Dwyer Instruments AVPT Series Installation and operating instructions

Series AVPT Pencil Style Air Velocity Transmitter
Specications - Installation and Operating Instructions
Bulletin AQ-AVPT-C
The Series AVPT Pencil Style Air Velocity Transmitter uses thermal anemometer
technology to provide high accuracy and stable air velocity measurements in imperial
and metric units. The Series AVPT can be congured with either a voltage output or
BACnet MS/TP communication to provide universal inputs to a variety of monitoring
equipment. Models are available with xed cable lengths of 20 or 78 inches with ying
leads or a 5-pin M12 connector on a 24 inch cable. Probes are available in lengths
of 6 or 12 inches. A mounting ange included with the product provides the ability to
vary insertion depth.
Models are available in 3% or 5% accuracy to suit a variety of applications, while the
optional BACnet MS/TP communication protocol allows units to be daisy-chained to
provide access to all of the velocity and temperature measurements.
INSTALLATION
Included Duct Mount Flange:
The transmitter should be mounted away from fans, corners, heating and cooling
coils, and other equipment that will affect the measurement of the air velocity. It is
recommended that the AVPT is mounted at least 10 duct diameters downstream of any
disturbances and 5 duct diameters upstream of any disturbances, if possible.
1. Mark and drill a 0.750-0.938˝ (20-24 mm) diameter hole into the duct.
2. Insert and center the duct mount ange in the previously drilled hole and mark
location of the three mounting screw holes.
3. Remove the mounting ange and drill or punch the mounting holes in the marked
locations.
4. Fasten the ange to the duct using three #8 x 1/2˝ pan head sheet metal screws.
Do not over tighten screws.
5. Insert the AVPT probe into the duct mount ange and set the desired insertion
depth.
6. Note the ow direction and unit alignment as shown on sensor tip and product
label, tighten probe retention set screw on the duct mount ange to afx the probe
in place.
Electrical Connection:
The cable supplied with the BACnet version of the Series AVPT allows access to the
device power and the BACnet MS/TP communication signals. An additional signal is
also provided to recover the default BACnet communication settings based on the
ordered conguration.
SPECIFICATIONS
Service: Clean air.
Ranges: 1000, 2000, 3000, or 4000 FPM (5, 10, 15, or 20 m/s); Model specic.
Accuracy: Standard: ±(5% reading +40 FPM); High accuracy: ±(3% reading +40
FPM); Model specic.
Power Requirements: 24 VAC/VDC ±20%.
Current Consumption: < 50 mA.
Outputs: Analog: 0-10 V (0-5 V congurable).
BACnet MS/TP: Selectable at time of order.
Supported Baud Rate: 9600, 19200, 38400, 57600, 76800, and 115200.
Voltage Output Load Resistance: 10k Ω minimum (10 V output with AC supply);
1k Ω minimum all other conditions.
Electrical Connection: Cable: Plenum rated cable with 22 AWG conductors.
5-Conductor Cable whip: 20˝ (0.5 m) or 78˝ (2 m).
5-pin M-12: 24˝ (0.6 m); model specic.
Response Time (90%): 4 s, typical.
Operational Temperature Limits: -4 to 140 °F (-20 to 60 °C).
Storage Temperature Limits: -40 to 140°F (-40 to 60°C).
Probe Length: 6˝ or 12˝; model specic.
Enclosure Rating: NEMA 3.
Mounting Orientation: Flow direction must be parallel to the sensor tip; See Instal-
lation section for details.
Weight: 1.4 oz (40 g); based on M12 connection with 12˝ probe length.
Agency Approvals: CE, RCM, BTL, UL plenum rated (UL tested).
