SplusS 814x-MB Humidity Temperature And Pressure Sensor Instruction Manual

SplusS 814x-MB Humidity Temperature And Pressure Sensor

Product Specifications

• Power Supply: < 0.2 W / 24 V DC typical
• Unit System: SI (default), Imperial
• Data Points: Modbus (RTU-Mode), Address range 0…247 adjustable
• Baud Rate: 9600, 19200, 38400 Baud
• Signal Filtering: 4 s / 32 s for Temperature / Humidity, 0 s / 1 s / 10 s for Pressure
• Temperature Range: See table
• Pressure Type: See table

Product Usage Instructions

Mounting and Installation

1. Ensure the power supply matches the specified requirements.
2. Mount the device using the plastic mounting flange included in the delivery package.
3. Connect the device using the provided connection set.
4. Secure the cable connection using the plastic cable gland (M16 x 1.5).

Data Configuration
Set the bus address and parameters (such as baud rate and parity) using the DIP switches on the device.

Sensor Calibration
Perform manual or automatic zero-point calibration for pressure measurements as needed.

Display and Controls
The device features LEDs for internal status indication, a reset button, and offset adjustment controls for pressure readings.

Frequently Asked Questions (FAQ)

• Q: What is the default unit system for the device?
  A: The default unit system is SI, but it can also be set to Imperial.

• Q: How do I calibrate the sensors on the device?
  A: You can perform manual or automatic zero-point calibration for pressure measurements.

• Q: What is included in the delivery package?
  A: The delivery package includes the device, mounting flange, connection set, and plastic cable gland for installation.

Operating and Mounting Instructions

Multifunctional duct sensors and measuring transducers for humidity, temperature, pressure, differential pressure and volume flow, incl. mounting flange and connection set, calibratable, with Modbus connection

Humidity & Temperature & Pressure Type 814x-MB

Dimensional drawing

ASD – 06

• Anschluss-Set (im Lieferumfang enthalten)
• Connection set (included in the scope of deliveryl)
• Kit de raccordement (compris dans la livraison)

SF -K
Kunststoff -Sinterfilter
Plastic sinter filter
Fitre fritté en matière synthétique

Type 814x-MB

Maintenance-free microprocessor-controlled Type 814x-MB (Series) with Modbus connection, in an impact-resistant plastic housing with quick-locking screws, connection nozzles for pressure hose (Ø 6 mm / 0.236 in), plastic sinter filter (exchangeable), to exactly detect the relative humidity (0…100% RH) and the temperature (–35…+80 °C / –31…+176 °F) in ducts and to measure the differential pressure (max. ± 7000 Pa / ± 28 inWC) in air. International system of units SI (default) can be switched to Imperial (via Modbus). Incl. mounting flange and connection set ASD-06 (2 m / 78.74 in connecting hose, two pressure port nipples, screws).
The pressure sensor is applied to measure positive, negative or differential pressure in clean air and gaseous media. It is used in the clean room, medical and filter technology, ventilation and air conditioning ducts, spray booths, large-scale catering facilities, for filter monitoring and level measurement or for triggering frequency converters.
A long-term stable, digital humidity and temperature sensor and a pressure sensor with piezoresistive measuring element guarantee exact measurement results. These measurands are used to internally calculate the following parameters that can be retrieved via Modbus: temperature, relative humidity, dew point, absolute humidity, mixture ratio, enthalpy (ignoring atmospheric air pressure), differential pressure, volume flow, air density.
Innovative Modbus sensor with galvanically separated RS485-Modbus-interface, selectable bus t ermination resistance, DIP switch for setting the bus parameters and bus address in current-free state, internal LEDs for telegram status display, two separate push-in terminals. The sensor is factory- calibrated; an environmental precision adjustment by an expert is possible.

