OSI ORG-815-DS User manual

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS USER
GUIDE
1102
-
916
ORG815DS User Guide 190809.docx
USER'S GUIDE
ORG-815-DS
OPTICAL PRECIPITATION SENSOR
Revisi n 08/09/19
OPTICAL SCIENTIFIC INC
2 Metropolitan Ct. Suite 6
Gaithersburg MD 20878 USA
Tel: [phone]
Fax: [phone]
http://opticalscientific.com

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS
USER'S GUIDE
1102-916 2
Rev.
8/12/2019
Revisi n Rec rd
Rev Date
Descripti n f Changes
6/28/00 Changes company name from ScTi to OSI added revision log
7/25/00 Added new mounting bracket details to Sec 2.2 updated TST-700 to
TST-800 and PSB-715 to PSB-815
05/05/10 Re-edit User’s guide to current level.
12/02/10 Make specific for ORG 815-DS
01/14/11 Restore “Q” poll and other edits per customer request
03/07/14 Add erratum notes re: firmware 42S dated 07/19/12
“A” Poll 17 byte data length in Section 4 to be ignored
Remove QwikCollect Software reference
09/08/16 Update cable to include 1102-302-4
03/15/17 Added MODBUS-RTU capability re: firmware 44s dated 03/15/17
and later
05/11/17 Corrected DC wire assignment Fig. 2.5
04/18/18 Add LDM option and Appendix A
05/16/18 Update Tech Support & Customer Service phone numbers
02/25/19 Update Figures 1.1 1.2 and 1.3
08/09/19 Heater status added on byte 20 (4th byte of status code)
Read the entire User=s Guide before proceeding
with installation or maintenance of the ORG!

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS
USER'S GUIDE
1102-916 3
Rev.
8/12/2019
TABLE OF CONTENTS
1 INTRODUCTION TO THE ORG-815-DS OPTICAL PRECIPITATION GAUGE ..................... 6
1.1 The ORG-815-DS Improves Your Ability To Measure Rain And Snow ......................... 6
1.2 Performance Specifications for the ORG-815-DS ........................................................... 8
1.3 Basic Sensor Description .............................................................................................. 10
1.4 Accessories For The ORG ............................................................................................ 12
2 INSTALLATION OF THE ORG-815-DS ................................................................................. 13
2.1 Siting and Installation Guidelines .................................................................................. 13
2.2 Mounting the ORG-815-DS ........................................................................................... 14
2.3 Connecting the ORG Sensor ......................................................................................... 16
2.3.1 Connecting the Digital ORG Sensor Cable 1102-302-3 ............................................ 16
2.3.2 Connecting the Digital ORG Sensor Cable 1102-302-4 ............................................ 18
3 ORG THEORY OF OPERATION ........................................................................................... 20
3.1 Overall System Theory .................................................................................................. 20
4 USER INTERFACE / ORG OPERATION .............................................................................. 22
4.1 RS-232 ORG Interface .................................................................................................. 22
4.1.1 "A" Poll Response ...................................................................................................... 24
4.1.2 "B" Poll Response ...................................................................................................... 25
4.1.3 "C" Poll Response ..................................................................................................... 26
4.1.4 "D" Poll Response ..................................................................................................... 28
4.1.5 "Q" Poll Response ..................................................................................................... 29
4.1.6 "R" "V" & "Z" Poll Responses .................................................................................. 30
4.2 ORG Operation Examples ............................................................................................. 31
4.2.1 Typical ORG-815-DS Output ..................................................................................... 31
5 MODBUS Communication ...................................................................................................... 33
5.1.1 MODBUS RTU Protocol ............................................................................................ 33
6 MAINTENANCE & TROUBLESHOOTING THE ORG-815-DS ............................................. 35
6.1 Routine Maintenance and Quick Check ........................................................................ 35
7 Appendix A - Limited Distance Modem Option ...................................................................... 37
8 TECHNICAL SUPPORT ......................................................................................................... 38
8.1 Before Contacting Technical Support ............................................................................ 38
8.2 Factory Service .............................................................................................................. 38
LIST OF FIGURES
Figure 1.1 OSI ORG-815-DS Series Optical Sensor....................................................................... 7
Figure 1.2 ORG-815-DS Dimensions .............................................................................................. 9
Figure 1.3 ORG-815-DS Major Components ................................................................................ 11
Figure 1.4 PSB Electrical Box ....................................................................................................... 12
Figure 1.5 Limited Distance Modem .............................................................................................. 12
Figure 2.1 Installing Mounting Bracket & U-Bolts .......................................................................... 14
Figure 2.2 Typical ORG Installation............................................................................................... 15
Figure 2.3 Cable 1102-302-3 ......................................................................................................... 17
Figure 2.4 PSB Connections for 1102-302-3 ................................................................................ 17
Figure 2.5 Cable 1102-302-4 ......................................................................................................... 19
Figure 2.6 PSB Connections for 1102-302-4 ................................................................................ 19
Figure 3.1 ORG 815 Sensor Block Diagram ................................................................................. 21
Figure 5.1 ModBus Example Screen ............................................................................................. 33
Figure 5.2 ModBus Master Screen ................................................................................................ 34
Figure 6.1 Comb Test Illustration .................................................................................................. 36
Figure 7.1 Limited Distance Modem .............................................................................................. 37