MODEL CHART
Example AVPT -S 03 C1 A 06 127 -FC AVPT-S03C1A06127-FC
Series AVPT Pencil style air velocity
transmitter
Accuracy S
H
Standard ±5% of reading
+40 FPM
High accuracy ±3% of
reading +40 FPM
Velocity
Range
01
02
03
04
05
10
15
20
1000 FPM
2000 FPM
3000 FPM
4000 FPM
5 m/s
10 m/s
15 m/s
20 m/s
Electrical
Connection
C1
C2
M1
Cable whip 20˝ (0.5 m)
Cable whip 78˝ (2 m)
M12 24˝ (0.6 m)
Output Type A
B
Analog 0-5 V and 0-10 V
BACnet MS/TP
Probe Length 06
12
6˝
12˝
BACnet
Address
127 000-127 whole integer
with BACnet output
Options FC
NIST
Factory calibration
certicate
NIST traceable certicate
10 [254]
10 [254]
16 [406]
16 [406]
6˝ probe length 12˝ probe length
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: [phone]
Fax: [phone]
www.dwyer-inst.com
e-mail: [email protected]

BACnet MS/TP Individual Power Supply:
To connect the AVPT in a network containing individual local supplies, follow the
wiring diagram provided in Figure 3. Use a cable containing a twisted pair and a single
conductor. The pair is to be used for D1(+) and D0(-). The single conductor is to be
used for common. Both AC and DC supplies are suitable for this conguration.
In either conguration you must use shielded cable. Connect the shield to earth ground
at one location only to prevent ground loops.
All devices in the network should be daisy chained. Star connections and T connections
are not permitted.
The D1(+) and D0(-) lines must be terminated at both ends with a 120 ohm resistor
The network must be biased properly. No more than two sets of bias resistors should
be enabled in the network.
For models ordered with optional M-12 electrical connections. Reference Table 1 for
wiring color and pinout designation.
BACnet MS/TP Settings
Valid addresses range from 000 to 127. By default, the device is shipped with the
address 127. A valid and unused address should be set before connecting to an
existing network. The device address is set by writing to the “Device Address” (PIV1)
object. A power cycle or reset of the device is required for the new address to take
affect.
Auto Baud Serial Conguration
Auto Baud serial conguration enables the device to determine the Baud rate directly
from the serial trafc. This allows a device to be quickly and easily deployed on a
BACnet MS/TP network.
Auto Baud serial conguration is enabled by default, and will begin examining the
serial bus for communication at power up. Supported Baud Rates can be found in
Table 1.
Power Supply:
Choose a power supply with a voltage and current rating sufcient to meet the power
specications under all operating conditions. If the power supply is unregulated, make
sure the output voltage remains within the required voltage range under all power line
conditions. Ripple on the supply should not exceed 100 mV.
BACnet MS/TP Operation:
BACnet MS/TP Setup:
BACnet MS/TP Common Power Supply:
To connect the AVPT in a network containing a common power supply, follow wiring
diagram provided in Figure 2. Use a cable containing two twisted pairs. One pair is to
be used for D1(+) and D0(-). The other pair is to be used for power and common. This
conguration is not suitable for AC supplies. Use a DC supply only. Care should be
taken that there are not too many devices powered from the same supply as voltage
drops will occur in the wiring. If you have many devices, or have long cable runs, the
local supply conguration may be a better choice.
DO NOT EXCEED SPECIFIED SUPPLY VOLTAGE RATINGS.
PERMANENT DAMAGE NOT COVERED BY WARRANTY WILL
RESULT.
CAUTION
POWER
PWR (RED
)
GND (BK)
+
-
Figure 1: Power supply wiring
Figure 2: BACnet common power supply wiring
Table 1: M-12 wiring pinout
Figure 3: BACnet individual power supply wiring
Wire Color M-12 Pin
White
Black
Green
Brown
Red
1
2
3
4
5
Sensor is sensitive to Electro-Static Discharge (ESD). Follow
industry standard practice for control and protection against ESD.
Failure to exercise good ESD practices may cause damage to the sensor.
Wiring should comply with ANSI/ASHRAE Standard 135-2010
BACnet A Data Communication Protocol for Building Automation
and Control Networks, American Society of Heating, Refrigerating and Air-Conditioning
Engineers, Inc., 2010.