TECHNICAL DATA

Switchable system of units

Type 814x – MB
Measuring transducers for humidity, temperature, pressure, differential pressure and volume flow

ACCESSOIRES

Type 814x-MB

TYPES OF MONITORING:

Pressure connections at the pressure switch are marked with

P1 (+) for higher pressure and
P2 (–) for lower pressure.

• (A) Below-atmospheric pressure
  • P1 (+) is not connected, but open to the atmosphere
  • P2 (–) connected to inside of duct
• (B) Filter
  • P1 (+) connected upstream of filter
  • P2 (–) connected downstream of filter
• (C) Ventilator
  • P1 (+) connected downstream of ventilator
  • P2 (–) connected upstream of ventilator
• (D) Volume flow
  • P1 (+) dynamic pressure, connected in flow direction
  • P2 (–) static pressure, connected free of  dynamic pressure components

Conversion table for pressure values

Manual zero point calibration (Pressure)

1. The device must be operative for at least 60 minutes before zero point setting is started.
2. Connect the two pressure inputs each P (+) and P (–) with a hose (differential pressure between the connections = 0).
3. To set the zero point, press the “auto zero” pushbutton for 10 seconds without interruption.

By pressing the pushbutton, a countdown of approx. 10 seconds is started. The yellow LED is blinking.
After the countdown period has elapsed, zero point calibration takes place. This is indicated by continuous LED light.

Note:
When releasing the pushbutton during countdown, zero point setting is immediately aborted!

Automatic zero point calibration (Pressure)

• A zero point calibration is carried out cyclically via an internal valve.
• The cycle time can be set between 15 minutes and 24 hours using the Register 4×0025.
• During the automatic calibration, the output value remains at its last pressure value.

Manual setting of the offset

• The sensors are pre-set and calibrated at the factory.
• Each measuring channel has a separate offset potentiometer for subsequent adjustment of the measurement.
• The adjusting range is ± 10 % of the measuring range (humidity / pressure) and approx. ± 5 K / 0.9 °F (temperature).

BUS ADDRESS

Bus address
(binary coded, value selectable from 1 to 247)

DIP 1| DIP 2| DIP 3| DIP 4| DIP 5| DIP 6| DIP 7| DIP 8
128| 64| 32| 16| 8| 4| 2| 1
O N| O N| OFF| OFF| OFF| OFF| OFF| O N
Example shows 128 + 64 + 1 = 193 as Modbus address.

The device address in the range of 1 to 247 is set at DIP switch [A].
For switch positions 1 to 8 see the table on the back!
Address 0 is reserved for broadcast messages.
Addresses greater than 247 must not be assigned and are ignored by the device. The DIP switches are binary-coded with the following values:

• DIP 1 = 128 ………… DIP 1 = ON
• DIP 2 = 64 ………… DIP 2 = ON
• DIP 3 = 32 ………… DIP 3 = OFF
• DIP 4 = 16 ………… DIP 4 = OFF
• DIP 5 = 8 ………… DIP 5 = OFF
• DIP 6 = 4 ………… DIP 6 = OFF
• DIP 7 = 2 ………… DIP 7 = OFF
• DIP 8 = 1 ………… DIP 8 = ON

The switch positions shown here result in the Modbus address 128 + 64 + 1 = 193

BUS PARAMETERS

Baud rate

(selectable)

| DIP 1| DIP 2
---|---|---
9600 baud| O N| OFF
19200 baud| O N| O N
38400 baud| OFF| O N
Reserved| OFF| OFF

Parity check
(on / off)| DIP 4
---|---
Active (1 stop bit)| O N
Inactive (no parity) (2 stop bits)| OFF
8N1 mode
(on / off)| DIP 5
---|---
Active| O N
Inactive (default)| OFF
Bus termination

(on/off)

| DIP 6
---|---
Active| O N
Inactive| OFF

The baud rate (speed of transmission) is set at DIP switches 1 and 2 of DIP switch block [B].
Selectable are 9600 baud, 19200 baud, or 38400 baud – see table!

