Sentera Controls DSTHM-2 Service manual

Mounting and operating instructions

DSTHM-2 COMBINED T AND RH

DUCT TRANSMITTER

www.sentera.eu

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Table of contents

SAFETY AND PRECAUTIONS 3

PRODUCT DESCRIPTION 4

ARTICLE CODES 4

INTENDED AREA OF USE 4

TECHNICAL DATA 4

STANDARDS 4

OPERATIONAL DIAGRAMS 5

WIRING AND CONNECTIONS 5

MOUNTING & OPERATING INSTRUCTIONS IN STEPS 5

OPERATING INSTRUCTIONS 8

VERIFICATION OF INSTALLATION 9

TRANSPORT AND STOCK KEEPING INFORMATION 9

WARRANTY AND RESTRICTIONS 9

MAINTENANCE 9

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DUCT TRANSMITTER

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SAFETY AND PRECAUTIONS

Read all the information, the datasheet, Modbus map, mounting and operating

instructions and study the wiring and connection diagram before working with the

product. For personal and equipment safety, and for optimum product performance,

make sure you entirely understand the contents before installing, using, or maintaining

this product.

For safety and licensing (CE) reasons, unauthorised conversion and/ or modiﬁcations

of the product are inadmissible.

e product should not be exposed to abnormal conditions, such as: extreme

temperatures, direct sunlight or vibrations. Long-term exposure to chemical

vapours in high concentration can aﬀect the product performance. Make sure the

work environment is as dry as possible; avoid condensation.

All installations shall comply with local health and safety regulations and local

electrical standards and approved codes. is product can only be installed by an

engineer or a technician who has expert knowledge of the product and safety

precautions.

Avoid contacts with energised electrical parts. Always disconnect the power

supply before connecting, servicing or repairing the product.

Always verify that you apply appropriate power supply to the product and use

appropriate wire size and characteristics. Make sure that all the screws and nuts

are well tightened and fuses (if any) are ﬁtted well.

Recycling of equipment and packaging should be taken into consideration and these

should be disposed of in accordance with local and national legislation/regulations.

In case there are any questions that are not answered, please contact your

technical support or consult a professional.

DSTHM-2

COMBINED T AND RH

DUCT TRANSMITTER

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PRODUCT DESCRIPTION

e DSTHM-2 series are combined duct transmitters which measure temperature

and relative humidity. Based on the temperature and relative humidity measurements,

the dew point is calculated. ey are Power over Modbus supplied and all parameters

are accessible via Modbus RTU.

ARTICLE CODES

Code Supply Connection

DSTHM-2 Power over Modbus, 24 VDC RJ45

INTENDED AREA OF USE

Monitoring duct temperature and relative humidity in HVAC applications

TECHNICAL DATA

■Selectable temperature range: -30—70 °C

■Selectable relative humidity range: 0—100 %

■Accuracy: ±0,4 °C (range -30—70 °C); ±3 % rH (range 0—100 % rH)

■Maximum power consumption: 0,36 W

■Nominal power consumption in normal operation: 0,27 W

■Imax: 15 mA

■Minimum airﬂow velocity required: 1 m/s

■Enclosure and probe material:

►ASA, grey (RAL9002)

■Protection standard: enclosure: IP54, probe: IP20

■Typical ﬁeld of use:

►temperature: -30—70 °C

►rel. humidity: 0—100 % rH, (non-condensing)

■Storage temperature: -10—60 °C

STANDARDS

■EMC Directive 2014/30/EC:

►EN 61326-1:2013 Electrical equipment for measurement, control and laboratory

use - EMC requirements - Part 1: General requirements

►EN 61326-2-3:2013 Electrical equipment for measurement, control and

laboratory use - EMC requirements - Part 2-3: Particular requirements - Test

conﬁguration, operational conditions and performance criteria for transducers

with integrated or remote signal conditioning

■WEEE Direc tive 2012/19/EC

■RoHs Directive 2011/65/EC

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DUCT TRANSMITTER

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OPERATIONAL DIAGRAMS

Input register 1 [%]

100

-30 Min range Max range 70 T [°C]

Input register 10 [%]

100

0Min range Max range100 rH [%]

WIRING AND CONNECTIONS

RJ45 socket (Power over Modbus)

Pin 1 24 VDC Supply voltage

Pin 2

Pin 3 AModbus RTU communication, signal A

Pin 4

Pin 5 /B Modbus RTU communication, signal /B

Pin 6

Pin 7 GND Ground, supply voltage

Pin 8

GND

24 VDC

8 mm

RJ45

MOUNTING & OPERATING INSTRUCTIONS IN STEPS

Before you start mounting the unit, read carefully “Safety and Precautions”.

