TREND HT-D User Manual

Duct Humidity and Temperature Sensors

Important: Retain these instructions

1 Unpacking

2 INSTALLATION

Installation Instructions

HT/D

HT/D Installation Instructions
TG200988

1

2

c

Dimensions

33 mm (1.3”)

Location

electronics

-5 °C
(23 °F)

-20 °C
(-4 °F)

0 °C
(32 °F)

V > 10 m/s, 33’/s

+50 °C
(122 °F)

+60 °C probe
(140 °F)

+40 °C measurement
(104 °F)

12 mm diam (0.47”)

263 mm (10.35”)

ba

HO

2

Protection :IP65

M16 gland

0 %RH

100 %RH
non-condensing

97 mm (3.82”)

H T / D

T r e n d C o n t r o l S y s t e m s

94 mm (3.7”)

H o r s h a m , U K

105 mm (4.31”)_

85 mm (3.35”) centres57 mm (2.74”)

Prepare duct

3

either for screwing directly to duct

Ø 15 mm (0.59”)

a

42.5 mm
(1.67”)

b

2 pilot holes

42.5 mm
(1.67”)

c

or for using optional mounting flange

a c

4 holes Ø 4 mm (0.16”)

HT/D Duct Humidity and Temperature Sensors Installation Instructions TG200988 Issue 1/A 30/01/08

45 mm

(1.77”)

Ø circle

Ø 23 mm

(0.91”)

e

b

foam washer

f

d

1

HT/D Installation Instructions

2 INSTALLATION (Continued)

Remove lid

4 5

a

b

Wire to Controller

7

HT/D

Remove Connector

I-P
I-N
TH
TH

Insert cable through gland

6

either use
flexible
conduit

or use M16
cable gland

IQ1 & IQ2

C (+24V)

} humidity

IN
C

} temperature

IN

terminate screens at IQ end

2 analog input channels

linked for current (I)

linked for thermistor (T)

N

N+1

IQ3

humidity

temperature

linked for current (I)

linked for thermistor (T)

0 (0V)
N (in)

I-P
I-N
TH
TH

+ (+24V)

0 (0V)
N+1 (in)
+ (+24V)

terminate screens at IQ end

HT/D/2%

IQ1 & IQ2

C (+24V)
I-P
I1N
I2N

IN

C (+24V)

IN

} humidity

} temperature

2 analog input channels

linked for current (I)

linked for current (I)

terminate screen at IQ end

N

temperature

N+1

IQ3

humidity

linked for current (I)

linked for current (I)

0 (0V)
N (in)

I-P
I1N
I2N

+ (+24V)

0 (0V)
N+1 (in)
+ (+24V)

terminate screen at IQ end

Note that when connecting to IQ3, in order to provide sufficient supply current to the sensor, the sensor I-P terminal must
be connected to both channels’ 24 V terminals.

Replace Connector

8

2

HT/D Duct Humidity and Temperature Sensors Installation Instructions TG200988 Issue 1/A 30/01/08

Replace Lid

9

Installation Instructions HT/D

2 INSTALLATION (Continued)

Mount Sensor

10

or if using optional mounting flange

either if screwing directly to duct

abadjust depth

b

2 x No 6 x 20 mm screws DIN 7481

Configure IQ

11

or

IQ

Set up IQ Sensor types

12

It is recommended to use SET (Software Tool) for the setting of the sensor type module. For all IQ2 series controllers with
firmware version 2.1 or greater, or IQ3 series controllers, the following SET Unique Sensor References should be used:

Humidity HT/D, HT/D/2% :Humidity I
Temperature HT/D/2% :PRT I 0+40 (°C)

Temperature HT/D :Thermistor HTST DT (°C)

PRT I +32+104 F (°F)

Thermistor HTST DT F (°F)

IQ

IQ Configuration Manual

90-1533

Alternatively set scaling mode to 5 (characterise) and enter scaling manually as defined in appropriate tables below. Note
that for IQ3 the scaling mode and exponent (E) do not need to be set up.
For all other IQ controllers see Sensor Scaling Reference Card TB100521A

Temperature (thermistor)
HT/D

(0 to +40 °C, 32 to 104 °F)

Test System

13

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64.40368

366.60105

866.7023

201.85-32

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Temperature (current)
HT/D/2%

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(0 to +40 °C, 32 to 104 °F)

Humidity (current)

HT/D and HT/D/2%

(0 to 100 %RH)

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Δ T

IQ

Δ H

3 FAULT FINDING

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HT/D Duct Humidity and Temperature Sensors Installation Instructions TG200988 Issue 1/A 30/01/08

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3

HT/D Installation Instructions

D O W N U P

4 MAINTENANCE

Over time, the sensing element may become covered in dust. The dust can be removed using compressed air. Under no
circumstances should water or cleansing agents be used on the sensing elements.

