PCD DIGITAL Differential pressure probe

Transcription

1 Differential pressure probe 2016 ROTRONIC AG Bassersdorf Switzerland

2 Contents 1 Overview Hardware and software compatibility Variants General information Power supply Measured parameters Digital interface Communication protocol Connector User settings Function overview Factory defaults Mechanical installation Electrical installation Maintenance Regular calibration Firmware update Technical specifications Accessories Additional documents Document version ROTRONIC AG Bassersdorf Switzerland Page 2 of 19

3 Scope: This manual is applicable to the PCD probe series with firmware version V1.x. The low-order digit of the firmware version stands for minor changes, e.g. correction of errors that do not influence the main functionality of the device. 1 Overview The PCD probe series is based on digital AirChip4000 technology. The probes have a UART interface. The PCD probe series is developed for use with all RMS data loggers. Compatible from firmware version RMS-LOG- 868 ( V1.5) and RMS-LOG-L ( V1.4). The PCD can be operated independently using the digital protocols, for example for integration into OEM applications. The following functions are available via the digital interface: o Change device settings o Differential pressure adjustment o Simulator mode With the firmware update for the PCD, it is possible at any time to enable the latest PCD functions, even on older devices. 1.1 Hardware and software compatibility The PCD is compatible only with RMS-generation devices. To change the PCD device configuration, the RMS- CONFIG software is required ROTRONIC AG Bassersdorf Switzerland Page 3 of 19

4 2 Variants The PCD comes in two variants. Variant 1: Thermal mass flow measurement principle (order code: PCD-S-Fxx) In this measurement technique, a heating element is placed between two temperature sensitive resistors. Due to a gas flow, the temperature profile is moved towards one of the resistors, which can be measured and evaluated. Sensor features: o 0 point compensation integrated. o Temperature compensation integrated. o Ambient pressure compensation (pressure sensor within the probe). Variant 2: Membrane measurement principle (order code: PCD-S-Mxx) In this measurement technique, the pressure is converted into a force, which stretches a diaphragm and is measured by a piezo-resistive MEMS membrane sensor. Sensor features: o Sensor adjustment required after installation. o Temperature compensation integrated. o Ambient pressure compensation not necessary. The PCD can be connected directly to a PC or network. Suitable accessories can be found in the E-M-HC2- accessories manual. Climate measurements PCD-S-Fxx Sensor: Thermal mass flow Leak rate: <180 µl/min Accuracy: ±1% full scale Long term stability: <0.3% of measured value/year Zero point compensation: Automatic (1 x per measurement interval) Temperature compensation: Yes Ambient pressure compensation: Automatic Pressure resistance: 5 bar Range of application pressure: ±25/50/100/250/500Pa Range of application temperature: C Range of application humidity: 0 95%rh (non condensing) Diameter: 32 mm Length: 87 mm Housing material: Polycarbonate, anthracite Weight: 60g 2016 ROTRONIC AG Bassersdorf Switzerland Page 4 of 19

5 PCD-S-Mxx Sensor: Membrane Leak rate: N/A Accuracy: ±1% full scale Long term stability: <0.3% of measured value/year Zero point compensation: Manual Temperature compensation: Yes Ambient pressure compensation: Not necessary Pressure resistance: 0.7 bar Range of application pressure: ±25/50/100/250/500Pa Range of application temperature: C Range of application humidity: 0 95%rh (non condensing) Diameter: 32 mm Length: 87 mm Housing material: Polycarbonate, anthracite Weight: 60g 2016 ROTRONIC AG Bassersdorf Switzerland Page 5 of 19