• Parity is set at DIP switch 3 of DIP switch block [B].

• Selectable are EVEN or ODD – see table!

• Parity check is activated via DIP switch 4 of DIP switch block [B].

• Selectable are active (1 stop bit), or inactive (2 stop bits), i.e. no parity check – see table!
  The 8N1 mode is activated via DIP switch 5 of DIP switch block [B].

• The functionality of DIP switch 3 (parity) and DIP switch 4 (parity check) of DIP switch block [B] is therefore deactivated. Selectable are 8N1 active or inactive (default) – see table !.

• Bus termination is activated via DIP switch 6 of DIP switch block [B].

• Selectable are active (bus termination resistance of 120 Ohm), or inactive (no bus termination) – see table!

COMMUNICATION INDICATOR
Communication is indicated via two LEDs. Error-free received telegrams are signalized by the green LED lighting up, regardless of the device address. Faulty telegrams or triggered Modbus exception telegrams are depicted by the red LED lighting up.

DIAGNOSTICS
An error diagnostic function is integrated

TELEGRAMS
Function 04 Read Input Register

Function 05 Write Single Coil

Register| Parameter| Data Type| Value| Range|
---|---|---|---|---|---
0x0001| Auto zero (Differential pressure)| Bit 0| 0 / 1| OFF – ON|
0x0002| System of units| SI| →| Imperial| Bit 1| 0 / 1| SI (Default) –|
| | | Imperial|
Differential pressure| [Pa]| →| [inWC]|
| Volume flow| [m3/h]| →| [CFM]| | | |
| Temperature| [°C]| →| [°F]| | | |
| Relative humidity| [%RH]| | [%RH]| | | |
| Dew point| [°C]| →| [°F]| | | |
| Absolute humidity| [g/m3]| →| [gr/ft3]| | | |
| Mixing ratio| [g/kg]| →| [gr/ lb]| | | |
| Enthalpy| [kJ/kg]| →| [Btu/lb]| | | |
| Air density| [kg/m3]| →| [lb/ft3]| | | |

Function 06 Write Single Register & Function 16 Write Multiple Register

**Note*** (Register 4×0023, 4×0025, 4×0026)

The computed coefficients for the volume flow display are not saved in the permanent memory and are lost at zero voltage. They must be reset when the communication begins.

**Selection of the function type **** (Register 4×0024)

Function 08 Diagnostics
The following sub function codes are supported

(Reset listen-only mode)

| | Echo telegram
04| Activation listen-only mode| | No answer
10| Delete counter| | Echo telegram
11| Counter bus telegrams| Unsigned 16 Bit| All valid bus telegrams
12| Counter communication errors (Parity, CRC, frame errors, etc.)| Unsigned 16 Bit| Faulty bus telegrams
13| Counter exception telegrams| Unsigned 16 Bit| Error counter
14| Counter slave telegrams| Unsigned 16 Bit| Slave telegrams
15| Counter telegrams without answer| Unsigned 16 Bit| Broadcast messages (address 0)

Function 17 Report Slave ID
Composition of answer telegram

• Terminating resistor may only be installed at the ends of the bus line.
• In networks with repeaters not more than two line terminations are allowed.
• Line termination at the device can be activated via DIP switch 6.
• The bias resistors for bus level definition in the resting state are usually activated at the Modbus master / repeater.
• The maximum number of subscribers per Modbus segment is 32 devices.
• When the number of subscribers is greater, the bus must be subdivided into several segments separated by repeaters. The subscriber address can be set from 1 to 247.
• For the bus line, a twisted-pair cable data line / power supply line and copper mesh wire shield must be used. Therefore, the line capacitance should be less than 100 pF / m (e.g. Profibus cable).