Communications wiring should be in a daisy-chain whenever
possible. Star connections are not recommended.
Cable shield must be connected to earth ground at one location
only.
NOTICE
NOTICE
NOTICE
NOTICE
PWR
(RED)
D1 (+)
(BRN)
DO (-)
(GRN)
CFG
(WH)
GND
(BK)
TO
PREVIOUS
DEVICE
D1 (+)
D0 (-)
PWR
COM
D1 (+)
D0 (-)
PWR
COM
TO
NEXT
DEVICE
TO PREVIOUS
DEVICE
PWR
(RED)
D1 (+)
(BRN)
DO (-)
(GRN)
CFG
(WH)
POWER
SUPPLY
D1 (+)
D0 (-)
COM
D1 (+)
D0 (-)
TO NEXT
DEVICE
COM
+ -
GND
(BK)
Table 2: Supported baud rates
Supported Baud Rates Data Size Parity Stop Bits
9600
19200
38400
57600
76800
115200
8None 1

Note that while serial conguration is in progress, the device may not respond to
requests.
The Auto Baud serial conguration process will complete once a WhoIs or
ReadProperty command is successfully received and processed.
The Auto Baud serial conguration procedure is started after a power-cycle (if enabled).
Device Information
The default device object identier is 607xxx, where xxx is replaced by the MS/
TP device address set by the “Device Address” object’s present value. The object
identier value will change as the device address changes. However, if a specic
object identier is written via BACnet MS/TP Communication Protocol, then that value
is stored and changes to the device address address will no longer affect the object
identier. See Appendix VI for the device object property tables.
Accessing the Measurements
The analog input object AI1 through AI4 are for viewing Air Velocity or Temperature in
the desired engineering units. The object property tables for these analog input objects
can be found in Appendix VI.
Device Address
This object provides the means to congure the BACnet MS/TP device address. The
valid range of the present value property is 000 – 127. A device reset is required for a
new value to take affect. Default value: 127
Serial Baud Rate
This object allows the serial communication speed to be congured from the set of
supported rates. If “Auto Baud” (7) is set (default), then the auto serial conguration is
performed each time the device resets/powers on. If any other value is set, auto serial
conguration is disabled and only that Serial Baud Rate is used.
Reset Factory Defaults
Resets all settings to factory default values. Writing the present value to ACTIVE(1)
will reset the device address, device instance, device name, max master, etc. A device
reset is required to complete the factory reset procedure.
Reset Factory Defaults - Via Wiring Method
A physical reset of factory defaults can also be performed using the following sequence:
1. Connect and power the unit.
2. Disconnect Cong.(WH) wire from power supply GND(BK) for 2 seconds.
3. Reonnect Cong.(WH) wire to power supply GND(BK) for 10 seconds.
4. Cycle power to the unit, waiting at least 5 seconds to reapply power to the unit. The
device communication settings should now be reset to factory default values.
BACnet MS/TP Communication Protocol Services
Device Communication Control Service (DM-DCC-B)
This device supports the Device Communication Control Service BIBB. The optional
time duration in minutes is also supported. This device is congured with a password
that must be provided to successfully execute this command. The password is “Dwyer”.
Reinitialize Device Service (DM-RD-B)
This device supports the Reinitialize Device Service BIBB. The supported device
states are COLDSTART and WARMSTART. All other states return error. This device
is congured with a password that must be provided to successfully execute this
command. The password is “Dwyer”.
MAINTENANCE/REPAIR
Upon nal installation of the Series AVPT, no routine maintenance is required; though
sensor should be kept clean and free of dirt or debris.
WARRANTY/RETURN
Refer to “Terms and Conditions of Sale” in our catalog and on our website. Contact
customer service to receive a Return Goods Authorization number before shipping the
product back for repair. Be sure to include a brief description of the problem plus any
additional application notes.