6 3 General information 3.1 Power supply The clip is created to be used directly connected to and powered by a RMS LAN Logger. Alternative a AC3001 (3.3V or 5.5V) can be used. 3.2 Measured parameters The PCD measures differential pressure. 3.3 Digital interface The PCD probe has a UART interface, via which the probe can be addressed directly using the MODBUS protocol. To connect the probe to a PC, an AC3001 service cable is required (E-M-HC2-accessories). Using the ROTRONIC RMS-CONFIG software, the following functions are available via the UART interface. o Read out measurements o Probe information: name, serial number, calibration and adjustment information, etc. o Probe calibration and adjustment o Configuration o Firmware update 3.4 Communication protocol The probe can be addressed directly using the MODBUS protocol, to request the measured CO2 values. The parameters highlighted in yellow should be selected according to the table below. Command: (MSB first) Probe address Command ID Start address Number records 0x00 0x04 0x00 0x00 0x00 0x00 0x0000 of MODBUS-CRC 1 Probe address: 0 255, if '0' then all probes respond regardless of the address. Start address Number of records Return values 0x00 0x04 Serial number 0x Differential pressure 0x0000 0x00 0x02 Serial number 0x CRC calculation according to MODBUS standard 2016 ROTRONIC AG Bassersdorf Switzerland Page 6 of 19

7 Response: Probe address Command ID 0x00 0x04 0x00 Number of data bytes Data (4 10 bytes) 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 MODBUS CRC 0x0000 Data format: Serial number (unsigned int): Humidity (unsigned int): corresponding to %RH Temperature (signed int): corresponding to C Response in the event of an error: Probe address Error code MODBUS CRC 0x00 0x84 0x00 0x0000 Error codes 0x02 0x03 Description Start address and number of records invalid Number of records invalid Sensor faults: In the event of a short circuit or open circuit at the probe, a value of is output for the measured value concerned. Primary Tables Type Read / Write Coils / Registers Function Code 0x01 Read Coils Coils Bit Read/Write x05 Write Single Coil 0x0F Write Multiple Coils Discrete Inputs Bit Read Only x02 Read Discrete Inputs Input Registers 16-bit Read Only x04 Read Input Register 0x03 Read Holding Registers Holding Registers 16-bit Read/Write x06 Write Single Register 0x10 Write Multiple Registers Attention! Coils and registers in Modbus are addressed starting at zero. Therefore coils numbered 1 16 are addressed as 0 15 or registers numbered e.g. 10'001 10'016 are addressed as 10'000 10'015! 3.5 Connector All PCD probes use the same connector (male). Connection diagram (7-pin connector, male view: probe side) 2016 ROTRONIC AG Bassersdorf Switzerland Page 7 of 19

8 1) V+ 2) GND 3) UART RxD 4) UART TxD 5) UART TxD_EN 6) 7) GND Connection diagram (7-pin connector, controller side) 2016 ROTRONIC AG Bassersdorf Switzerland Page 8 of 19

9 4 User settings The probe is supplied with the factory configuration as described in section 4.2. Users can change this configuration as required. The probe also offers various functions which are described briefly here. 4.1 Function overview Calibration Functions Description o 1-point or up to 9-point differential pressure adjustment/calibration o Reset to the factory adjustment Differential pressure adjustment Note 1: 0 point correction. The 0 point correction is required for all membrane sensors, correction drift and system deviations. The correction is to be carried out after installation. In order to carry out the 0 point adjustment, the external pressure connectors are linked together with a short tube, creating a 0Pa differential pressure when no pressure is applied to the tube. The 1 point calibration and adjustment can then be carried out via the RMS-CONFIG or the RMS-WEB/CLD software. Simulator mode Filter Note 2: The data acquisition need to be executed in real time. Meaning that the pressure acquired must be applied at the same moment. Calibration values (e. g. a calibration table with index- and measured values done in a separate calibration procedure) cannot be used for a data acquisition at a later date. The reason is the missing pressure compensation data. Is used to output fixed values for differential pressure. The output value can be configured. The differential pressure probe has a low pass filter included to reduce noise on the measured value. Possible values are 0, 2, 4, 8, 16 (default). The value represents the number of measurements, which create the basis for the measurement filter (average calculation). This measurement and its average calculation is done within approximately 100 milliseconds. Due to the fast measurement, we advise to use the maximum filter of 16 (standard). The settings can only be configured via the RMS-CONFIG software and the AC3001 cable ROTRONIC AG Bassersdorf Switzerland Page 9 of 19

10 4.2 Factory defaults Configurable settings Unit of measurement (metric/english) Psychrometric calculation Communication protocol Factory default Metric None MODBUS MODBUS address 0 Device name PCD Functions Differential pressure adjustment Differential pressure measurement period Factory default Factory adjusted (Default the probe is adjusted at 5 points: -1*; -0.5*; 0*; +0.5*; +1* measurement range). *With -1 being the lowest measurement and +1 being the highest. 1s Differential pressure filter Filter enabled at 16 Differential pressure simulator Disabled 2016 ROTRONIC AG Bassersdorf Switzerland Page 10 of 19

