Air Monitor ELECTRA-flo / SD User manual

ELECTRA-flo / SD
Thermal Airow & Temperature
With Dual Analog Output
Installation, Operation and Maintenance Manual
P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • Fax [phone]
www.airmonitor.com • [e-mail]
1035 06-16

P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 2
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P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 3
SAFETY INFORMATION
This meter was calibrated at the factory prior to shipment. To ensure correct use of the meter, please
read this manual thoroughly.
Regarding this Manual:
• This manual should be passed on to the end user.
• Before use, read this manual thoroughly to comprehend its contents.
• The contents of this manual may be changed without prior notice.
• All rights reserved. No part of this manual may be reproduced in any form without
Air Monitors’s written permission.
• Air Monitor makes no warranty of any kind with regard to this material, including, but not
limited to, implied warranties of merchantability and suitability for a particular purpose.
• All reasonable effort has been made to ensure the accuracy of the contents of this manual.
However, if any errors are found, please inform Air Monitor.
• 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.
Safety Precautions:
The following general safety precautions must be observed during all phases of installation,
operation, service, and repair of this product. Failure to comply with these precautions or with
specic WARNINGS given elsewhere in this manual violates safety standards of design,
manufacture, and intended use of the product. Air Monitor Corporation assumes no liability for
the customer’s failure to comply with these requirements. If this product is used in a manner not
specied in this manual, the protection provided by this product may be impaired.
The following symbols are used in this manual:
!
CAUTION
Messages identied as “Caution” contain information regarding potential damage to the product or
other ancillary products.
IMPORTANT NOTE
Messages identied as “Important Note” contain information critical to the proper operation of the
product.
i

P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 4
TABLE OF CONTENTS
1.0 GENERAL INFORMATION ....................................................................................... 5
1.1 PURPOSE OF THIS GUIDE ............................................................................ 5
1.2 TYPICAL METER INSTALLATION ............................................................... 5
2.0 SPECIFICATIONS...................................................................................................... 6
2.1 ACCURACY .................................................................................................... 6
2.2 RANGE ........................................................................................................... 6
2.3 PROBE ASSEMBLY ........................................................................................ 6
2.4 TRANSMITTER .............................................................................................. 6
2.5 POWER ........................................................................................................... 6
3.0 INSTALLATION......................................................................................................... 7
3.1 INSTALLATION ............................................................................................. 7
3.2 RECEIVING & INSPECTION........................................................................... 7
3.3 PLACEMENT GUIDELINES ........................................................................... 7
3.4 MOUNTING ................................................................................................... 8
3.5 POWER/SIGNAL CONNECTIONS................................................................. 9
3.6 CONFIGURATION ....................................................................................... 10
3.7 START-UP / OPERATION............................................................................. 11
3.8 LEDs ......................................................................................................... 11
3.9 ANALOG OUTPUT SIGNALS...................................................................... 11
4.0 MAINTENANCE / INSPECTIONS .......................................................................... 12
4.1 MAINTENANCE / INSPECTION.................................................................. 12
4.2 TROUBLESHOOTING .................................................................................. 12
5.0 WARRANTY ........................................................................................................ 13
5.1 WARRANTY INFORMATION ...................................................................... 13

P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 5
SECTION 1.0: GENERAL INFORMATION
We, at Air Monitor, would like to thank you for purchasing our quality, U.S. made, Thermal Airow &
Temperature Measurement System. As our valued customer, our commitment to you is to provide fast reliable
service and assistance, while continuing to offer you new products to meet your growing ow measurement
needs.
1.1 PURPOSE OF THIS GUIDE
We have written this guide to provide the persons responsible for the installation, operation and maintenance
of your thermal airow measurement system with the most specic equipment information they will need.
This is NOT an electrical or HVAC trade manual.
This guide is the basic reference tool for the ELECTRA-o/SD with analog outputs only.
1.2 TYPICAL METER INSTALLATION
Air Monitor’s ELECTRA-o/SD accurately measures the average velocity of owing air by means of thermal
dispersion at the surface-mount thermistor sensor locations in the duct. Temperature is also measured via
these thermistors. Microprocessor based circuitry within the enclosure then converts the rate of thermal
dispersion into average airow velocity and temperature analog signals which are transmitted via a customer-
installed cable to a local controller or BMS.
TYPICAL ELECTRA-o/SD Installation
VAV Installations Option 1: Locate ELECTRA-flo/SD a
minimum of 3" upstream of the VAV box, or 3" upstream
of the pneumatic flow ring (remove the ring).
3" Upstream
Minimum
1 Duct Diameter
Minimum
VAV Box
Flow Direction
½" Conduit Outlet
Square Duct Round Duct
VAV Installations Option 2: When mounted downstream
of the VAV box, position the ELECTRA-flo/SD a minimum
or one duct diameter downstream of the VAV box.
Equivalent Duct Diameter X
Rectangular Duct: X = 2 (HxW) Circular Duct: X = Duct Diameter
H+W