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS
USER'S GUIDE
1102-916 4
Rev.
8/12/2019
CAUTIONARY NOTES
Note :
Used to call attention to a special feature or procedure which
must be followed for correct operation of the equipment
Caution :
Used to call attention to a concern where damage
to the equipment or injury to personnel may occur
unless certain steps are followed
Warning :
Used to call attention to a concern where serious personal
injury or death may occur unless basic safety
procedures are follow ed
WARRANTY
Optical Scientific warrants its products to be free of defects in workmanship
and material for a period of 12 months from date of shipment. During the
warranty period OSI will repair or replace defective products at its own
expense subject to the following conditions:
1. The Buyer prepays all shipping insurance and associated costs to
return the defective item to OSI. OSI pays return shipping and insurance.
2. The product must not have experienced misuse neglect accident
or have been altered or repaired by the Buyer during the warranty period.
3. This warranty and OSI's obligation are in lieu of all other warranties.
Implied warranties shall not apply.
4. OSI is not liable for consequential or incidental damages labor
performed in conjunction with removal and replacement loss of production or
any other loss incurred because of interruption of service or production of
incorrect or incomplete weather information.
Disclaimer
Optical Scientific Inc. will not be held liable for any accident injury or
damage incurred while installing operating or servicing this equipment; or as
a result of improper installation or operation. Implementation and enforcement
of proper safety procedures is solely the responsibility of the user user
employees or contracted personnel.

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS
USER'S GUIDE
1102-916 5
Rev.
8/12/2019
GLOSSARY
AC Alternating Current
AGC Automatic Gain Control
AWG American Wire Gauge
ASCII American Standard Code For Information Exchange
ASOS Automated Surface Observing System
CR Carriage Return
CTRL Control
CXR Carrier Signal
CW Continuous Wave
DC Direct Current
FAA Federal Aviation Administration
LDM Limited Distance Modem
LED Light Emitting Diode
IR Infrared
MOV Metal Oxide Varistor
NEMA National Electrical Manufacturer's Association
NWS National Weather Service
ORG Optical Rain Gauge
PSB Power Supply Box
PTC Positive Temperature Thermistor
RX Receiver
OSI Optical Scientific Inc.
TX Transmitter
VDC Voltage Direct Current
ENGLISH/METRIC CONVERSION FA
CTORS
1 inch = 25.4 mm 1 mm = 0.039 in
1 foot = 0.305 m 1 meter = 3.28 ft
1 pound = 0.454 kg 1 kilogram = 2.2 lbs
ΕF = 9/5 ΕC + 32 ΕC = 5/9( ΕF – 32)

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS
USER'S GUIDE
1102-916 6
Rev.
8/12/2019
1 INTRODUCTION TO THE ORG-815-DS OPTICAL PRECIPITATION GAUGE
1.1 T HE ORG-815-DS I MPROVES Y OUR A BILITY T O M EASURE R AIN A ND S NOW
The ORG7 measures rain and snow and applies algorithms to automatically determine the
precipitation type rate and water equivalent accumulation. The ORG is vastly superior to
traditional type sensors and offers the reliability and proven performance you need!
OSI's ORG-815-DS precipitation sensor provides accurate measurement of precipitation in all
weather conditions. Designed for rugged unattended operation ORGs have been field
proven in adverse environments around the world and unlike other sensors on ocean
deployed data buoys and ships.
Optical Measurement Benefits
OSI Optical Rain Gauges are not affected by many of the environmental factors which cause
significant errors with traditional rain and snow gauges. Applications using traditional gauges
such as tipping bucket siphon weighing and electrical grid type gauges can all be upgraded
with the OSI ORG sensors. OSI ORG's have many advantages including:
Τ
ΤΤ
Τ Easy Installati n Τ
ΤΤ
Τ Wide Dynamic Range
Τ
ΤΤ
Τ High Sensitivity Τ
ΤΤ
Τ N Evap rati n r Splash Err rs
Τ
ΤΤ
Τ L w Maintenance Τ
ΤΤ
Τ W rks n Ships & Bu ys
Τ
ΤΤ
Τ Minimal Wind Effects Τ
ΤΤ
Τ Operates 24/7/365
Now with available 5-sec update rates for fine structure analysis of rain intensity!
Reliability
The electro-optical design provides for an extremely reliable sensor with a calculated MTBF
in excess of 60 000 hours. Unlike mechanical gauges which collect precipitation to measure
it the ORG has no collectors buckets or siphons to corrode or clog. The sensors use AGC
circuitry to eliminate the effects of LED output power or dirty optics. In fact sensor
performance is maintained even when over 75% of the light is blocked! Diagnostics alert the
user if the signal strength is too low for normal operation. Preventative maintenance
suggested every 6 months is as simple as cleaning the 2 optical windows on the unit.
Pr ven Techn l gy
The ORG-815-DS sensors are based on technology developed and patented by OSI. OSI
has been granted patents in the following countries: USA 4754149 UK 22001510 and
Canada 1285044. This technology is the basis for the present weather sensor supplied to the
FAA/NWS/U.S. Navy for the Automated Surface Observing System (ASOS).