11 5 Mechanical installation For best measurement results, observe the following points: o The membrane sensor requires a 0 point correction once installed. o The mass flow sensor carries out an automatic 0 point correction ROTRONIC AG Bassersdorf Switzerland Page 11 of 19

12 6 Electrical installation Use Rotronic extension cables. These allow a maximum length of 5 m ROTRONIC AG Bassersdorf Switzerland Page 12 of 19

13 7 Maintenance 7.1 Regular calibration PCD sensors have high long-term stability and do not require any additional calibration as supplied. The calibration period will depend on the customers standard operating procedures. Rotronic recommends a calibration every 12 months. Calibration or adjustment can be carried out using the RMS-CONFIG or RMS- CLD/WEB software ROTRONIC AG Bassersdorf Switzerland Page 13 of 19

14 8 Firmware update Firmware updates are available to download from the ROTRONIC website. The AC3001 cable can be used to connect the PCD probe to a PC (see E-M-HC2-accessories). Firmware updates can be carried out using the RMS-CONFIG or RMS-WEB/CLD software ROTRONIC AG Bassersdorf Switzerland Page 14 of 19

15 9 Technical specifications General Device type Range of application IP protection Differential pressure probe C / 0 95%RH (non condensing) (temperature compensation from 0 70 C) IP65 Power supply / connection Power supply (VDD) VDC ±0% Current consumption Polarity protection Battery life 30mA (mass flow sensor). 12mA (membrane) Mechanical protection 60 days with a 10s measurement interval (mass flow sensor) 350 days with a 60s measurement interval (mass flow sensor) 130 days with a 10s measurement interval (membrane sensor) 650 days with a 60s measurement interval (membrane sensor) Differential pressure measurement Sensor Mass flow Membrane Parameter Measurement range Resolution Measurement C ±3K Differential pressure ±25, ±50, ±100, ±250, ±500Pa 1 ppm ±1% Full scale Long term stability <0.3% of measured value/year Medium Air Air and non-aggressive gases 0 point correction Automatic (1 x per measurement interval) Manual Pressure resistance 5 bar 0.7 bar Leak rate <180µl/min N/A Start time / measurement interval Startup time Measurement interval Response time T63 <0.5 s >10 s <1 s Digital interface Type Protocol UART MODBUS 2016 ROTRONIC AG Bassersdorf Switzerland Page 15 of 19

16 Factory default Logic levels Maximum cable length Baud rate 19200, tolerance 2 % Parity: none Data bits: 8 Stop bits: 1 Flow control: none Logic 0: 0.4 V Logic 1: V 5 m General specifications Housing material Polycarbonate (housing) Thumb-screw material Stainless steel, DIN Weight Dimensions Pressure connections 60g Ø32mm x 87mm Tubing connector internal Ø4mm x 10mm Conformity EMC Directive: 2014/30/EU CE / EMC EN :2007 EN :2005 EN :2007+A1:2011+AC:2012 EN :2007+A1:2011 EN : 2013 Performance criterion: Fire protection class Soldering FDA/GAMP guidance Corresponds to UL94-V2 Lead free (RoHS Directive 2011/65/EU) Compatible Accepted environmental conditions Storage/transportation Range of application electronics C / 0 95%RH, non-condensing C / 0 95%RH, non-condensing 2016 ROTRONIC AG Bassersdorf Switzerland Page 16 of 19

17 10 Accessories All accessories for the PCD probe such as extension cables, adapters, calibration material, etc. are to be found in the manual E-M-HC2-accessories ROTRONIC AG Bassersdorf Switzerland Page 17 of 19

18 11 Additional documents Document name E-M-HC2-accessories Contents Accessory parts for probes and transmitters 2016 ROTRONIC AG Bassersdorf Switzerland Page 18 of 19

19 12 Document version Version Date Remarks V1_0 March 2018 First version 2016 ROTRONIC AG Bassersdorf Switzerland Page 19 of 19