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ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 6
SECTION 2.0: SPECIFICATIONS
2.4 TRANSMITTER
Enclosure:
NEMA 4 rated. Injection molded
polycarbonate, UL94 V-0 rated
Electrical Connections:
Separate power and signal terminal strips
with plug-in connectors
Outputs:
Dual analog for airow and temperature.
User selectable via DIP switches – 0-5 VDC,
0-10 VDC, 4-20 mA. Analog outputs are
isolated from input power.
Conguration:
Via eight DIP switches.
Filter:
User selectable via DIP switch – none, light,
medium, and heavy.
Temperature Limits:
–20º F to 120º F Transmitter
–20º F to 120º F Airow
Humidity Limits:
0 to 99% RH, non-condensing
2.5 POWER
Power Supply:
24 VAC (20-28 VAC) or 24 VDC (20-40 VDC),
automatically selected.
Power Consumption:
5 VA or 5 W
Circuit Protection:
Power input is isolated, fused, and reverse
polarity protected.
2.1 ACCURACY
Sensor Accuracy:
Velocity: ±2% of Reading
Temperature: ±0.15º F
Overall System Accuracy:
Flow: ±3% of Actual Flow
Temperature: ±0.15º F of Air Temperature
2.2 RANGE
Velocity Ranges:
User selectable via DIP switches.
0 to 500 FPM
0 to 1000 FPM
0 to 2000 FPM
0 to 3000 FPM
2.3 PROBE ASSEMBLY
Mounting:
Standard mounting bracket: 6063 aluminum
with four 0.25" holes for fasteners. ¼"
thick neoprene gasket.
Optional Type 316 stainless steel mounting
plate.
Length:
4”, 5”, 6”, 7”, 8”, 9”, 10”, 12”, 14”, and 16”
Sensors Per Probe:
4" probe, one sensor
5"-16" probes, two sensors
Probe:
Type: 6063 anodized aluminum. ½" diameter
tubing
Optional: Type 316 stainless steel
Sensor Housing:
Injection molded polycarbonate, UL94 V-0
rated.
Sensor Type:
Surface mount precision thermistor.

P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 7
SECTION 3.0: INSTALLATION
3.1 INSTALLATION
The ELECTRA-o/SD is intended for use in 4" to 16" ducts and in VAV terminal box applications in an
environment between -20° F to 120° F where it will not be exposed to rain or snow. The ELECTRA-o/
SD electronics enclosure is designed to be mounted to the exterior of the duct or VAV box with the
sensor probe inserted through the side of the duct or VAV box.
3.2 RECEIVING & INSPECTION
Carefully remove the ELECTRA-o/SD from the shipping container and inspect for any damage. If
damaged contact Air Monitor’s Service Department.
Verify that the shipping container includes the four self-tapping mounting screws in addition to this
IO&M manual.
3.3 PLACEMENT GUIDELINES
• Location of the ELECTRA-o/SD is critical for proper operation and accuracy of the airow measurement.
The installation locations shown below for typical applications are the minimum separation from a
source of airow disturbances (e.g. elbow, transition, duct take-off, etc.).
• If more than the minimum clearances are available, proportionally adjust the upstream and downstream
distances.
• Avoid locating the ELECTRA-o/SD where it will be subjected to condensing moisture from a coil.
• Contact Air Monitor’s Applications Engineering Department to discuss any sub-minimal installation.
• VAV Installations - Locate the ELECTRA-o/SD a minimum of 3" upstream of the VAV box or 3" upstream
of the location of a pneumatic ow ring (remove the ow ring). When mounting downstream of the VAV
box, position the ELECTRA-o/SD a minimum of one duct diameter downstream of the box.
VANED
ELBOW
.75X .5X
0.5X 0.5X 0.5X
1X
.75X1.5X
SWEEP
ELBOW
1X
0.75X
2X
BELLMOUTH INLETS
PLENUM
TAKEOFF
1.5X
DUCT
BRANCH
4X
Rectangular Duct: X = Circular Duct: X = Duct Diameter
Equivalent Duct Diameter X
H+W
2(HxW)
EXPANDING TRANSITION
≤
α
α
≤
ELBOW
UNVANED
REDUCING TRANSITION
2.5X 1X
DAMPERS
α
α

