Xylem H-3342 User Manual

Model

H-3342

Absolute Shaft Encoder with

LCD Display, SDI-12 and 4-20mA Outputs

Owner's Manual

Version 1.3

75 West 100 South, Logan, Utah 84321 Phone: [phone] Fax: [phone] Web: http://www.waterlog.com E-mail: [e-mail]

D E S I G N A N A L Y S I S A S S O C I A T E S , I N C .

75 West 100 South, Logan, Utah 84321 Phone: [phone] Fax: [phone] Web: http://www.waterlog.com E-mail: [e-mail]

D E S I G N A N A L Y S I S A S S O C I A T E S , I N C .

User Agreement/

WATERLOG Warranty

1. NATURE OF THE PRODUCT

This agreement accompanies a water level measuring system comprising firmware, circuitry and other
electronic equipment in an enclosed housing, and packaged together with written instructional materials.
The packaged electronic circuitry and instructional materials herein are collectively referred to as the
“PRODUCT.” The PRODUCT is made available from DESIGN ANALYSIS ASSOCIATES, INC., of
75 West 100 South, Logan, Utah 84321 (hereinafter referred to as “DESIGN ANALYSIS”), and contains
information and embodies technology that is confidential and proprietary to DESIGN ANALYSIS, and
the availability and use of the PRODUCT is extended to you, the USER, solely on the basis of the terms
of agreement which follow.

2. ACKNOWLEDGMENTS BY USER

Opening the package which encloses the accompanying PRODUCT indicates your acceptance of the
terms and conditions of this agreement and constitutes an acknowledgment by you of the confidential and
proprietary nature of the rights of DESIGN ANALYSIS in the PRODUCT.

3. DUTIES OF YOU, THE USER

In consideration for the access to and use of the PRODUCT extended to you by DESIGN ANALYSIS
and to protect the confidential and proprietary information of DESIGN ANALYSIS, USER agrees as
follows:

®

(a) USER agrees that they will not remove from the exterior of the housing of the

PRODUCT any safety warnings or notices of proprietary interest placed thereon by
DESIGN ANALYSIS.

(b) USER agrees that they shall not disassemble or otherwise reverse engineer the

PRODUCT.

(c) USER agrees to treat the PRODUCT with the same degree of care as USER exercises in

relation to their own confidential and proprietary information.

4. TERM

USER may enjoy these rights only as long as their possession of the PRODUCT shall continue to be
rightful. These rights will cease if the PRODUCT is returned to DESIGN ANALYSIS under the terms of
any redemption offer, warranty, or money-back guarantee, or if USER transfers the PRODUCT to
another party on terms inconsistent with this agreement.

5. LIMITED WARRANTY
(a) What is Covered

DESIGN ANALYSIS warrants that for a period of twelve months from the time of delivery the
functions to be performed by the PRODUCT will be substantially in compliance with USER
documentation. DESIGN ANALYSIS also warrants that the PRODUCT will be free from
defects in materials and workmanship for a period of ONE YEAR from the date of delivery.

(b) What USER Must Do

H-3342 User Agreement/WATERLOG Warranty W-1

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If the product fails to satisfy the above warranty, USER must notify DESIGN ANALYSIS in
writing within the applicable period specified above and reasonably cooperate with the directions
they received from DESIGN ANALYSIS.

(c) What DESIGN ANALYSIS Will Do

DESIGN ANALYSIS will repair the PRODUCT or will endeavor to provide a replacement of
same within a reasonable period of time. In the event that DESIGN ANALYSIS is unable to
make the necessary repairs or replacement within a reasonable period of time, the original
purchase price will be refunded upon the return of the PRODUCT to DESIGN ANALYSIS.

(d) Limitations

(i) THE ENTIRE REMEDY FOR BREACH OF THIS LIMITED WARRANTY

SHALL BE LIMITED TO REPLACEMENT OF THE DEFECTIVE PRODUCT
OR REFUNDING OF THE PURCHASE PRICE, AS SET FORTH ABOVE.
IN NO EVENT WILL THE LIABILITY OF DESIGN ANALYSIS TO USER
OR TO ANY OTHER PARTY EXCEED THE ORIGINAL PURCHASE PRICE
OF THE PRODUCT, REGARDLESS OF THE FORM OF THE CLAIM.

