Related Manuals for GHM Delta OHM PMsense-M
Summary of Contents for GHM Delta OHM PMsense-M
- Page 1 English Operating manual PM / CO Transmitter PMsense Companies / Brands of GHM www.deltaohm.com Keep for future reference.
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Page 2: Table Of Contents
TABLE OF CONTENTS INTRODUCTION ..................3 TECHNICAL SPECIFICATIONS ..............4 INSTALLATION ..................5 3.1 E ................5 LECTRICAL CONNECTIONS CONFIGURATION AND MEASUREMENT ............. 8 PROPRIETARY PROTOCOL ................ 9 MODBUS-RTU PROTOCOL ................ 15 SAFETY INSTRUCTIONS ................20 ORDERING CODES .................. 21 PMsense V1.0... -
Page 3: Introduction
INTRODUCTION PMsense is a PM1.0, PM2.5 and PM10 Particulate Matter transmitter suitable for outdoor air quality monitoring. The dust particles concentration is measured using the laser scattering principle. An optional CO sensor can be integrated in the transmitter. The transmitter has a digital RS485 output with MODBUS-RTU or ASCII proprietary protocol. -
Page 4: Technical Specifications
TECHNICAL SPECIFICATIONS Particulate Matter Measuring principle Laser scattering Measured pollutants PM1.0, PM2.5 and PM10 Measuring range 0…1000 µg/m (for each pollutant) Particle size detection range ∅ 0.3…10 µm Linearity error < 5% Repeatability < 3% Sensor warm up time 15 s Sensor lifetime 5 years approx. -
Page 5: Installation
3 INSTALLATION The transmitter is equipped with a bracket with U-bolt for the fixing to a Ø40…50 mm mast. It can be fixed to a wall using the bracket only, by removing the U-bolt. Fixing bracket with U-bolt Air inlet Air outlet Connector Fig. - Page 6 Connector CPM12-8DA… Function pin N° wire color Power supply negative (GND) Blue Power supply positive (+Vdc) Not used RS485 A/- Brown RS485 B/+ White Digital and analog outputs ground (SGND)* Grey Analog output 1 positve (AOUT1, only PM[B]sense-A) Yellow Analog output 2 positve (AOUT2, only PM[B]sense-A) Green Cable shield ** Black (thick wire)
- Page 7 Current analog output (only PM[B]sense-A): By default, the current analog outputs are 4…20 mA, with: 4 mA = 0 ppm 20 mA = 1000 µg/m The analog output 1 is associated by default to PM2.5. The analog output 2 is associ- ated by default to PM10.
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Page 8: Configuration And Measurement
4 CONFIGURATION AND MEASUREMENT The configuration of the instrument and the reading of the measurements can be done via the RS485 serial output, both with the proprietary protocol and with the MODBUS- RTU protocol. In the first 10 seconds after the instrument power on, it is always active the proprie- tary protocol. -
Page 9: Proprietary Protocol
5 PROPRIETARY PROTOCOL To use the proprietary protocol, it is necessary to connect the instrument to the PC via a RS485/USB (e.g. RS51K) or RS485/RS232 converter and use a standard serial communication program. In the serial communication program, set the COM port number to which the instrument is connected and the communication parameters as follows: •... - Page 10 Note: after sending the DP1 command, the instrument remains with the proprietary protocol. Send the command SM to activate the MODBUS-RTU protocol immediately, or power cycle the instrument. RS485 communication parameters: Command Reply Description CMBn &| Sets the Baud Rate: ...
- Page 11 Command Reply Description CPSn &| Sets the type of measurement averaging for the contin- uous measurement mode: Average over a 10 seconds interval, updated every second if n=0 Average over a 60 seconds interval, updated every 10 seconds if n=1 ...
- Page 12 Command Reply Description CA1Hn &| Sets n as the maximum value of the measuring range of the physical quantity associated to the analog output 1. If the output is associated to PM, the value must be ex- pressed as a number of tenths (e.g. n=50 to indicate 5.0 µg/m ).
