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Summary of Contents for Air Monitor VELTRON III
- Page 1 VELTRON III VELTRON III Pressure & Flow Transmitter Pressure & Flow Transmitter Installation and Operation Manual Installation and Operation Manual DOC-0005742 Rev.C...
- Page 2 • Air Monitor assumes no responsibilities for this product except as stated in the warranty. • If the customer or any third party is harmed by the use of this product, Air Monitor assumes no responsibility for any such harm owing to any defects in the product which were not predictable, or for any indirect damages.
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Page 3: Table Of Contents
VELTRON III TABLE OF CONTENTS SECTION 1.0 GENERAL INFORMATION ......................... 5 1.1 PURPOSE OF THIS MANUAL ..............................5 1.2 TYPICAL AIRFLOW MEASUREMENT SYSTEM INSTALLATIONS .................5 1.3 STANDARD FEATURES AND SPECIFICATIONS ........................7 1.4 MODEL NUMBERING CODIFICATION ...........................8 1.5 CHECKING THAT YOU RECEIVED EVERYTHING........................9 1.6 WORKING ENVIRONMENT .................................9... - Page 4 VELTRON III SECTION 6.0 COMMUNICATIONS......................... 33 6.1 BACNET MS/TP ....................................33 6.1.1 BACnet Object Types .................................33 6.1.2 Protocol Implementation Statement ..........................33 6.1.3 Standard BACnet Objects Supported .........................34 6.1.4 Analog Input Object ................................35 6.1.5 BACnet Analog Inputs ..............................35 6.2 MODBUS RTU ....................................36 6.2.1 MODBUS Registers ................................37...
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Page 5: Section 1.0 General Information
This manual provides information regarding the installation, operation and maintenance of your differential pressure and flow transmitter. This is not an electrical or HVAC trade manual. This manual is the basic reference tool for the VELTRON III transmitter, including its main power connection and associated signal inputs and outputs. The complete system consists of the transmitter and associated airflow and temperature sensors. - Page 6 The single channel configuration is used for one installation location in a variety of duct configurations, primarily used for supply or return airflow. Differential pressure measurement probes are paired with the VELTRON III transmitter to provide DUCTED a complete airflow measurement system for each application SUPPLY AIR installation.
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Page 7: Standard Features And Specifications
PRESSURE ACCURACY ± 0.4% of reading from 0.10 to 5.0 In W.C. ± 0.75% of reading from 5.0 to 10.0 In W.C. SYSTEM ACCURACY ± 3% of reading when combined with Air Monitor Probes. TEMPERATURE ± 0.1°F at 32°F ACCURACY THERMAL OFFSET ±... -
Page 8: Model Numbering Codification
VELTRON III 1.4 MODEL NUMBERING CODIFICATION VELTRON III-ABCD-EFGH A = Model Configurations 2 = Single Channel, Single System 6 = Dual Channel, Split System 8 = Dual Channel, Dual (Separate) Systems B = Enclosure 1 = NEMA 1 Aluminum Enclosure... -
Page 9: Checking That You Received Everything
1.7 SERIAL NUMBER The serial number of your VELTRON III transmitter is located outside of the enclosure. The serial number is a unique identifier for your product. Please have it available when contacting Air Monitor for assistance regarding your product. -
Page 10: Section 2.0 Installation
Configuration and programming parameters are recorded on the factory set-up information sheet provided with the unit. Review this information and verify that the VELTRON III set-up is correct for your application. If any problems or discrepancies are detected, contact Air Monitor’s Customer Service Department at 727-447-6140 prior to proceeding. -
Page 11: Transmitter Dimensions
VELTRON III 2.1.2 Transmitter Dimensions NEMA 4X ENCLOSURE NEMA 1 ENCLOSURE 6.6" 7.0" VELTRON III Pressure and Flow Transmitter VELTRON III Pressure and Flow Transmitter 9.1" 10.3" 11.4" 11.2" Air Monitor Precision Airflow Measurement An ONICON Brand ON/OFF 8.3" 9.3"... -
Page 12: Transmitter Wiring Connections
VELTRON III 2.1.4 Transmitter Wiring Connections RESET TERM BIAS TERM BIAS RTD 1 RTD 2 AO1 / AO2 AO3 / AO4 BACnet 24 V INPUT PWR Rb2 Rb1 Ra Rb2 Rb1 Ra + com / + com + com / + com... - Page 13 VELTRON III 2.1.4 Transmitter Wiring Connections (Continued) A. Power/Signal Connections Input Power Requirements: • 24 VAC, 15VA @ 24 VAC, 40 VA with heater • 24 VDC, 10W @ 24 VDC, 35W with heater INPUT POWER TERM BIAS RTD 1...