Table 3 : BACnet MS/TP communication protocol object overview
Table 4: Serial Baud Rate
Value Serial Baud Rate
1
2
3
4
5
6
7
9600
19200
38400
57600
76800
115200
Auto Baud
Object Type
Dynamically
Creatable
Dynamically
Deletable
Object
Identier Object Name
Device No No 607xxx AVPT Velocity
Analog Input No No AI1
AI2
AI3
AI4
Velocity FPM
Velocity MPS
Temperature F
Temperature C
Positive
Integer Value
No No PIV1 Device Address
Multi-State
Value
No No MSV1 Serial Baud Rate
Binary Value No No BV1 Restore Factory
Defauls
Changes to Max Master require a power cycle/reset to take effect.
NOTICE
This symbol indicates waste electrical products should not be disposed
of with household waste. Please recycle where facilities exist. Check with
your Local Authority or retailer for recycling advice.
Property Default Value Property Data Type Access
Object Identier 607xxx BACnetObjectOdentier Read/Write
Object Name “AVPT Velocity” CharacterString(32) Read/Write
Object Type DEVICE(8) BACnetObjectType Read
System Status Operational(0) BACnetDeviceStatus Read
Vendor Name “Dwyer Instruments,
Inc.”
CharacterString Read
Vendor Identier 607 Unsigned Read
Model Name “AVPT” CharacterString Read
Firmware Revision “x.x” CharacterString Read
Application
Software Version
“x.x.x” CharacterString Read
Location CharacterString(32) Read/Write
Description “Thermal
Anemometer”
CharacterString(32) Read/Write
Protocol Version 1 Unsigned Read
Protocol Revision 14 Unsigned Read
Protocol Services
Supported
See PICS BACnetServices
Supported
Read
Protocol Object
Types Supported
See Table 3 BACnetObject
TypesSupported
Read
Object List See Table 3 BACnetArray Read
Maximum APDU
Length Accepted
480 Unsigned Read
Segmentation
Supported
NO_
SEGMENTATION(3)
BACnetSegmentation Read
APDU Timeout 0Unsigned Read
Number of ADPU
Retries
0Unsigned Read
Max Master 127 Unsigned Read/Write
Max Info Frames 1 Unsigned Read
Device Address
Binding
Empty BACnetAddressBinding Read
Database Revision 0Unsigned Read
Property List BACnetARRAY[n] of
BACnetPropertyIdentier
Read
Serial Number “xxxxxxxx” CharacterString Read
Sensor Firmware
Version (1002)
“x.x.x” CharacterString Read
Sensor Hardware
Version (1004)
“x.x” CharacterString Read
OBJECT TABLES
Table 5 : Device object

Printed in U.S.A. 11/19 FR# 444544-00©Copyright 2019 Dwyer Instruments, Inc.
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A.
