Pentair Greenspan PS7000 User manual

PENTAIR ENVIRONMENTAL SYSTEMS
Version 1.1

Thank you for purchasing the Greenspan Pressure Sensor Model PS7000. This manual provides a guide to the
configuration, operation and maintenance of these sensors to provide long term reliable and accurate monitoring.
The Greenspan PS7000 is fully submersible Pressure Measurement Sensor designed for remote applications. It
utilises a sophisticated capacitive ceramic pressure sensitive diaphragm. Its special features include high overload
protection (up to 60 times nominal pressure) corrosion resistance and long term stability. The change in the
capacitive element varies with applied pressure. This variation is measured by an electronic circuit and converted
into an analogue output. The sensor can be supplied in a variety of standard ranges.
The PS7000 has a standard, 2-wire, loop powered, 4-20mAoutput with an option for 0-2.5Vdc suitable for a wide
range of Data Loggers, Process Controllers and other third party devices. New features include the ability to re-
range the sensor as well as adjust the fluid density and gravity to suit specific applications.
The instrument is packaged in a small, robust, stainless steel housing fully sealed against moisture penetration and
is hardwired to either vented or non-vented cable supplied by Greenspan.
The sensors are suitable for applications in harsh remote applications including groundwater, streams and rivers,
water storage bodies including stratification studies, hydrological run off studies and industrial process
monitoring.
Along with this manual, there are several other documents that may assist in the successful configuration and
operation of the Greenspan PS7000 Sensor. These should be maintained on file as a permanent reference as to
the features, applications and use of the PS7000.
Greenspan PS7000 –Specifications Brochure
Greenspan PS7000 –Certificate of Conformance
Greenspan PS7000 –Quick Start Guide

The PS7000 sensors are assembled and tested in accordance with Greenspan’s ISO 9001 Quality
Certified System. Following calibration the sensors undergo a range of additional control processes to ensure that
all specifications are consistent and documented.
The instrument is visually inspected, marked and labelled.
The complete sensor calibration record is archived for reference, and batch number information is kept
on file for statistical analysis.
An individual Certificate of Conformance is issued to the customer.
All Greenspan Sensors are made to order and are individually calibrated and inspected. This ensures that they
leave the factory in a working condition. On receipt, the customer should inspect the packaging and contents for
any signs of damage during transportation. The customer should also check that all items on the delivery note
have been received.
Please contact the factory in case anything has been damaged or missing. A full set of documentation including
Certificate of Conformance, Quick Start Guide, and User Manual will be provided with all equipment –either in
hard copy format or in electronic format on the USB shipped with the goods.
The 316 Stainless Steel, PS7000 sensor should only be used in relatively low EC situations. Stainless steel has
excellent anti-corrosion properties but care should be taken against possible corrosion in high Chloride or Ferric
solutions, water with high iron or sulphate reducing bacteria, or low dissolved oxygen. Greenspan offer a PS1000
Sensor fitted with an Acetal body which provides superior corrosion protection in a wide range of chemically
active waters.
Because an individual sensor may be used in a variety of locations, media compatibility should be checked before
installing and advice sought from Greenspan if any doubt exists.
Checking the Model Number and Range
Before installing your Greenspan PS7000 sensor check the information on the label is correct to confirm you have
received the instrument you have ordered. The label will look similar to this.
MODEL PS7000
RANGE 0 –xx m
S/N 012345
The customer is advised to keep a record of the serial numbers in case the sensor is lost or the label damage.
Greenspan keeps records of all sensors sold including a calibration history.