Follow these steps:

1. When preparing to mount the unit, bear in mind that the probe opening must

be positioned in the centre of the duct. Always use the ﬂange to install the

sensor on round ducts. It is possible to install the sensor without the ﬂange on

rectangular ducts (if necessary), see Fig. 1 and Fig. 2 below.

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DUCT TRANSMITTER

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Fig. 1 Mounting dimensions

With ﬂange Without ﬂange

Ø 12

2x Ø 5

86,8

18,5

42,3

285

Probe

opening

243

34,5

Ø 4,4

100

105

Fig. 2 Mounting position

Correct Incorrect

AIR

FLOW

AIR

FLOW

2. Having selected the appropriate mounting location, proceed with the following steps:

2.1 Drill a tight-sealing Ø 13 mm hole into the duct.

2.2 Fix the ﬂange onto the duct outer surface using the self-drilling screws

delivered with the unit. If you do not intend to use the ﬂange, insert the

probe and ﬁx the enclosure onto the duct. Mind the airﬂow direction (see

Fig. 2 and Fig. 3).

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DUCT TRANSMITTER

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Fig. 3 Mounting requirements

7,5*D(1)3,5*D

(1)D = Duct diameter

ATTENTION Installation requirements: e unit must not be installed in turbulent air zones. Ensure

suﬃciently long settling zones upstream and downstream of the tapping point. A

settling zone consists of a straight section of pipe or duct with no obstructions. Avoid

installation near ﬁlters, cooling coils, fans, etc. e sensor will achieve the optimal

result when the measurement is taken at least 7,5 duct diameters downstream and

at least 3 duct diameters upstream from any turns or ﬂow obstructions.

ATTENTION Installation of the unit near high EMI-emitting devices may lead to faulty

measurements. Use shielded wiring in areas with high EMI.

ATTENTION Keep at least 15 cm distance between the sensor lines and the 230 VAC power lines.

2.3 Install the probe at the desired depth and; in case you use the ﬂange, ﬁx it

via the plastic white screw in the ﬂexible ﬂange.

2.4 Unscrew the cover of the unit to remove it and insert the connecting cables

through the cable gland of theunit.

2.5 Crimp the RJ45 cable and plug it into the socket, see Fig.4 and section

“Wiring and connections”.

Fig. 4 Wiring and connections

3. Close the enclosure and secure it with the screws. Tighten the cable gland to

retain the IP rating of the enclosure.

4. Switch on the power supply.

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DUCT TRANSMITTER

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5. Customise the factory settings to the desired ones via the 3SModbus software

or Sensistant (if necessary). For the default factory setting, see the Modbus

For the complete Modbus register data, refer to the product Modbus Register

Map, which is a separate document attached to the article code on the website

and contains the registers list. Products with earlier ﬁrmware versions may not be

compatible with this list.

NOTE

Optional settings

To assure correct communication, the NBT needs to be activated in only two devices

on the Modbus RTU network. If necessary, enable the NBT resistor via 3SModbus or

Sensistant (Holding register 9).

Example 1 Example 2

ТX

NBT

Slave 2

Master

Slave n

Slave 1

Slave 2

Slave 1

ТX

NBT

Master

Slave n

NOTE On a Modbus RTU network, two bus terminators (NBTs) need to be activated.

CAUTION Do not expose to direct sunlight!

OPERATING INSTRUCTIONS

NOTE For detailed information and settings, refer to the product Modbus register map,

which is attached to the article code on our website.

Calibration procedure:

Sensor calibration is not necessary.

All sensor elements are calibrated and tested in our factory.

Bootloader:

anks to the bootloader functionality, the unit ﬁrmware can be updated via Modbus

RTU communication. With 3SM boot Application (part of 3SM center software

suite), ‘boot mode’ is automatically activated and the ﬁrmware can be updated.

NOTE Make sure the power supply does not get interrupted during “bootload” procedure,

otherwise you risk losing unsaved data.

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COMBINED T AND RH

DUCT TRANSMITTER

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VERIFICATION OF INSTALLATION

If your unit does not function as expected, please check the connections.

TRANSPORT AND STOCK KEEPING INFORMATION

Avoid shocks and extreme conditions; store in original packing.

WARRANTY AND RESTRICTIONS

Two years from the delivery date against defects in manufacturing. Any modiﬁcations

or alterations to the product after the date of publication relieve the manufacturer

of any responsibilities. e manufacturer bears no responsibility for any misprints or

mistakes in this data.

MAINTENANCE

In normal conditions this product is maintenance-free. If soiled, clean with a dry or

damp cloth. In case of heavy pollution, clean with a non-aggressive product. In these

circumstances the unit should be disconnected from the supply. Pay attention that

no ﬂuids enter the unit. Only reconnect it to the supply when it is completelydry.

DSTHM-2

COMBINED T AND RH

DUCT TRANSMITTER

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DSTHM-2

COMBINED T AND RH

DUCT TRANSMITTER

Table of contents

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