P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 8
3.4 MOUNTING
1. Determine the measurement location based upon the engineer’s plans and the ELECTRA-o/SD’s
minimum placement guidelines.
2. Note: It may be necessary to remove a portion of external duct insulation to allow the ELECTRA-o/
SD to be securely mounted to the exterior of the duct wall.
3. Remove the four screws (8-32 x .325) that attach the mounting bracket to the enclosure. Place the
mounting bracket against the duct wall where the ELECTRA-o/SD is to be mounted and trace the
large probe insertion hole in the center of the bracket onto the duct. See Figure 2.
4. Using a 3/4” hole saw, cut the insertion hole.
5. Place the mounting bracket centered over the insertion hole. Align the edge of the mounting bracket parallel
with the axis of the duct, then attach the mounting bracket to the duct using the provided sheet metal screws
( 8-32 x .75").
6. Place the probe through the mounting hole, center the gasket in the hole in the bracket so it makes contact
with the duct, then attached the enclosure to the mounting bracket at the four mounting holes using the four
screws (8-32 x .325") previously removed in Step 3 above.
Figure 2

P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 9
It is recommended that power wiring be 18 awg and signal wiring be 18 awg to 22 awg. 16 awg is the maximum wire
gauge that the terminals can accommodate. To aid the wiring process, terminals J1 and J2 are removable by pulling
the terminal strip straight up and off the circuit board. Once wiring has been completed replace the terminals by
aligning with the receptacle and pressing rmly.
The ELECTRA-o/SD can be powered by either 24VAC providing 20-28VAC or 24VDC providing 20-40VDC.
3.5 POWER/SIGNAL CONNECTIONS
The ELECTRA-o/SD provides dual analog outputs of airow velocity (or equivalent velocity pressure)
and temperature. The temperature output has a xed full scale range of -20º F to 120º F. The velocity
output can be scaled at one of four user selectable ranges.
Power wiring is done at terminal strip J1 and signal wiring is done at terminal strip J2. Both terminal strips
are located in the lower corners of the transmitter and are accessible by removing the enclosure cover. See
Figure 3. One ½" conduit opening is provided in the bottom of the enclosure for power and signal wiring.
Analog 1 Out (+)
Analog 1 Out (–)
Analog 2 Out (+)
Analog 2 Out (–)
J1
J2
24VAC neutral / 24VDC(-)
24VAC line / 24VDC(+)
!
CAUTION
To prevent damage to the ELECTRA-o/SD, the 24VAC/VDC power source must be turned off
before making the power and signal connections.
Flow Velocity/
Velocity Pressure
Temperature
}
}
Figure 3
Status LEDs

P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 10
3.6 CONFIGURATION
All device conguration is done using an 8-switch DIP package labeled S1 that can be accessed by removing
the enclosure cover. The protective shield over the circuit board also has a reference guide for setting all
device congurations. See Figure 4. Conguration settings can be changed while the device is powered.
Figure 4
Note: * denotes the default setting. All conguration settings are shipped from the factory in the default
mode.
SW1 & SW2 Analog Output Scaling
Up Up 0-3000 FPM* (or equivalent velocity pressure 0 - 0.560" w.c.)
Up Down 0-2000 FPM (or equivalent velocity pressure 0 - 0.249" w.c.)
Down Up 0-1000 FPM (or equivalent velocity pressure 0 - 0.062" w.c.)
Down Down 0- 500 FPM (or equivalent velocity pressure 0 - 0.16" w.c.)
SW3 & SW4 Output Filter
Up Up Off*
Up Down Light
Down Up Medium
Down Down Heavy
SW5 Airow or Equivalent Pressure
Up Airow*
Down Equivalent Pressure
SW6 & SW7 Analog Output Mode
Up Up 4 – 20 mADC*
Up Down 0 – 5 VDC
Down Up 0 – 10 VDC
Down Down 4 – 20 mADC
SW8 – Not used
FLOW*
SCALE
FLOW
PRESSURE
AO MODE
0-5VDC
0-10VDC
4S1 1 32
FILTER
5 6 87
4-20mA*
ANALOG
MODE SETUP
UP
DOWN
HEAVY
MED
LIGHT*
OFF
0-3000*
0-2000
0-1000
0-500
POSITION
SWITCH
USED
NOT
*DEFAULT