OPTICAL SCIENTIFIC, INC.
1102-916
Figure
ORG
ORG
-
815
-
DS
USER'S GUIDE
7
Rev.
Figure
1.1 OSI ORG-815-DS Series Optical Sensor
ORG
7 is a registered trademark of OSI.
USER'S GUIDE
Rev.
8/12/2019

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS
USER'S GUIDE
1102-916 8
Rev.
8/12/2019
1.2 P ERFORMANCE S PECIFICATIONS FOR THE ORG-815-DS
The ORG-815-DS is designed to measure rain and snow in all weather conditions.
Performance Specification
Rain Dynamic Range 0.1 to 500 mm/hr
Rain Accumulation 0.001 to 999.999 mm
Rain Accuracy 5% Accumulation
Rain Resolution 0.001 mm
Snow Dynamic Range 0.01 to 50 mm/hr water eq.
Snow Accumulation 0.001 to 999.999 mm water eq.
Snow Accuracy 10%
Snow Resolution 0.001 mm
Time Constant 10 seconds
ORG Data Update Rate Once per minute - typical Every 5 seconds - available
Electrical Specification
Supply Voltage 11 - 16 VDC
Current Drain
(Current drain depends on
ambient temperature - see
Section 1.3 for details)
400-800 ma
Fusing User supplied 1.0 A Slow Blow
Signal Output RS-232
User Heater Control n/a
Transient Protection All power and signal lines protected by MOV

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS
USER'S GUIDE
1102-916 9
Rev.
8/12/2019
Environmental Specification
Temperature -40 to 50ΕC (-40 to 122ΕF)
Humidity 0-100%
Precipitation/Dust NEMA-4 type protection
Physical Specification
Size 763 mm L x 254 mm W x 102 mm H
Weight 3 kg w/o cables
Cable Length 15 meter
Figure 1.2 ORG-815-DS Dimensions

OPTICAL SCIENTIFIC, INC.
ORG
-
815
-
DS
USER'S GUIDE
1102-916 10
Rev.
8/12/2019
1.3 B ASIC S ENSOR D ESCRIPTION
Precipitation is measured by detecting the optical irregularities induced by drops falling
through an infrared optical beam. These irregularities known as scintillation have
characteristic patterns which are detected by the sensor and converted to precipitation rate.
OSI's optical precipitation sensors measure rain and snow by detecting the optical
irregularities induced within the sample volume by precipitation particles falling through a
beam of partially coherent infrared light. These irregularities are known as scintillation. The
twinkling of stars is a familiar example of scintillation. By detecting the intensity of the
scintillations which are characteristic of precipitation the actual rainfall rate can be
determined.
The ORG consists of 1) a head frame which contains the transmit head receive head and
electronics and 2) a 15 meter long power/signal cable P/N 1102-302. The small box
(transmit) contains an IRED diode and lens with disk heater. The large box (receive) contains
a photodiode lens with aperture slit disk heater electronics external thermistor probe and
connector for the signal/power cable. All wiring between the transmit and receive heads is
within the frame.
The transmit and receive lenses are heated by self-regulating positive temperature coefficient
(PTC) thermistor disks to a point above ambient temperature to reduce dew frost and snow
buildup on the lenses. Depending on the ambient temperature the current drain for the lens
heaters can change more than 200 ma.
Data input and output are RS-232 digital expressed in ASCII characters
The ORG is completely sealed from water intrusion at the factory. Care should be taken to
maintain the unit’s watertight integrity.
Note :
The O G contains no user-serviceable parts - do not attempt to open it!
Doing so will compromise watertight seals and void any warranty.