Accutron I.S. DRIFT User manual

I.S.
I.S.I.S.
I.S.
DRIFT /
DRIFT /DRIFT /
DRIFT /
I.S.
I.S.I.S.
I.S.
FAN
FAN FAN
FAN
Intrinsically Safe Airflow Metering Systems
Technical / Operations
Manual
ManualManual
Manual
MODEL:
ACCIS-SYS-002-DR (Drift)
ACCIS-SYS-002-FN (Fan)
V07.10.2020
For more information on our products visit www.accutroninstruments.com
Contact us by email: [email protected]m
Or by phone: [phone]

1
IMPORTANT NOTICE
The Accutron IS family of instruments is the exclusive copyright properties of Accutron Instruments Inc.
Accutron Instruments Inc. reserves the right to make changes to the Accutron products and manuals without further
notice to improve reliability, function or design. Accutron Instruments Inc. does not assume any liability arising out
of the application or use of any product described herein, nor does it convey any license under its patent rights, nor
the rights of others.
The documentation supplied is for the purpose of furnishing users of Accutron products with technical information
on how to install, use, and maintain the various instruments. It is forbidden to use any Accutron documentation for
any other purpose that may be detrimental to the interests of Accutron Instruments Inc.

2
Table of Contents
S E C T I O N 1 - G E N E R A L I N F O R M A T I O N
The Manual ................................................................................. 4
Safety Guidelines ............................................................................ 5
Information About Your System .................................................. 5
Specifications for the Accutron IS Drift/Fan .................................. 6
S E C T I O N 2 - I N S T A L L A T I O N
System Explanation ........................................................................ 7
Choosing a Location ....................................................................... 8
Mounting the Display ..................................................................... 8
Mounting the Sensors ..................................................................... 9
Connecting the Sensor Cables ........................................................ 9
S E C T I O N 3 - P R O G R A M M I N G
Navigation Buttons ......................................................................... 10
Programming Data Sheet ................................................................ 11
Auto Range Feature ........................................................................ 12
Quick Start Programming ............................................................... 13
Menu Flow Chart ............................................................................ 14
Detailed Menu Setup....................................................................... 15
S E C T I O N 4 - M O D B U S
RS485 Settings ............................................................................... 19
Modbus Register ............................................................................ 19
Modbus Connection ........................................................................ 20
S E C T I O N 5 - T R O U B L E S H O O T I N G
FAQ (Frequently Asked Questions) .............................................. 21
Troubleshooting Flowchart ............................................................ 23

3
A P P E N D I X A
Glossary ................................................................................. 25
Equations ................................................................................. 26
Accutron IS Drift Parts List ............................................................ 27
Accutron IS Fan Parts List.............................................................. 28
Component Check List ................................................................... 29
A P P E N D I X B - D I A G R A M S
Wiring Diagram .............................................................................. 30
Enclosure Dimensions .................................................................... 31
Accutron IS Drift Transducer Dimensions ..................................... 32
Accutron IS Drift Mounting Dimensions ....................................... 33
Accutron IS Fan Transducer Dimensions ...................................... 34
Accutron IS Drift System ............................................................... 35
Accutron IS Fan System ................................................................ 36

4
Section 1 - General Information
The Manual
Refer to this manual for proper installation, operation and maintenance of the Accutron IS
Instrument.
Special attention must be paid to warnings and notices highlighted from the rest of the text by
gray boxes.
Warning: means that failure to observe the necessary precautions can result in death, serious
injury, and/or considerable material damage.
Note: means important information about the actual product or a specific section of the
operating manual.
• These instructions do not claim to cover all details or variations in equipment, or to provide
for every possible contingency that may arise during installation, operation, or maintenance.
• For further information or to resolve issues not covered in the manual, consult your Accutron
representative.
• The contents of the manual shall not become part of or modify any prior or existing
agreement, commitment or relationship. The Sales contact contains the entire obligation of
Accutron Instruments Inc. The warranty contained in the contract between the parties is the
sole warranty of Accutron Instruments Inc.
IMPORTANT: All specifications are subject to change without notice. Please ensure that
any safety-related information is confirmed with a qualified Accutron Instruments
representative.

5
Safety Guidelines
Warning notices must be observed to ensure personal safety as well as that of others, and to
protect the product and the connected equipment.
This device/system should only be set up and operated in conjunction with this manual.
Qualified personnel are only authorized to install and operate this equipment in accordance with
established safety practices and standards.
Warning: This product can only function properly and safely if it is correctly transported,
stored, installed, set up, operated, and maintained.
Note: Always use product in accordance with specifications.
Information About Your System
When you first open your Accutron IS unit, be sure to record the following:
Model Number (located behind door): _______________________________
Serial Number (located behind door): _______________________________
Code version (displayed on startup): _______________________________
Note: If you need to contact Customer Service, this information will be beneficial.