Greenspan warrants all new Greenspan products against defects in materials and workmanship for 12 months from
the date of invoice. Products that prove to be defective during the warranty period will be repaired or replaced at the
discretion of Greenspan.
Under Greenspan warranty conditions; it is the responsibility of the customer to cover shipping charges back to the
factory. Upon repair/replacement Greenspan will cover the return shipping charges to the customer.
This warranty does not apply to products or parts thereof which have been altered or repaired outside of the
Greenspan factory or other authorised service centre; or products damaged by improper installation or application, or
subjected to misuse, abuse neglect or accident. This warranty also excludes items such as reference electrodes and
Dissolved Oxygen membranes that may degrade during normal use.
Greenspan will not be liable for any incidental or consequential damage or expense incurred by the user due to partial
or incomplete operability of its products for any reason whatsoever or due to inaccurate information generated by its
products.
All Warranty service will be completed as soon possible. If delays are unavoidable customers will be contacted
immediately.
Any sensor should not be dismantled unless under instruction from Greenspan Technical Service staff. Incorrect
handling will void the warranty.
The correct choice of sensor and assistance with field installation can be provided by Greenspan and their sales
offices. A correct choice of equipment, together with technical advice and field experience should result in long term
success in the field. Greenspan Technical Services is dedicated to customer support and provides assistance in the
selection, installation, deployment and commissioning of sensors with a full range of consulting services. All
Greenspan products are designed, developed and manufactured in Australia and can be supplied at short notice.
If for some reason sensors are required to be returned to our factory or your sales representative, please note the
model and serial number, Describe the problem, including how and under what conditions the instrument was being
used at the time of malfunction. Clean the product and cable. Decontaminate thoroughly if used in toxic or hazardous
environment. Carefully pack product in original packaging if possible & include a statement certifying product and
cable have been decontaminated with supporting information. Products returned for repair must be accompanied by
a completed GRA (Goods Return Advice) form. All sensors returned for service and repair work must be properly
decontaminated prior to return. A cleaning charge may be applied to sensors that require further decontamination.
Service work will not commence until the quotation has been accepted by the customer. A purchase order for all
repair and service work will be required before work is carried out.

The PS7000 Pressure Sensor utilizes a ceramic-based, capacitive element as the transducer. This is designed to be of
rugged construction and incorporates active electronics as an integral part of the transducer substrate to enhance
reliability and accuracy. Force applied to the ceramic element, due to the pressure, deforms its shape. This
deformation causes a change in capacitance which can be measured by the electronics. The inherently stability and
toughness of the ceramic ensures the repeatability and long term accuracy of the readings are maintained under the
harshest field conditions.
The on board microprocessor converts the transducer output voltage to a digital signal and also measures the
transducer temperature. This information is used to temperature compensate the sensor over the range 0 - 50°C. The
result is converted to an analogue output of typically 4-20mA.
Benefits of the Ceramic Capacitance Sensors over other types of sensors are:
Extremely high overload limit (typically up to 10 X overload protection)
Absolute resistant to wear
High temperature stability
Excellent Long term stability
Excellent Repeatability and linearity
No hysteresis effects normally associated with Strain Type Sensors
Corrosion resistant –Other sensors require contact of stainless steel face
Not subject to mechanical fatigue that may affect strain gauge type sensors
Low power consumption suitable for remote monitoring & control units

When pressure sensors are used for depth readings of any fluid, the density becomes an important parameter. In
Australia a standard describes the relationship between force and water depth:
Australian Standard AS1376-1996 *
1kPa = 102.15 mm of pure water. @20degC
There is typically a 3% difference in the density between pure water and seawater. This difference should be
considered when particular measurement accuracy’s are required.
Another factor affecting calibration accuracy is gravity. The departure from standard gravity in Warwick, Qld is –
0.17%. at latitude 27.973 deg, height 458m above sea level.
The PS7000 has a feature to adjust the fluid density and gravity to suit specific applications.
*For conditions, see Clause 1.3.8.3 Australian Standard AS1376
Applications in which the Greenspan PS7000 can be used include:
Monitoring of streams and rivers.
Monitoring of water storage bodies including stratification studies.
Hydrological run off studies.
Ground and bore water analysis.
Industrial process monitoring.
The Greenspan PS7000 consists of the following primary elements:
Ceramic capacitance transducer with Acetal protective nose cone
22.5mm outer diameter
Stainless steel body material
Moulded cable entry
Power and
Data Cable
Moulded Cable Entry
22.5mm OD 316SS Body
Double O Ring connections
Ceramic capacitance
transducer Acetal
protective nose cone