- Page 13 Command Reply Description CA2Hn &| Sets n as the maximum value of the measuring range of the physical quantity associated to the analog output 2. If the output is associated to PM, the value must be ex- pressed as a number of tenths (e.g. n=50 to indicate 5.0 µg/m ).
- Page 14 calibration (only PMBsense…): A 2-point (CO21 and CO22 commands) or 1-point calibration (CO2O command) can be performed. The points are chosen by the user. To perform the calibration, the transmitter must be placed in an environment with a known CO concentration.
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Page 15: Modbus-Rtu Protocol
6 MODBUS-RTU PROTOCOL By default, the instrument has MODBUS address 1 and communication parameters 19200, 8E1. The address and the communication parameters can be changed by using the appropriate serial commands of the proprietary protocol or, alternatively, directly with MODBUS commands by changing the value of the Coils and Holding Registers de- scribed later. - Page 16 PM2.5 in µg/m (x10). 16-bit Integer Measurement averaged over 10 s and updated every second. Available in continuous measurement mode. PM10 in µg/m (x10). 16-bit Integer Measurement averaged over 10 s and updated every second. Available in continuous measurement mode. PM1.0 in N°...
- Page 17 Internal board temperature (x10). 16-bit Integer Instrument firmware revision. The most significant byte 16-bit Integer indicates the major revision; the less significant byte indicates the minor revision. Number of MODBUS communication error. 16-bit Integer The measure is a 32-bit integer value. Two consecutive registers must be accessed to read the value.
- Page 18 Holding Registers: Number Address Description Format RS485 Baud Rate: 16-bit Integer 0=1200; 1=2400; 2=4800; 3=9600; 4=19200 (default); 5=38400; 6=57600; 7=115200. RS485 parity and stop bits: 16-bit Integer 0=8N1; 1=8N2; 2=8E1 (default); 3=8E2; 4=8O1; 5=8O2. [N=no parity, E=even parity, O=odd parity] Instrument address for the MODBUS-RTU protocol 16-bit Integer (1…247, default=1).
- Page 19 Number Address Description Format 12,13 11,12 Setting of the minimum value of the measuring range of 16-bit Integer the physical quantity associated to the analog output 2. If the output is associated to PM, the value is expressed as a number of tenths (e.g. 5 = 0.5 µg/m ).
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Page 20: Safety Instructions
SAFETY INSTRUCTIONS General safety instructions The instrument has been manufactured and tested in accordance with the safety standard EN61010-1:2010 “Safety requirements for electrical equipment for meas- urement, control and laboratory use” and has left the factory in perfect safety tech- nical conditions. -
Page 21: Ordering Codes
ORDERING CODES PMsense-M PM1.0, PM2.5 and PM10 transmitter. RS485 output with MOD- BUS-RTU or proprietary protocol. Supplied with mounting bracket and 8-pole female free connector. CPM12-8DA.x cable has to be ordered separately. PMBsense-M PM1.0, PM2.5, PM10 and CO transmitter. RS485 output with MODBUS-RTU or proprietary protocol. - Page 22 OTES PMsense V1.0...
- Page 24 G U A R A N T E E TERMS OF GUARANTEE All DELTA OHM instruments are subject to accurate testing, and are guaranteed for 24 months from the date of purchase. DELTA OHM will repair or replace free of charge the parts that, within the warranty period, shall be deemed non efficient according to its own judgement.
- Page 25 GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY Phone +39 049 8977150 | Fax +39 049 635596 www.deltaohm.com | info@deltaohm.com The quality level of our instruments is the result of the constant development of the product. This may produce some differences between the information written in this manual and the instrument you have purchased.
- Page 26 GHM GROUP – Delta OHM | Delta Ohm S.r.l. a socio unico Via Marconi 5 | 35030 Caselle di Selvazzano | Padova | ITALY Phone +39 049 8977150 | Fax +39 049 635596 www.deltaohm.com | info@deltaohm.com V1.0 09/11/2020...
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