Installation and Commissioning

Notes on installation:
Mounting shall take place while observing all relevant regulations and standards applicable for the place of measurement (e.g. such as welding instructions, etc.). Particularly the following shall be regarded:

• VDE ⁄ VDI directive technical temperature measurements, measurement set – up for temperature measurements.
• The EMC directives must be adhered to.
• It is imperative to avoid parallel laying of current-carrying lines.
• We recommend to use shielded cables with the shielding being attached at one side to the DDC ⁄ PLC.

Before mounting, make sure that the existing thermometer‘s technical parameters comply with the actual conditions at the place of utilization, in particular in respect of:

• Measuring range
• Permissible maximum pressure, flow velocity
• Installation length, tube dimensions
• Oscillations, vibrations, shocks are to be avoided (< 0.5 g)

Attention! In any case, please observe the mechanical and thermal load limits of the protective tubes according to DIN 43763 or according to specific S+S standards!

Flange mounting:
In case of flange mounting, screws in the flange part must be equally tightened. The lateral pressure screw must clamp securely, otherwise the feeler shaft might slip through.

Notes on commissioning:
This device was calibrated, adjusted and tested under standardised conditions.
When operating under deviating conditions, we recommend performing an initial manual adjustment on-site during commissioning and subsequently at regular intervals.
Commissioning is mandatory and may only be performed by qualified personnel!

General notes

Our “General Terms and Conditions for Business“ together with the “General Conditions for the Supply of Products and Services of the Electrical and Electronics Industry“ (ZVEI conditions) including supplementary clause “Extended Retention of Title“ apply as the exclusive terms and conditions.
In addition, the following points are to be observed:

• Devices must only be connected to safety extra-low voltage and under dead-voltage condition. To avoid damages and errors at the device (e.g. by voltage induction) shielded cables are to be used, laying parallel with current carrying lines is to be avoided, and EMC directives are to be observed.
• This device shall only be used for its intended purpose. Respective safety regulations issued by the VDE, the states, their control authorities, the TÜV and the local energy supply company must be observed. The purchaser has to adhere to the building and safety regulations and has to prevent perils of any kind.
• No warranties or liabilities will be assumed for defects and damages arising from improper use of this device.
• Consequential damages caused by a fault in this device are excluded from warranty or liability.
• These devices must be installed and commissioned by authorised specialists.
• The technical data and connecting conditions of the mounting and operating instructions delivered together with the device are exclusively valid. Deviations from the catalogue representation are not explicitly mentioned and are possible in terms of technical progress and continuous improvement of our products.
• In case of any modifications made by the user, all warranty claims are forfeited.
• This device must not be installed close to heat sources (e.g. radiators) or be exposed to their heat flow.
• Direct sun irradiation or heat i rradiation by similar sources (powerful lamps, halogen spotlights) must absolutely be avoided.
• Operating this device close to other devices that do not comply with EMC directives may influence functionality.
• This device must not be used for monitoring applications, which serve the purpose of protecting persons against hazards or injury, or as an EMERGENCY STOP switch for systems or machinery, or for any other similar safety-relevant purposes.
• Dimensions of enclosures or enclosure accessories may show slight tolerances on the specifications provided in these instructions.
• Modifications of these records are not permitted.
• In case of a complaint, only complete devices returned in original packing will be accepted.

These instructions must be read before installation and commissioning and all notes provided therein are to be regarded!
134r0065/002;1: Frozen :29-Jan-2024

© Copyright by S+S Regeltechnik GmbH
Nachdruck, auch auszugsweise, nur mit Genehmigung der S+S Regeltechnik GmbH.
Reprint in full or in parts requires permission from S+S Regeltechnik GmbH.

Bus address, binary coded

S+S REGELTECHNIK GMBH

• THURN-UND-TAXIS- STR. 22
• 90411 NÜRNBERG ⁄ GERMANY
• FON +49 (0) 911 ⁄ 5 19 47- 0
• [email protected]
• www.SplusS.de

References

• S+S Regeltechnik | Ihr sensorik Partner

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