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Page 14: Airflow Sensor
2.2.1 Airflow Sensor Process Connections Air Monitor recommends that signal tubing between the transmitter enclosure and all sensors be stainless steel or copper of the appropriate size. Use tees or manifolds to combine multiple sensors into single high and low pressure lines running to the transmitter’s channel fittings for each channel. -
Page 15: Temperature Sensors
2.3 TEMPERATURE SENSORS Temperature sensors RTD(s) provide ambient air temperature for density correction calculations. When the VELTRON III is provided with a NEMA 1 enclosure, the sensor may be installed in the airflow stream or outside the inlet in a shaded area. -
Page 16: Temperature Sensor (Rtd) Input Connections
VELTRON III 2.3.2 Temperature Sensor (RTD) Input Connections TERM BIAS RTD 1 RTD 2 AO1 / AO2 AO3 / AO4 BACnet 24 V INPUT PWR Rb2 Rb1 Ra Rb2 Rb1 Ra + com / + com + com / + com... -
Page 17: Section 3.0 Operation
Flow data will be displayed after a brief pause. Information shown on this screen (flow, temperature, velocity, etc.) will vary based on the VELTRON III operating configuration. In addition, system status data is provided at the top of the display window and the user defined locations tag is displayed at the bottom. -
Page 18: Configuration
The user interface consists of 4 push-buttons used for programming the transmitter. The displayed information is dependent on the factory configuration of the VELTRON III. The transmitter configurations are: Single Channel, Single System – Two transducers in series (stacked) to extend the range Dual Channel, Split System - Two pairs of transducers in parallel to allow the addition or subtraction of flow rates from two branches of same airstream and output the net result. -
Page 19: Entering The Programming Menus
VELTRON III 3.4 ENTERING THE PROGRAMMING MENUS Press ENT at any time to access the programming menus. If the password has been Password set previously, the following screens will be displayed. Password Menu Enter the password and you will be brought to the menus selection Enter screen. -
Page 20: Section 4.0 Main Menu
VELTRON III SECTION 4.0 MAIN MENU Single Main menu functions are used to configure transmitter settings common to Single Channel, Single System Configuration. Main Menu Flow Settings Display Settings Network Configuration Set Password Restore Factory Settings Product Information Sensor Status... -
Page 21: Flow Settings
VELTRON III 4.1 FLOW SETTINGS Flow settings will set the engineering units for the whole system. You cannot individually change units on other menu pages; for example, if you set the Flow Settings units to be in US and the velocity to be in FPM, the lockdown (low flow cut-off) Units System settings will be in FPM. -
Page 22: Network Configuration
VELTRON III 4.3 NETWORK CONFIGURATION This menu allows the user to set up the serial communications network. It can be Network Configuration used to configure the device for BACnet MS/TP or MODBUS RTU networks. When the network is enabled, the user will see the following icon next to the “System... -
Page 23: Sensor Status
VELTRON III 4.7 SENSOR STATUS This screen provides real-time operating status for the pressure transducers. Sensor Status Range Press Sensor (inH2O) (inH2O) 0.00003 24-18-132 -0.00044 23-18-178 0.00002 24-18-133 -0.00031 23-18-215 Present Missing ESC - Leave 4.8 BOARD DATA This screen provides real-time operating information for the Board Data transmitter electronics. -
Page 24: Humidity Correction
VELTRON III 4.11 HUMIDITY CORRECTION This function allows the user to set the air to be adjusted for Supply Air, Return Humidity Correction Air or Custom. For Supply air if Temp is >85F, it uses RH Low correction. For Custom Air if Temp is >65F, it uses RH Low for RH correction. -
Page 25: Section 5.0 System Set - Up Menu
VELTRON III SECTION 5.0 SYSTEM SET - UP MENU Single This screen provides the system set up menu for Single Channel, Single System Configuration. System Setup Menu Flow Configuration Display Configuration Analog Output Configuration Filters and Lockdown Field Characterization Custom ID Configuration... -
Page 26: Flow Configuration
VELTRON III 5.1 FLOW CONFIGURATION Single This menu is used to select the flow inlet type and adjust the flow settings. Flow Configuration Probe Type Probe Type VOLU-p/FI The probe type is selected by the user based on the sensor used. The options are:... -
Page 27: Display Configuration
