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 rerange 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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