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NEVADANANO MOLECULAR PROPERTY SPECTROMETER A2L Series User Manual

Refrigerant gas sensor
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TM
TM
MOLECULAR PROPERTY SPECTROMETER
(MPS
)
A2L REFRIGERANT GAS SENSOR
USER MANUAL
Industrial form factor
Residential form factor
(Available now)
(Available 2020)
NNTS Proprietary Information
SM-UM-0004-01

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Summary of Contents for NEVADANANO MOLECULAR PROPERTY SPECTROMETER A2L Series

  • Page 1 MOLECULAR PROPERTY SPECTROMETER (MPS A2L REFRIGERANT GAS SENSOR USER MANUAL Industrial form factor Residential form factor (Available now) (Available 2020) NNTS Proprietary Information SM-UM-0004-01...
  • Page 2 Due to continuing system improvements, NevadaNano is not responsible for inaccurate information which may appear in this manual. For the latest product updates, consult the NevadaNano web site at www.nevadanano.com. In no event will NevadaNano be liable for direct, indirect, special exemplary, incidental, or consequential damages resulting from any defect or omission in this document, even if advised of the possibility of such damages.

  • Page 3: Table Of Contents

    Contents How the MPS A2L Refrigerant Gas Sensor Works .............. 4 Communicating with the MPS A2L Refrigerant Gas Sensor ..........4 2.1. Serial (UART) Communication ................4 2.1.1. Data Representation ................4 2.1.2. Protocol Specification ................5 2.1.3. Checksum Calculation ................7 2.1.4.

  • Page 4: How The Mps A2L Refrigerant Gas Sensor Works

    1. How the MPS A2L Refrigerant Gas Sensor Works The MPS A2L Refrigerant Gas Sensor is a smart sensor with built-in environmental compensation that detects and accurately quantifies low-global-warming, mildly flammable (A2L) refrigerants used in HVAC applications. It is robust, extremely poison-resistant, and comes factory-calibrated. Sensor readings are output on a standard digital bus or industry-standard analog output.

  • Page 5: Protocol Specification

    2.1.2. Protocol Specification Communication to and from the MPS A2L Refrigerant Gas Sensor is made up of “packets.” The communication paradigm is that of “request” and “reply.” An external host sends a “request” packet to the sensor. The sensor returns a “reply” packet to the external host. A packet consists of a fixed size “header”...
  • Page 6 The Reply Packet (Figure 2) consists of the following fields: Field Size Description CmdID 1 Byte Command ID (should match the original request) Status 1 Byte Return status of the request Length 2 Bytes Length of the Payload (0 if no payload) Checksum 2 Bytes Checksum of the entire packet...

  • Page 7: Checksum Calculation

    2.1.3. Checksum Calculation The algorithm for checksum calculation is that of 16-bit CRC CCITT with start byte 0xFFFF. Checksum is computed over the entire packet (header and payload). The checksum field in the header is initialized with zeros before computing checksum. If there is no payload, checksum is computed against the header only.

  • Page 8: Startup And Measurement Sequence

    For more information on how to use the above function, please look at the sample test program “Sample Code” located here: https://nevadanano.com/downloads 2.1.4. Startup and Measurement Sequence Figure 3 describes the recommended steps after powering on the sensor plus the measurement sequence for getting answer data.
  • Page 9 Power on Sensor Wait 3 seconds for sensor to boot Read Register: 0x41 Read MPS Status Error Condition: Status OK? POST failure? Use Version Info to Read Register: 0x42 determine FW upgrade, Read MPS Version Info answer type, feature set, etc. Write Register: 0x61 Start Continuous Value: 0x2...
  • Page 10 Figure 4 describes sample Request and Response packets for the Perform Measurement and Get- Answer Vector sequences. Perform Measurement Length Checksum Payload CmdID Reserved Request 0x0061 0x0001 0x0000 Checksum 0x02 Measurement Start CmdID Status Checksum Length Measurement Response 0x0000 0x61 0x00 Checksum Success...

  • Page 11: Command Table

    2.1.5. Command Table Hex Code Command ID Payload Length [bytes] Hex Code Command ID Request Response 0x01 ANSWER 0x03 CONC 0x04 0x09 ENG_DATA 84-128 0x21 TEMP 0x22 PRES 0x23 REL_HUM 0x24 ABS_HUM 0x41 STATUS 0x42 VERSION 0x43 SENSOR_INFO 0x61 MEAS 0x62 SHUT_DOWN 2.1.6.
  • Page 12 3. Command 0x04 – ID – Read Flammable Gas ID Description: Returns flammable gas ID as determined by the MPS. Parameters: N/A Response: ID 32-bit unsigned value. Flammable gas ID. Description No Gas Refrigerant Unknown Gas Under Range – Concentration less than 0 %LEL Over Range –...
  • Page 13 �� �� Response: ABS_HUM 32-bit floating point value. Ambient absolute humidity ( 9. Command 0x41 – STATUS – Read MPS Status Description: Returns the status of the MPS; refer to Sec. 2.1.2 for status descriptions. Parameters: N/A Response: STATUS 8-bit unsigned value. Status of MPS 10.

  • Page 14: Sensor Analog Output Mode

    Measurement Value (Byte) Conc. Unit [7:4] Mode [3:0] The “concentration unit” (bits 7:4 of the measurement byte) is %LEL; this is the unit that will be reported for for commands 0x01 and 0x03. Unit Name Description PERCENT_LEL Concentration reported as %LEL. The measurement mode (bits 3:0 of the measurement byte) consists of the following possible values: MODE...

  • Page 15: Testing The Mps A2L Refrigerant Gas Sensor

    Figure 5: MPS A2L Refrigerant Gas Sensor output when configured in analog mode When there is an error condition or special status, as reported by the sensor status field (outlined in Section 2.1.2.), the voltage level does not indicate gas concentration. Instead, the voltage is set to report an error or special status (see table below).

  • Page 16: Setup #2: Testing In Various Environmental Conditions

    Nafion™ TT-110 controller) for modulating flow rate. Humidity-permeable tubing (e.g. ) can be used in-line to humidify the gas stream to the ambient humidity level. The gas is then plumbed into an enclosed volume such as a glass or plastic tank (or the plenum of an HVAC system) containing the sensors.
  • Page 17 Important note: Do not use so-called “zero-air,” which is a mix of only two gases—20.9% oxygen, with balance nitrogen—and therefore does not represent the air in which the sensor actually operates (inside an air conditioner, e.g.). Compressed real air contains not only oxygen and nitrogen, but argon, carbon dioxide and other gases.

  • Page 18: Operating Conditions For The Mps A2L Refrigerant Gas Sensor

    Up to 4kV on ground plane; up to 8kV corona discharge 4.1. Hazardous Locations and System Integration Integrating the MPS into intrinsically safe systems requires additional design consideration. Refer to the MPS Hazardous Locations User Guide (https://nevadanano.com/downloads) for information regarding certifications, protection concepts, entity parameters, etc. SM-UM-0004-01...

  • Page 19: Certificates Of Compliance

    5. Certificates of Compliance The following certificates of compliance are available here: https://nevadanano.com/downloads Certificates of Certification Body Certificate Number MPS Form Factor Compliance Certified “IS” Industrial Only Certificate of Conformity FM Approvals LLC FM19US0145U (USA) “IS” Industrial Only Certificate of Conformity...
  • Page 20 Nevada Nanotech Systems Inc. 1395 Greg Street, Suite 102 Sparks, Nevada 89431 United States Tel: 1-775-972-8943 Fax: 1-775-972-8078 info@nevadanano.com www.nevadanano.com SM-UM-0004-01...

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