(ii) EXCEPT FOR THE EXPRESS WARRANTIES ABOVE, DESIGN ANALYSIS

SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, INCLUDING,
WITHOUT LIMITATION, ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

(iii) UNDER NO CIRCUMSTANCES WILL DESIGN ANALYSIS BE LIABLE

FOR SPECIAL, INCIDENTAL, CONSEQUENTIAL, INDIRECT, OR ANY
OTHER DAMAGES OR CLAIMS ARISING FROM THE USE OF THIS
PRODUCT, THIS INCLUDES LOSS OF PROFITS OR ANY OTHER
COMMERCIAL DAMAGES, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES. IN NO EVENT WILL DESIGN ANALYSIS BE LIABLE
FOR ANY CLAIMS, LIABILITY, OR DAMAGES ARISING FROM
MODIFICATION MADE THEREIN, OTHER THAN BY DESIGN
ANALYSIS.

(iv) THIS LIMITED WARRANTY GIVES USER SPECIFIC LEGAL RIGHTS.

USER MAY ALSO HAVE OTHER RIGHTS WHICH VARY FROM STATE
TO STATE. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW
LONG AN IMPLIED WARRANTY LASTS OR THE EXCLUSION OF
INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THOSE
LIMITATIONS OR EXCLUSIONS MAY NOT APPLY.

6. GOVERNING LAW

This Agreement and its validity and interpretation shall be governed by the laws of the State of Utah,
notwithstanding any choice of law rules of Utah or any other state or jurisdiction.

W-2 User Agreement/WATERLOG Warranty H-3342

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1.0 Introduction

Chapter 1

Introduction

The WATERLOG H-3342 is a digital shaft encoder which measures water depth by monitoring
the position of a float and pulley system. The H-3342 is easy to use and works with any SDI-12
data recorder. The “Serial-Digital Interface” is ideal for data logging applications with the
following requirements:

! Battery powered operation with minimal current drain
! Multiple sensors on a simple three-wire cable
! Up to 250 feet of cable between a sensor and the data recorder

(Use of H-423, SDI-12 to RS485 converter extends the range to 1000's of feet,
a H-4500 fiberoptic media converter works up to 1.2 miles)

The H-3342 has the following features:

! Non-contact optical encoder
! Absolute, shaft position is not lost if the power fails or is disconnected
! High resolution (65,536 counts/rev)
! ±32,768 max turns
! Zero backlash
! Scales the encoder position into user units of feet, meters, etc.
! Precision ball bearing design with special low temperature lubricant
! Threaded shaft compatible with existing pulleys
! Sealed enclosure protects from moisture and dirt
! Low current operation (less than 150 microamps typical standby)
! Water resistant connector provides easy hookup
! Continuous display readout always shows last measured value.
! ‘Read’ button causes the H-3342 to continuously update the display while the button is

pressed

! Front panel adjustment for manually setting the stage
! Front panel control for setting the SDI-12 address
! Optically isolated 4-20mA output

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H-3342 Introduction 1-1

1.1 Operation

The H-3342 is a precision shaft encoder with a resolution of 65,536 counts per revolution
(.000015 feet with 1.0 ft circumference pulley). Internally the H-3342 has two non-contact
encoders mounted on the same shaft. An optical encoder measures the shaft angle and a
magnetic turns counter counts the number of revolutions. The optical rotary position sensor
measures the shaft angle within a 360° range. As opposed to incremental encoders, the optical
encoder measures the absolute position rather than the change in position. Internally, an infrared
LED flashes through a circular bar code onto a linear array sensor. A microcontroller decodes
the image into a unique position. Due to manufacturing tolerances of the bar code, the accuracy is
less than the resolution; 4096 counts per revolution (.00024 feet with 1.0 ft circumference
pulley). The turn counter monitors complete revolutions of the shaft and can count up to
±32,768 revolutions. Together the encoders provide an “absolute” measurement. The shaft
position will not be lost if the power is removed, even if the shaft rotates while the power is off.

During normal operation, the SDI-12 data recorder sends an address together with a command to
the H-3342. The H-3342 wakes up from its low power sleep mode, converts the shaft position
into feet, meters or other units and stores this data in its data buffer. Once the data is ready, the
data recorder collects the data from the H-3342's data buffer.