It is recommended that the accuracy of the sensor is verified every 12 months. If the sensor falls outside the quoted accuracy,
replace the filter and recalibrate as shown below

Replace filter

1

c ACC/HTD/FILTER d

Caution: Do not touch humidity sensing element

3

a

Remove lid

b

Caution: This unit contains static sensitive

damage to the units.
BS EN100015/1 Basic Specification: protection
of electrostatic sensitive devices.

devices. Suitable anti-static
precautions should be taken
throughtout the operation to prevent

Two point calibration

5

For calibration over whole working range

• Start calibration at lower humidity point.

• Difference between the two points should be >30%RH

Low Humidity Calibration

1 Remove lid from the calibration chamber (ACC/CAL/HT) and

clean chamber thoroughly.

2 Insert one of the cloths provided with the calibrating liquid. Pour

calibrating liquid (ACC/CAL/HT/35%) onto the fabric. Refit lid
and screw tightly.

3 Insert probe into sensor aperture of chamber and tighten collar to

provide air tight seal around the probe. Wait 30 min.
4 Press Down pushbutton for 3 s to start. LED will illuminate.
5 Press Up or Down pushbutton to adjust measured value in 0.1%

steps.
6 Either: Press Up pushbutton for 3 s to stop. Calibrated value

is stored. LED is extinguished.

Or: Press Down pushbutton for 3 s to exit calibration without

storing value. LED is extinguished.

High Humidity calibration

7 Remove lid from the calibration chamber (ACC/CAL/HT) and

clean chamber thoroughly.
8 Insert one of the cloths provided with the calibrating liquid. Pour

calibrating liquid (ACC/CAL/HT/80%) onto the fabric. Refit lid

and screw tightly.
9 Insert probe into sensor aperture of chamber and tighten collar

to provide air tight seal around the probe. Wait 30 min.
10 Press Up pushbutton for 3 secs to start. LED will illuminate.
11 Press Up or Down pushbutton to adjust measured value in 0.1% steps
12 Either: Press Up pushbutton for 3 s to stop. Calibrated value

is stored. LED is extinguished.

Or: Press Down pushbutton for 3 s to exit calibration without

storing value. LED is extinguished.

ba unscrew

See Section 5,
Disposal

• Keep sensor and humidity

• Place probe in humidity chamber

• Keep temperature constant

push
buttons

Preparation

2

chamber in same room for 4
hours before.

30 mins before.

during calibration.

Locate buttons

4

calibration
LED

One point calibration

6

For calibration over limited range about single point

• This calibration decreases accuracy over remainder of working range

Single Point Humidity Calibration

1 Remove lid from the calibration chamber (ACC/CAL/HT) and

clean chamber thoroughly.

2 Insert one of the cloths provided with the calibrating liquid. Pour

calibrating liquid (ACC/CAL/HT/35% or /80%) onto the fabric.
Refit lid and screw tightly.

3 Insert probe into sensor aperture of chamber and tighten collar to

provide air tight seal around the probe. Wait 30 min.

2 Either: (If chamber humidity >50%RH.) Press Up pushbutton

for 3 s to start. LED will illuminate.
Or: (If chamber humidity <50%RH.) Press Down pushbutton for

3 s to start. LED will illuminate.

3 Press Up or Down pushbutton to adjust measured value in 0.1%

steps

4 Either: Press Up pushbutton for 3 s to stop. Calibrated value

is stored. LED is extinguished.
Or: Press Down pushbutton for 3 s to exit calibration without

storing value. LED is extinguished.

Replace Lid

7

5 DISPOSAL

Test System

8

Δ T

IQ

Please send any comments on this or any other Trend technical publication to [e-mail]

Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Ecublens, Route du
Bois 37,Switzerland by its Authorized Representative, Trend Control Systems Limited.

©Trend Control Systems Limited 2007. Trend Control Systems Limited reserves the right to revise this publication from time to time and make
changes to the content hereof without obligation to notify any person of such revisions or changes.

Δ H

Do not dispose of with normal household waste. Do not burn.

WEEE Directive :

At the end of their useful life the packaging
and product should be disposed of by a
suitable recycling centre.

Trend Control Systems Limited

P.O. Box 34, Horsham, West Sussex, RH12 2YF, UK. Tel:[phone] Fax:[phone] www.trend-controls.com

Trend Control Systems USA

6670 185th Avenue NE, Redmond, Washington 98052, USA. Tel: [phone], Fax: [phone] www.trend-controls.com

4

HT/D Duct Humidity and Temperature Sensors Installation Instructions TG200988 Issue 1/A 30/01/08