P.O. Box 6358 • Santa Rosa, CA 95406 • USA • Tel +1 (800) AIRFLOW • [e-mail]
ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 11
3.7 START-UP / OPERATION
1. After completion of all power and signal wiring, activate the 24 VAC / 24 VDC power source
2. Observe the Run Mode indicator located in the upper left corner of the board. See Figure 3. After a brief
initialization period the Run Mode LED will begin blinking on/off in ½second intervals indicating
normal operation.
3. Conrm the signals for airow (or equivalent pressure) and temperature are being correctly received
by the BMS or controller.
4. Replace the cover of the ELECTRA-o/SD making sure not to pinch any wires and secure in place
with the four screws. Do not over tighten.
3.8 LEDs
Alarm Flash Sequence – Error Codes
Flash Once = Cal Error
Flash Twice = Sensor 1 Bad
Flash Three = Sensor 2 Bad
Flash Four = No Cal Data
Flash Six = Unknown Error
3.9 ANALOG OUTPUT SIGNALS
Temperature: Available connector J2, terminals AO2+ and AO2-. The analog output for temperature is
xed scaled for -20º F to 120º F.
Airow: Available on connector, J2, terminals AO1+ and AO1-. When congured for airow velocity
(not equivalent velocity pressure), the analog output is scaled in FPM. To scale the airow signal in the
BMS or controller to volumetric ow, multiply the DIP selected velocity output scaling by an area factor
(in square feet) corresponding to the duct cross-sectional size at the mounting location. For example, the
selected airow velocity scale is 0-2000 FPM, the analog mode is 4-20 mA, and the device is mounted in
a 10" diameter round duct having a cross-sectional area factor of 0.545 square feet. The volumetric ow in
CFM corresponding to the full scale 20 mADC signal would be 1091 CFM (2000 FPM x 0.545 square feet).
Flash
On/Off
Flash
On/Off
RUN ALM NET DBG
Normal
Mode
Alarm
Mode

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ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 12
4.1 MAINTENANCE / INSPECTIONS
The ELECTRA-o/SD has been designed to operate in most HVAC applications without the need for
periodic maintenance or calibration. In some applications it may be necessary to perform a visual
inspection of the probe and sensors, and if necessary clean them using a soft, small brush and/or
compressed air to remove any accumulated particulate/debris.
4.2 TROUBLESHOOTING
The ELECTRA-o/SD is intended to provide long-term, trouble-free operation. In the event the BMS or
controller ceases to receive valid airow and/or temperature signal(s), check the following at the device
after removing the cover:
1. The power wiring is securely connected and providing the intended 24V AC/DC power.
2. The signal wiring is securely connected.
3. The Run Mode light is blinking on/off in ½second intervals indicating normal operation.
If after checking the above items normal operation is not restored, contact the factory Service
Department.
TECHNICAL SUPPORT
For technical assistance please contact the factory at:
[e-mail]
[phone], Ext 3
Hours: 8:00am – 5:00pm Pacic, Monday – Friday
SECTION 4.0: MAINTENANCE / INSPECTIONS

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ELECTRA-o SD Dual Analog Installation, Operation and Maintenance Manual 06/16 - 1035 Page 13
5.1 WARRANTY INFORMATION
Air Monitor Corporation (hereinafter referred to as “Seller”) warrants that at the time of shipment, products
sold pursuant to this contract will be free from defects in materials and workmanship and will conform to the
specications furnished or approved in writing by Seller. No warranty is given that delivered products will
conform to catalog sheets, data sheets, and the like, which are subject to change without notice.
Seller will repair or replace, at its option, any product listed under this warranty which is returned freight
prepaid to Seller within three (3) years after start-up or thirty-nine (39) months after shipment that upon test and
examination, proves defective within the terms of this warranty. The warranty period for the ELECTRA-o/SD
module repaired or replaced shall be for the time remaining on the warranty period of the original components.
Purchaser shall notify Seller in writing of such defect within sixty (60) days of discovery of the defect.
This warranty does not extend to any product sold by Seller which has been the subject of misuse, neglect,
accident, damage or malfunction caused by interconnection with equipment manufactured by others, improper
installation or storage, or used in violation of instructions furnished by Seller, nor does it extend to any product
which has been repaired or altered by persons not expressly approved by Seller. Nor does Seller warrant equipment
against normal deterioration due to environment; nor items such as lamps, glass, and similar items subject to
wear or burnout through usage. Adjustments for items or equipment not manufactured by Seller shall be made
to the extent of any warranty of the manufacturer or supplier thereof.
Seller shall not be liable for any special or consequential damages or for loss of damage, directly or indirectly
arising from the use of the products. Seller’s warranty shall be limited to replacement of defective equipment
and shall not include eld removal and installation expenses.
The warranty set forth above is in lieu of all other warranties either express or implied and constitutes the full
extent of Air Monitor Corporation’s liability to the customer, or any other party for breach of warranty.
THERE ARE NO EXPRESS WARRANTIES EXCEPT AS SET FORTH HEREIN AND THERE ARE NO IMPLIED
WARRANTIES OF MERCHANTABILITY OF FITNESS FOR ANY PARTICULAR PURPOSE, WHICH ARE
PARTICULARLY DISCLAIMED.
SECTION 5.0 – WARRANTY
Copyright © 2016 Air Monitor Corporation. All printed material
should not be changed or altered without permission of Air Monitor
Corporation. Any published technical data and instructions are subject
to change without notice. Contact your Air Monitor Corporation
representative for current technical data and instructions. All brand
names trademarks and registered trademarks are the property of their
respective owners. Information contained within this document is
subject to change without notice. Visit www.airmonitor.com to view
and/or download the most recent version of this and other documents.