elsner elektronik 30170 Technical Specifications And Installation Instructions

EN
TH-AP Modbus
Indoor and outdoor sensor
Technical specifications and installation instructions
Item number
30170
1. Description
The Temperature and humidity sensor TH-AP Modbus measures temperature
and humidity in indoor and outdoor areas and calculates the dew point.
The devices are Modbus slaves with a RS485 interface and a RTU protocol. The
Modbus master, such as PC, SPS or MC can read the Temperature and humidity
sensor TH-AP Modbus measurement values with "Function 04h (Read Input Re-
gister)".
Functions:
• Temperature measurement
• Humidity measurement
• Dewpoint calculation
Notes on dew point calculation:
The TH-AP Modbus calculates the dew point of the ambient air. This value can be
used for dew point monitoring. This would require another sensor for measuring
the surface temperature of the wall or pipe. Also, the dew point needs to be moni-
tored (compare with temperatures) in the Modbus master.
Monitoring predetermines the possible condensate build-up on the surface, giving
a chance for timely countermeasures.
1.0.1. Scope of delivery
• Sensor in on-wall housing
1.1. Technical specifications
Housing Plastic, Sensor sleeve metall
Color Grey
Assembly Surface mounting
Protection category Housing: IP65
Exterior sensor: IP43
Dimensions approx. 65 × 91 × 38 (W × H × D, mm)
Weight approx. 77 g
Ambient temperature Operation -40...+80°C, Storage -40...+85°C,
Operating voltage 24 V DC ±10%.
An appropriate power supply unit can be pur-
chased from Elsner Elektronik
Cable cross-section
Massive conductors of up to 0,8 mm
Current max. 15 mA
Interface RS485
Protocol RTU
RS485 bus load 1/8 unit load according to RS485 standard
RS485 driver perfor- min. 2.4 V at 54 Ohm bus load
mance (corresponds to 32 standard RS485 unit loads)
Measurement range -40...+80°C
temperature
Measurement range 0% rH ... 100% rH
humidity
The product conforms with the provisions of EU directives.
2. Installation and start-up
Installation, testing, operational start-up and troubleshooting should
only be performed by an authorised electrician.
CAUTION!
Live voltage!
• Inspect the device for damage before installation. Only put undamaged
devices into operation.
• Comply with the locally applicable directives, regulations and provisions for
electrical installation.
• Immediately take the device or system out of service and secure it against
unintentional switch-on if risk-free operation is no longer guaranteed.
Temperature and humidity sensor TH-AP Modbus • Version: 26.06.2023 • Technical changes and errors excepted. • Elsner Elektronik GmbH • Sohlengrund 16 • 75395 Ostelsheim • Germany • www.elsner-elektronik.de • Technical Service: +49 (0) 7033 / 30945-250
Temperature and humidity sensor TH-AP Modbus
2
Use the device exclusively for building automation and observe the operating inst-
ructions. Improper use, modifications to the device or failure to observe the opera-
ting instructions will invalidate any warranty or guarantee claims.
Operate the device only as a fixed-site installation, i.e. only in assembled condition
and after conclusion of all installation and operational start-up tasks, and only in the
surroundings designated for it.
Elsner Elektronik is not liable for any changes in norms and standards which may
occur after publication of these operating instructions.
2.1. Location
The sensor is designed for surface mounting. When selecting an installation loca-
tion, please ensure that the measurement results are affected as little as possible by
external influences. Possible sources of interference include:
• Direct sunlight
• Drafts from windows and doors
• Warming or cooling of the building structure on which the sensor is mounted,
e.g. due to sunlight, heating or cold water pipes
• Connection lines which lead from warmer or colder areas to the sensor
For outdoor installation it must be ensured that a 60 cm gap is left below the sensor
in order to prevent it from being snowed during snowfall.
The sensor must be mounted vertically. The measurement probe and the cable out-
let must point downwards.
2.2. Notes on mounting and commissioning
Do not open the temperature sensor if penetration of water (rain) is likely: Only a
couple of drops could damage the electronic.
Do not dip the measuring tip (metal sleeve with sensor) in water.
2.3. Mounting and connection
2.3.1. Device Design
ATTENTION!
Make sure the connection is correct!
• Connect the power supply to 1 and 2 only.
• Use the data connections A and B exclusively for Modbus.
1
2
3
4
5
6
2.4. Bus communication
2.4.1. Bus load
The RS485 transceiver used has 1/8 of a standard RS485 bus load (1/8 unit load) and
can manage at least a 2.4 V at 54 Ohm bus load. It can, thus, operate a bus with 32
nodes at standard bus load. If nodes with a lower load than the standard bus load
are connected to an RS485 bus, the bus can be operated with more nodes. If, for
example, only nodes with 1/8 bus load are connected, up to 32 x 8 = 256 nodes can
be connected to the bus.
Fig. 1 Opened casing, board
1 Connecting plug, suitable for
massive
conductors of up to 0.8 mm²
1: 24 V DC (+)
2: GND (-)
Data line A: Modbus D0
Data line B: Modbus D1
The reference potential for data
lines is GND (-) of the power
supply.
2 LEDs
„Green": Power / operating vol-
tage.
„Red": Error / sensor error or er-
roneous data.
„Yellow: Com / bus communica-
tion.
3 DIP switch for interface parame-
ters
(see detailed view)
4 DIP switch for slave address
(see detailed view)
5 Cable feed with screw joint
6 Sensor tip
Fig. 2 Rear view with dimensioning
of
openings for mounting
1