Phone: [phone]
Fax: [phone]
www.dwyer-inst.com
e-mail: [email protected]
Property Default Value Property Data Type Access
Object Identier AI1 BACnetObjectOdentier Read
Object Name “Velocity FPM” CharacterString Read
Object Type ANALOG_INPUT (0) BACnetObjectType Read
Present Value Current reading Real Read
Status Flag 0 BACnetStatusFlags Read
Event State NORMAL (0) BACnetEventState Read
Reliability NO_FAULT_
DETECTED (0)
BACnetReliability Read
Out of Service FALSE (0) Boolean Read/Write
Units Feet-per-minute (77) BACnetEngineeringUnits Read
Property List BACnetARRAY[n] of
BACnetPropertyIdentier
Read
Property Default Value Property Data Type Access
Object Identier AI2 BACnetObjectOdentier Read
Object Name “Velocity MPS” CharacterString Read
Object Type ANALOG_INPUT (0) BACnetObjectType Read
Present Value Current reading Real Read
Status Flag 0 BACnetStatusFlags Read
Event State NORMAL (0) BACnetEventState Read
Reliability NO_FAULT_
DETECTED (0)
BACnetReliability Read
Out of Service FALSE (0) Boolean Read/Write
Units Meters-per-second
(74)
BACnetEngineeringUnits Read
Property List BACnetARRAY[n] of
BACnetPropertyIdentier
Read
Property Default Value Property Data Type Access
Object Identier AI3 BACnetObjectOdentier Read
Object Name “Temperature F” CharacterString Read
Object Type ANALOG_INPUT (0) BACnetObjectType Read
Present Value Current reading Real Read
Status Flag 0 BACnetStatusFlags Read
Event State NORMAL (0) BACnetEventState Read
Reliability NO_FAULT_
DETECTED(0)
BACnetReliability Read
Out of Service FALSE (0) Boolean Read/Write
Units Degrees-fahrenheit
(64)
BACnetEngineeringUnits Read
Property List BACnetARRAY[n] of
BACnetPropertyIdentier
Read
Property Default Value Property Data Type Access
Object Identier AI4 BACnetObjectOdentier Read
Object Name “Temperature C” CharacterString Read
Object Type ANALOG_INPUT (0) BACnetObjectType Read
Present Value Current reading Real Read
Status Flag 0 BACnetStatusFlags Read
Event State NORMAL (0) BACnetEventState Read
Reliability NO_FAULT_
DETECTED(0)
BACnetReliability Read
Out of Service FALSE (0) Boolean Read/Write
Units Degrees-celsius (206) BACnetEngineeringUnits Read
Property Li BACnetARRAY[n] of
BACnetPropertyIdentier
Read
Property Default Value Property Data Type Access
Object Identier PIV1 BACnetObjectOdentier Read
Object Name “Device Address” CharacterString Read
Object Type POSTIVE_INTEGER_
VALUE(48)
BACnetObjectType Read
Present Value 127 Unsigned Read/Write
Status Flag 0 BACnetStatusFlags Read
Event State NORMAL (0) BACnetEventState Read
Reliability NO_FAULT_
DETECTED(0)
BACnetReliability Read
Out of Service FALSE (0) Boolean Read/Write
Units No-units (95) BACnetEngineeringUnits Read
Property List BACnetARRAY[n] of
BACnetPropertyIdentier
Read
Property Default Value Property Data Type Access
Object Identier MSV1 BACnetObjectOdentier Read
Object Name “Serial Baud Rate” CharacterString Read
Object Type MULTI_STATE_
VALUE(19)
BACnetObjectType Read
Present Value 7Unsigned Read/Write
Status Flag 0 BACnetStatusFlags Read
Event State NORMAL (0) BACnetEventState Read
Reliability NO_FAULT_
DETECTED(0)
BACnetReliability Read
Out of Service FALSE (0) Boolean Read/Write
State Text {“9600”, “19200”,
“38400”, “57600”,
“76800”, “115200”,
“Auto Baud”}
BACnetARRAY[N] of
CharacterString
Read
Property List BACnetARRAY[n] of
BACnetPropertyIdentier
Read
Property Default Value Property Data Type Access
Object Identier BV1 BACnetObjectOdentier Read
Object Name “Restore Factory
Defaults”
CharacterString Read
Object Type BINARY_VALUE (5) BACnetObjectType Read
Present Value INACTIVE (0) BACnetBinaryPV Read/Write
Status Flag 0 BACnetStatusFlags Read
Event State NORMAL (0) BACnetEventState Read
Reliability NO_FAULT_
DETECTED(0)
BACnetReliability Read
Out of Service FALSE (0) Boolean Read/Write
Property List BACnetARRAY[n] of
BACnetPropertyIdentier
Read
Table 6 : Analog input - Velocity FPM
Table 7 : Analog input - Velocity MPS
Table 8: Analog input - Temperature F
Table 9: Analog input - Temperature C
Table 10: Positive integer value - Device address
Table 11: Multi-state value - Serial baud rate
Table 12: Binary value - Restore factory default values
OBJECT TABLES (CONTINUED)