All Greenspan Sensors utilise a specially designed Polyurethane Cable. The cable contains 12 x conductors, 1 x drain
wire, and an internal vent tube. The outer jacket is made from UV stabilized Polyurethane and is suitable for all
external, underwater or harsh environment applications. This common cable construction is utilized for vented and
non-vented sensors and all Greenspan Water Quality Sensors. Cables are generally factory fitted at time of
manufacture in specified lengths. Cables can be joined or repaired in the field providing a waterproof connection can
be maintained. Alternatively, cables can be terminated in waterproof junction boxes where cabling to other devices
or longer cable runs are required.
Specially Manufactured Greenspan Cable with 12 cores and Internal Vent
High chemical resilience and abrasive resistance
Conductor cross section : AWG 24,
Electrical Resistance 9 ohm per 100m (per conductor)
Operating temperature: 85°C (max.),
Bending radius (static) : 6 ,
Bending radius (dynamic) 12.
Max Operating voltage : 250V
Jacket Printing (white colour each meter)
Conductor colour codes : green, yellow, white, black, brown,
turquoise, violet, pink, red, blue, grey
Tensile Strength is sufficient to self-suspend the Greenspan Sensor to depths of 300m.
Long term creep due to temperature effects or tensile loading is negligible.
The moulded cable is fitted to the sensor using a double o ring seal and located using 2 x grub screws. The length of
the cable is not critical to the long term calibration and operation of the sensor (provided the electrical requirements
such as minimum supply voltage are maintained).
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7CVS-001 Closed Vent System
Gauge Sensors are vented to atmosphere so that the effects of changes in barometric or atmospheric pressure do
not affect water level readings. Sensors that are not vented to atmosphere are referred to as Absolute Sensors.
The primary difference between the two types of sensors is the effect of atmospheric pressure on the water level
measurements they provide.
Barometric Pressure acts on both sides of a Gauge sensor (i.e. via the water on one side and via the vent tube on
the other). The Barometric pressure is cancelled out and has no effect on the water level readings. Gauge Sensors
will read zero in air.
Barometric atmospheric pressure acts only on one side of a non-vented or Absolute Sensor (on the water side).
Any changes in Atmospheric pressure will be detected by the sensor and measured as changes in water pressure.
As the Barometric pressure varies, these changes will be measured as water level changes even though the actual
water level may have remained steady. Typical variations in Barometric Pressure when converted to head of water
are in the order of +/- 100mm. A large change in Weather Pattern (Storm Front) may cause a drop in Barometric
Pressure by up to 20Hpa which would cause an error of 200mm. Water level variations caused by Barometric
Pressure can be removed by monitoring barometric pressure (e.g. via a weather station or barometric sensor) and
then post processing the absolute water level readings.
The lowest, standard range, absolute pressure sensor offered is 20m, which is suitable for measuring water levels
of up to approximately 10m. Absolute sensors will read zero in a perfect vacuum and around 10m in air depending
on the atmospheric pressure.
Gauge sensors are suitable for most monitoring applications where water level readings are required. Absolute
sensors are suitable for applications where a vented cable is not desirable (e.g. Battery pack only sensors).
When pressure sensors are deployed, there can be a difference between the atmospheric temperature and the
temperature of the sensor at depth.
This temperature differential causes a pumping effect to occur whereby moist air
from the surface is drawn into the sensor through the vent line. This moisture
can condense on sensitive electronic components due to warm surface air
cooling inside the sensor.
Sealing the system against exposure to the atmosphere and conditioning the
existing air in the vent tube can alleviate this problem. Silica desiccant crystals
easily absorb moisture thereby drying the air and are used in the closed loop
venting system 7CVS-001.
For all gauge (vented sensors) a Closed Vent System must also be fitted
(pictured left). A single 7CVS-001 is designed to handle sensor cable lengths up
to 70 metres. Multiple units may be joined together for greater capacity.
Please refer to the Engineering Note in the appendix section on the manual for
detailed instructions on the installation of the 7CVS-001. Dimensions (including
filter): length x width x height 16cm x 7cm x 5cm.