VELTRON III 5.2 DISPLAY CONFIGURATION Single Channel, Single System: Display Configuration Line 1 is Flow Line 1 Flow Line 2 can display Velocity/Temperature/DP/Atm Pressure/Velocity Std./None Line 2 Temperature Line 3 can display Velocity/Temperature/DP/Atm Pressure/Velocity Std./None Line 4 can display Velocity/Temperature/DP/Atm Pressure/Velocity Std/None... -
Page 28: Analog Output Configuration
VELTRON III 5.3 ANALOG OUTPUT CONFIGURATION Single This menu is used to configure the analog outputs. In split and dual modes the outputs are assigned to the specific channels. Analog Output Configuration Output Type Type 4-20 mA Use this to configure the output type. The options are 4-20mA, 0-10VDC,... -
Page 29: Filters And Lockdown
2. To adjust the transmitter’s output to bring it into close correlation with field measured flow data. The K-Factor gain and bias values can be entered directly or the VELTRON III can calculate these values based on measured and reference values from a 1, 2 or 3 point airflow traverse. - Page 30 The number of data points (1-3) to be used for field characterization. Data Points There are two columns shown on the menu; one for Reference (the test and balancer results) and one for VELTRON III Points. Data is stored in the system’s non-volatile memory. The following are general guidelines characterizing flow based on the number of data points.
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Page 31: Custom Id Configuration
VELTRON III 5.5 FIELD CHARACTERIZATION (CONTINUED) 1 Point - Enter a flow rate or velocity that is at or near the top of the operating range. Characterization Calculator Number of Points Flow Data Points Reference Vel III Points Point 1... -
Page 32: Humidity Correction Option
VELTRON III 5.7 HUMIDITY CORRECTION OPTION Once selected the instrument will present the RH Correction screen. Where Humidity Correction Application can be one of four: Application Supply Air • Return Air Zone • Supply Air • Custom RH Low •... -
Page 33: Section 6.0 Communications
VELTRON III SECTION 6.0 COMMUNICATIONS The VELTRON III is provided with BACnet MS/TP and MODBUS RTU as serial communications protocol options. BACnet is the default setting. The field configurable serial communications interface is described on the following pages. Refer to section 2.1.4 Transmitter Wiring Connections for detailed information on wiring connections. -
Page 34: Standard Bacnet Objects Supported
VELTRON III 6.1.3 Standard BACnet Objects Supported Object Identifier Writeable 0 – 4,194,303 Object Name VELTRON III Writeable Alpha-numeric; 20 character limits. See “Custom ID” setting in the Service Menu. Object Type Device Read-only System Status Operational Read-only Vendor Name... -
Page 35: Analog Input Object
VELTRON III 6.1.4 Analog Input Object Object Identifier Analog Input-0 to Analog Input-X1 Read-only Object Name Various Read-only Object Type Analog-Input Read-only Present Value REAL Read-only Status Flags F, F, F, F Read-only Event State Normal Read-only Out of Service... -
Page 36: Modbus Rtu
VELTRON III 6.1.5 BACnet (cont.) Dual Channel, Dual System Object Name Description Units Analog Input 1 Total Flow Sys1 Cubic feet per minute Analog Input 2 Flow Total Plus Cubic feet per minute Analog Input 3 D.P. Sys 1 Inches of Water... -
Page 37: Modbus Registers
VELTRON III 6.2.1 MODBUS Registers Operating Mode Register Description Register Type Address Data Type Single Total Flow Input register 30000 Floating point Single Differential Pressure Input register 30002 Floating point Single Temperature Input register 30004 Floating point Single Velocity Input register... - Page 38 1 = ON, 0 = OFF System Reset Write Multiple Coil 150000 boolean 1 = RESET Read Slave ID 17000 ASCII Returns string "VELTRON III" K-factor Read Coil 10000 Returns the state of the K-factor 727-447-6140 Page 38 airmonitor.com/hvac/...
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Page 39: Section 7.0 Maintenance
• Air Monitor does not recommend a specific time interval between re-calibrations. Calibrations should be scheduled to meet the needs of the facility where the VELTRON III is installed. For example, critical care facilities may wish to schedule annual re-calibrations while commercial/retail buildings may only schedule re-calibrations at 3-5 year intervals. - Page 40 11451 Belcher Road South • Largo, FL 33773 • USA • Tel +1 (727) 447-6140 www.airmonitor.com/hvac/ • hvacsales@airmonitor.com...
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