PARSE 

AMASSER SDI-12

Pliant Automatic Reeler with Shaft Encoder

Pliant Technology Specialists


Pliant : readily yielding to influence

PARSE SDI-12 Water Monitoring System

General Description:

The PARSE (Pliant Automatic Reeler with Shaft Encoder) is an innovative approach to water level monitoring that is ideal for groundwater wells but also suitable for stilling wells.It is more robust, accurate and reliable than pressure transducer installations.It combines the calibration system of current groundwater installations with the high resolution and reliability of a shaft encoder.Current installations of equipment at groundwater and stilling wells require a device with a water-sensing plumb-bob mounted to a graduated tape in order to set the initial water level.Regular visits to the stations are also required in order to ensure that the equipment is accurate as verified with the “plumb-bob” device.
The PARSE features an automated version of the “plumb-bob” calibration device combined with the PSE-SDI shaft encoder.The PSE-SDI provides the fluid tracking as well as the control algorithms for the DC motor which drives the reel-mounted graduated tape.These algorithms allow various functions such as:“Measure”, “Hold Position”, “Reel up”, etc…The resolution of the system is 1/384th of a revolution, that is, with a 375 mm circumference pulley the resolution is less than a millimetre.

The Display Option “\D”

The “\D” option provides an 8-digit display and two double-position switches for on-site viewing and set-up without the use of a laptop (order PARSE\D).This product, the PARSE\D, has all the features of the standard PARSE but in addition to its SDI-12 communication capability has two double-position switches that can be used to view the current fluid level or tape position as well as set up the following parameters on the 8-digit display : the encoder scale and initial water level, the device address.
The switches also allow the various PARSE functions which are otherwise accomplished via SDI-12 commands, that is, “Measure”, “Hold Position”, “Reel up”, etc…

Note that although the fluid level is readily accessible from the display the setup parameters are in fact password-protected thus ensuring the integrity of your results.


PARSE/D: Pliant Automatic Reeler with the Display option

The PARSE Measurement Cycle

The host (usually a logger) instructs the PARSE to measure the current water level with the appropriate SDI-12 command.The shaft encoder then maximizes its sampling rate as the DC motor lowers the tape and plumb-bob towards the surface of the water.The motor control algorithm ensures that the PARSE immobilizes for several seconds the moment it touches the water.This delay time allows the user to take a visual reading of the tape in cases where the measurement was initiated manually.
The measurement cycle is completed when the tape and plumb-bob are raised approximately 12 cm above the surface of the water and the shaft encoder returns to the reduced sampling rate (quiescent mode).The whole cycle only takes a few seconds after which the PARSE is in position and ready for the next measurement.

Mechanical Interface

The PARSE comes complete and ready to install.The aluminium reel holds 15 m (standard) of punched & graduated tape that engages the 3-pin pulley mounted on the shaft encoder.The plumb-bob is shipped with the unit.Longer tape and/or extensions are available.Please inquire.

Equipment Interface

Intelligent SDI-12 communications-based shaft encoder with programmable offset and units per revolution settings. Hardware includes a +10.5 to14V input for external battery, charger or solar panel and a 9 V alkaline battery to provide backup in the event of power supply interruption.
The SDI-12 host is generally a data logger such as the PDAS-II but can also be a direct interface between your PC and the shaft encoder such as the PCOM-SDI.It is also possible to connect directly to the PMDM/V Environmental Modem without any logger.

Specifications

Processor : Atmel 89S8252 @ 3.6864 MHz.


Word Size : 8 bit data - 8 bit instruction
Memory : 89S8252, 256 bytes RAM
EEPROM 2 kbytes for storage of set-up and device address data.

Shaft Encoder

K-Model


Sensor type - two channel optical incremental encoder 96 x 4 counts per revolution
Resolution - 384 counts per revolution;
software conversion to engineering units provided in firmware. (Units per revolution)

Range

+/- 32.0 meters with .375 meter circumference pulley


+/- 85.3 feet with 1.00 foot circumference pulley

Reeler

Cramer DC Motor: nominal 12VDC, voltage regulated
MAX. speed: 30 RPM (about 7 meters/min) 
Pulsing Mode engaged when water sensing

Pulley, Tape & Plumb-bob

Tape: 15 m (standard) punched & graduated
Shaft encoder pulley: 3-pin, 375mm circumference (standard) 
The plumb-bob is shipped with the unit

Output

SDI-12 protocol : ASCII (water-level)

Power Supply

Configured for external 12 V lead-acid battery


9 V 565 mAHr alkaline battery backup
(Only if 9 pin connector is mounted)

Connector

9 pin AMP CPC Connector


Current Carrying Capability - 1.5 Amp rating
Dielectric Withstanding Voltage >1500V

Power Consumption

DC Motor in reeler: >60mA under load; 0mA between measurements; >500mA peak during startup
PSE-SDI Shaft encoder: >5 mA quiescent current between measurements (reduced sampling rate); > 30 mA with maximum sampling rate of shaft position occurring during the measurement cycle

Physical Characteristics

The shaft encoder and reeler system that comprise the PARSE are combined on a mounting bracket.The whole unit provides for installation with five #10 holes for screws or bolts (not included).Each component is as follows:
PSE-SDI:

Height : 152.0 mm. (6.0 in.)
Width : 114.0 mm. (4.5 in.)
Depth : 70.0 mm. (2.75 in.)
Weight : 1.35 Kg (3.0 lb.)

REELER:

Height : 115.0 mm. (4.5 in.)
Width : 70.0 mm. (2.75 in.)
Depth : 65.0 mm. (2.5 in.)


Environmental Characteristics

Operating : -40 to +55 C
Storage : -60 to +100C
Humidity : <= 100% non-condensing
 
 
 

The above information is believed to be true at the time of printing. AMASS Data Technologies Inc. reserves the right to modify specifications without notice. All trademarks are owned by their respective companies.

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