A protective copper nose cone (Greenspan Part # 092-1037)can be fitted to the pressure transducer to inhibit
biological or marine growth on the sensor face. Similarly Greenspan also offer a sacrificial zinc anode (Greenspan
Part # 092-1031) to protect the sensor if deployed in a corrosive environment.
A ¼” G Process connector (Greenspan Part # 092-1038) can be fitted to the pressure transducer when monitoring
pressure in process applications. (Such applications may include, pipeline monitoring, gas bubblers and tanks).
The serial breakout adaptor (Greenspan Part # 085-0080) allows
connection between the PS7000 and a sensor and PC. The user is able to
communicate with the sensor in RS232 mode to perform user field
adjustments and calibration via the PS7000 Utility Software (supplied on
USB with all PS7000’s purchases).
The serial breakout adaptor can also be connected directly to a
multimeter, enabling the user to check the analogue inputs on the sensor.
The 085-0080 is supplied with a serial communications cable (Greenspan
Part # 087-0088). Please refer to the Engineering Note in the appendix
section of the manual for information.

A feature of the sensor is the ability to also provide serial output in SDI12 format using a small SDI Adapter unit
connected to the end of the sensor cable. The SDI12 Adapter unit (Greenspan Part # 7SDI-1000) provides a
standard 3 wire SDI12 output for connection to a third party Data Logger or Process Controller.
Please refer to the 7SDI-1000 User Manual for more comprehensive instructions on its use. The following
information briefly outlines the quick set-up steps for both the sensor and 7SDI-1000.
Quick Set Up
Sensor set up
Set the PS1000/7000 as a RS232 instrument
1. Connect the sensor to a PC and run the
PS7000 utility.
2. Click Sensor Set Up
3. Click RS232 radio button
4. Click OK
Provide physical connections
There is a cable available to assist connecting a bare wire sensor to the 7SDI-1000 adapter. Greenspan Part # 5CC-
770 (pictured below)
Plug the Hirschman connector into the mating connector on the 7SDI-1000
Use the screw terminals to join the bare wires from the sensor. Red to Red, Blue to Blue, Yellow to yellow and
Violet to Violet.
7SDI-1000
Set the 7SDI-1000 for the PS1000/7000

The sensor is assembled and calibrated to the required range using Ruska Digital Pressure controllers which
are externally calibrated in NATA certified laboratories.
The sensor is calibrated at multiple points over its pressure and temperature range
(typically 36 points).
oThe calibration is validated at multiple different points (typically 25 points).
oAccuracy and linearity is calculated from the validation data.
An extensive range of final calibration and inspection tests are carried out on every sensor.
The sensor is visually inspected and packed, ready for despatch.
The complete calibration records, sensor history and batch number are placed on file and archived.

The PS7000 is a 2 wire, loop powered 4-20mA output sensor with an option for 0-2.5Vdc. It is normally powered
by an 8-30V DC power supply –which can be battery, solar or Mains Plug Pack.
The following diagram illustrates the typical wiring arrangement for the PS7000 with 4-20mA output.
Closed Vent System
Part # 7CVS-001
8-30VDC (+ve Supply) red
Cable Shield yellow/green
Serial comms yellow
Serial comms purple
Serial Breakout Adaptor
(optional)
Software on USB
Signal Output 4-20mA blue
Vent
tube
Wiring for 4-20mA Output Sensor