1.2 LCD Display

The H-3342 has a 4-1/2 digit LCD display which shows the last measured value. The display
uses negligible power and is always visible. The display will show either ±199.99 or ±19999
digits depending on how the H-3342 is configured.

1.3 “Read” Button

When pressed, the ‘Read’ button causes the H-3342 to continuously make measurements and
update the display. The “±” sign flashes while making measurements indicating the display is
being updated even if the value is not changing. When the button is released the display will
hold the last measured value. Measurements initiated from an attached SDI-12 data logger will
also cause the display to update.

1.4 Using the Adjust Knob to Change the Stage

The offset adjustment is a rotary digital encoder which is accessed by removing the attached dust
cover. The encoder has a slot and is easily rotated with a screwdriver or other flat blade tool.
Replace the dust cap whenever the adjustment is not being used.

While the ‘Read’ button is pressed, the Adjust screw may be turned to increase or decrease the
current Stage reading. Turn the adjustment screw clock-wise to increase the Stage and counter-
clock wise to decrease the Stage. Turning the adjust screw slowly will change the hundredths
digit while turning the screw fast changes the tenths digit. This allows one control to make both
fine and course adjustments.

1-2 Introduction H-3342

1.5 Using the Adjust Knob to Change SDI-12 Address

If the ‘Read’ button is held down while the H-3342 is being powered up, the display will show
the H-3342's current SDI-12 address. The SDI-12 address may be changed using the Adjust
screw. Turning the Adjust screw will change the address in the range of 0 to 9. When the Read
button is released, the new SDI-12 address is saved and the display switches to the normal stage
readout. To change the SDI-12 address again, the power must be disconnected and the special
power-up sequence repeated. The H-3342's address may also be changed with an extended SDI­12 command (See Chapter 3).

1.6 4-20mA Output

The H-3342 has a 12-bit digital-to-analog converter (DAC), precision voltage reference and a 4­20mA current transmitter. The SDI-12 and 4-20mA sections are isolated from each other with a
high voltage digital opto-coupler. The Stage is scaled into a 12-bit value and loaded into the
digital-to-analog converter to control the current transmitter.

The 4-20mA output is updated whenever a measurement is made. If no measurements are made,
the 4-20mA output becomes “stale”. For industrial applications where the H-3342 is connected to
a SCADA or PLC system and low-power is not of concern, the H-3342 can be programmed to
make continuous measurements. See Chapter 3 for details. The H-3342 comes from the factory
with the power mode set to the Sleep mode.

Note: When the H-3342 is first powered up, the output current is set to 4.0mA. It remains at

4.0mA until the first measurement sequence. The digital-to-analog converter is powered from

the loop side of the opto-isolator. If the loop power is disconnected or is applied after the SDI-12
side is powered up, the data in the digital-to-analog converter will be lost. When the loop power
is restored, the 4-20mA output will be at an unknown value. Once a fresh SDI-12 measurement
is made, the digital-to-analog converter will be loaded with new valid data.

H-3342 Introduction 1-3

1-4 Introduction H-3342

Chapter 2

H-3342 Installation

2.0 Installation

The H-3342 is suitable for outdoor environments but must be installed in a protective enclosure
or gauge house. Normally, the H-3342 is screwed or bolted to a shelf in the gauge station with
the pulley and tape protruding over the edge of the shelf above the water. Make certain the
housing is level and the pulley and tape do not rub on any obstructions.

2.1 Making Output Connections to the H-3342

The H-3342 is a SDI-12 V1.2 compliant sensor. It connects directly to any data recorder with
SDI-12 capability. In addition, the H-3342 has an optically isolated, 4-20mA output.

The power for the H-3342 is supplied
by the +12Volt DC input. The table
below shows the proper connections.
The wiring diagram is printed on the
H-3342's housing. A 6-conductor
cable is supplied with the H-3342.

Cable Connections

Pin Wire Name

A
B
C
D
E
F

Red
Black
Green
Yellow
Orange
Brown

+12Volt DC
Ground
Ground
SDI-12 Data
4-20mA +
4-20mA -

H-3342 Installation 2-1