Specifications for the Accutron IS Drift/Fan – Airflow Sensor
Connections: Screw terminal Block Type
Transducers: 3 ½” (Dia.) X 9 1/8” (L)
Display Readout: 16 Characters LCD display.
Each digit is 0.57” (H) X 0.24” (W)
Power Supply: 12.6 VDC intrinsically safe power supply
Power Consumption: < 3.3 watts
Input Power: 12.6 VDC
Display Units: M/S, CFM, KCFM, M**3/S, FPM
Temperature range: -40°to +60°Celsius
Accuracy: 2% FS or ±0.05 M/S (whichever is greater)
Output type: 4-20mA
Output modes: Normal, Reverse, or Split (used for bi-directional measurements)
Fault/Alarm Output: (Not available at this time)
Sensor cables: 100 feet STD (sensor-to-box). Custom cables up to 500ft.
Connectors: Stainless Steel, with O-ring seals. IP68 rated.
Sensor Mounting: Industrial CATV pan and tilt mount (non-aluminum)
Tunnel sizes: Can accommodate a face-to-face distance of 70 feet.
Programming: User interface onboard using navigation buttons.
Max Airflow: 0 to 40 m/s and higher (essentially no practical upper limit)
Bi-directional
Power Supply port parameters (J1): Ui = 12.6V, Ii = 2.5A, Ci = 0uF, Li = 0uH
Isolated Modbus port parameters (J3): Ui = 5.88V, Ii = 3.25A / 0.5A thermal, Ci =0.3uF, Li = 0uH
Isolated 4-20mA Output port parameters (J2): Ui = 28V, Ii = 93mA / 106mA thermal, Ci = 1uF, Li = 5uH

7
Section 2 – Installation
System Explanation
The Accutron airflow sensors are compact and reliable instruments, especially designed for
measuring airflows in mine environments. The Accutron IS Drift System is for airflow
measurements in mine drifts whereas the Accutron IS Fan System is for measuring the flow
output of large mine fans. Each system consists of an Indicating Transmitter, cabling and two
“ultrasonic sensor” assemblies.
The ultrasonic sensor assemblies are installed in the drift diagonally (one further upstream than
the other) with an “imaginary line” between them intersecting the airflow at a typical angle of
120 degrees.
Ultrasonic pulses are sent back and forth between the transducers across the drift, traveling
through the air current. Let “TA-B” be the time taken for the signal to travel from Transducer Ato
Transducer B, and “TB-A” be the time taken for the pulse to travel from Transducer Bto A. The
control unit accurately measures the time-of-flight for each direction. The difference between
the measured times (TA-B – TB-A) is directly proportional to the airflow. In the case of no moving
air, TA-B equals TB-A and there is no time difference because there is no airflow.
The Accutron IS first internally computes the average velocity of the air in Meters/Sec. In order
to obtain air volumes, the area of the drift is entered into the settings menu (during
programming), along with your selection of measurement units. The system then displays air
volumes in the units selected. Common units used in mining applications are KCFM and
M**3/S, other units may also be displayed to measure the air velocity (Meters/ sec, Feet / Min).
After installation in the drift, measurements are made (area, baseline distance, Face-to-face
distance). Using the navigation buttons, these parameters are entered into the unit.
These parameters are retained in non-volatile Flash memory in the Accutron. Whenever the
Accutron powers up, this information is automatically reloaded.
The system can easily measure air velocities in excess of 1,000,000 cfm with a precision better
than any other conventional methods, as well as low velocity conditions, i.e. 1m/s. In addition,
since the system is able to sample across the entire drift, readings are more representative than
“single point” measurements. The Accutron takes into account the fact that there is a
“distribution profile” for the air in the drift, making it superior to other types of measurement
methods for fixed installations.

8
Choosing a Location
The best location to install the instrument is in a straight section of tunnel that is at least 3 tunnel
widths long. In such a section, the airflow distribution will be well behaved with a maximum
airflow in the center and minimum airflow on the sides (Figure A). We should try to avoid
locations where the airflow is concentrated in one of the corners (Figure B).
The imaginary line between the Accutron sensors works like a “virtual pitot tube” and all flow
measurements occur along this line. In practice, best results are produced when this “imaginary
line” passes through the center of the tunnel, slicing through the airflow distribution profile in a
representative way.
It is also a good idea to carry out and record a 9-point manual airflow survey to verify the airflow
distribution and identify it as a suitable location.
Note: If we need to measure airflow in a less-ideal location. We may need to manually adjust
the calibration correction factor to give accurate flow readings. In this case, the instrument
would be calibrated against a handheld anemometer.
Mounting the Display
When planning to mount the control unit, you must take into consideration the availability of the
power source, the 4-20mA output signal, i.e. PLC connection, and the sensor cable lengths. In
most cases the control box is mounted on the wall in an electrical room. Extended sensor cable
lengths are available for distances greater than 100 feet.

9
Mounting the Sensors
When planning a mounting location for the wall mount sensors, we recommend mounting one
sensor near the top of the drift or duct and the other sensor located near the bottom downstream
from the first on the opposite side, with an “imaginary line” between them intersecting the
airflow at a typical angle of 120 degrees.
Airflow
End View Plan View
Illustration of typical mine drift installation
Downstream
Sensor
Upstream
Sensor Upstream
Sensor
Downstream
Sensor
Face to Face
Once the mounting brackets are installed, thread the sensors onto the mounts and align them at
each other using the pan/tilt adjustment on the bracket.
Connecting the Sensor Cables
A common mistake made is improperly installing the sensor cables. These must be threaded all
the way to ensure proper functionality.