The following diagram illustrates the typical wiring arrangement for the PS7000 with VOLTAGE output.
Closed Vent System
Part # 7CVS-001
8-30VDC (+ve Supply) red
Cable Shield yellow/green
Serial comms yellow
Serial comms purple
Serial Breakout Adaptor
(optional)
Software on USB
Signal Output 0-2.5V blue
Vent
tube
Wiring for Voltage Output Sensor
Ground (-ve Supply) green
Signal Ground brown

Data Logger or controller with SDI Input
Greenspan Analogue Sensor
Model PS7000 or PS1000
Sensor cable
with Bare Wire
connection
Bare Wire to SDI-12 Adapter cable
(included with 7SDI-1000)
(+ ve Supply) red
Ground (-ve Supply) black
Signal comms white
SDI-12 Adapter
Part # 7SDI-1000
Typically the sensor will be connected to a Data Logger or Process Controller which will provide the power and
ground connections and provide connections for serial SDI12 output.
The Power requirements of the sensor are detailed in the Specifications Brochure.

Communication with the PS7000 Sensor is performed through the PC’s RS232 serial port via the 085-0080 serial
breakout adaptor and supplied software: PS7000 Utility (PS7000 Utility is supplied free of charge on all PS7000
orders Greenspan Part # 7USB-SENSOR)
To use the full functions of the software a fully operational sensor with power supply and all communications
leads should be available.
Serial Comms Cable
Part # 087-0088
PC or laptop running PS7000
Utility program
Multimeter to check
analogue outputs
PS1000/PS70000 Breakout Adaptor
Part # 085-0080

To Load the Software, Place Software CD in drive, and open the Application (exe) file.
The main screen is divided into three sections.
The top panel consists of a drop-down-list of all available serial ports, a Connect button to connect to /
disconnect from the sensor and a Help button to access the online help. These are the only active controls at
start-up, select the port number where a sensor is connected, ensure that power supply is turned on then click
Connect to initiate communications.
The middle section contains three more buttons: Load Configuration, Save Configuration and Sensor Setup; use
these buttons to load sensor settings from a file, to save the current settings to a file or to access the sensor
configuration screens. These controls remain disabled until a connection is established. To the right of these
buttons are two text fields which display the sensor’s serial number and firmware revision, if one is connected.
There is a data panel which displays current readings for both Pressure and Temperature; but only visible when
RS232 is selected as sensor output.
A status bar at the bottom shows the current state of the interface, while the LEDs indicate activities on transmit
and receive lines.
At start-up, the only active controls are a drop-down-list of all available serial ports and the Connect button.
Select the port number where a sensor is connected, ensure that power supply to the sensor is turned on
then click Connect to initiate communications. The program will first read the sensor’s serial number, its
status and then the entire configuration data file.
All other program controls remain inactive until a connection is established. Once connected, the COM port
control will be greyed out and disabled while the ‘Connect’ button is changed to ‘Disconnect’ which can be
used to terminate the current session.
Data transfer typically takes around 10 seconds to complete. It may take longer if there are errors occurred
during data transfer; the interface will retry up to three times before reporting an error message.
In the event when the sensor’s serial number has been read but the interface fails to receive a valid
configuration due to corrupted data, the user can upload new configurations to the sensor from a file stored
on PC, provided that the file’s serial number matches up with that of the sensor.

Click Disconnect to terminate communications with the currently connected sensor.
The Sensor Setup screen allows the user to
select between analogue or serial output; it also
lets the user adjust the number of averaging
points. Click advanced button to access more
configuration items and to re-calibrate sensor.
Depending on the default factory setup, the
sensed pressure is output as 4-20mA signal or 0-
2.5V signal
The sensed pressure is output as digital data and
displayed on screen, together with current
temperature.
.
This sets the level of averaging. Lower levels of averaging will decrease response times but may also increase
the level of noise. The factory default is 120 which give a response time of approximately 1 second.