Dwyer Instruments HT Series Operating Instructions

*Duct Mount unit shown.

DESCRIPTION

Monitor and control relative humidity and temperature in
building energy management systems with the Series HT
Humidity Temperature Transmitter. Designed for demanding
HVAC/EMCS applications, the Series HT provides ±3% RH
accuracy and ±1% stability per year. Routine calibration is
not required with the fully interchangeable sensor. Two-wire
connections allow easy installation directly into air ducts or
within a controlled area.

INSTALLATION

Mounting
The duct mount models must be mounted as described
below:
1. Drill four 1/8 (3.2 mm) diameter holes for the mounting
screws in the locations shown in Figure 1.
2. Cut a 0.866 (22 mm) diameter hole in the duct for the
sensor in the location shown in Figure 1.
3. Attach the duct mounting bracket to the duct with the
four screws provided.
4. Slide the sensor/transmitter assembly through the
center hole in the mounting bracket and secure into
place by tightening the screw located on the side of the
raised square portion of the mounting bracket.
Reminder: Remove the yellow sensor protection cap
before installing the sensor into your duct.
1.65
[42]
1.65
[42]
FIGURE 1: Drilling Dimensions for Duct Mount Units
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, ,U.S.A.
SERIES HT RH/Temperature Transmitter
Specifications – Installation and Operating Instructions
Ø.125 [3.2]
Tapping Screw
DIN 7981
Ø 0.866 [22] min
1-1/2
3-5/32
[38.10]
[80.17]
3-5/32
[80.17]

PHYSICAL DATA

Relative Humidity Range: 10 to 90% RH.
Temperature Range: Duct mount: -40 to 140˚F (-40 to 60˚C), wall
mount: 23 to 131˚F (-5 to 55˚C).
Accuracy: ±3% RH @ 25˚C; ±0.3˚C @ 25˚C.
Stability: ±2% RH over 2 years.
RH Temperature Dependence: <±1.5% RH from 14 to 140˚ (-10
to 60˚C).
Temperature Dependence: 0.01˚C/˚C.
Temperature Sensor: Pt 1000Ω RTD.
Response Time: 15 seconds.
Output Signal: 4 to 20 mA.
Supply Voltage: 10 to 28 VDC.
Current Consumption: 4 mA minimum.
Operating Humidity Range: Duct mount: 0 to 100%, wall mount:
0 to 90%.
Operating Temperature Range: Duct mount: 14 to 140˚F (-10 to
60˚C), wall mount: 23 to 131˚F (-5 to 55˚C).
Storage Temperature Range: -40 to 140˚F (-40 to 60˚C).
Conduit Connection: 1 / NPT.
2
Mounting Connection: 3 /
4
Housing Material: ABS plastic.
Enclosure: Duct mount only/IP65.
Weight: 0.6 lb (0.3 kg).

SERIES HT RH/TEMPERATURE TRANSMITTERS

Model
Number
HT00* Humidity Transmitter, wall mount
HT01 Humidity Transmitter, duct mount
HT10* Humidity/Temp Transmitter, wall mount
HT11 Humidity/Temp Transmitter, duct mount
*Wall mount not shown

Accessories

No. HT5, Replacement Humidity Sensor
No. HT6, Replacement Pt1000Ω RTD
Phone: 219/879-8000
Fax: 219/872-9057
Lit-By Fax: 888/891-4963
BULLETIN E-90-HT
11-5/8 [295.3]
2-1/8
8-1/2 [215.9]
[53.98]
15/32 DIA.
19/32 DIA.
[11.91]
[15.09]
NPT.
Description
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