
used at all times
A)
M
Controller
Ground
4-20 mA
Input #1
+
-
4-20 mA
Input #2
+
-
6/03 (Rev. 0)