Download CSI Formatted Specification for Druck PTX 1830 Submersible Depth

CSI Formatted Specification for GE Sensing (Druck, Inc) Model: PTX 1290
Submersible Wastewater Titanium Depth Level Sensor
PART 1 GENERAL
1.01 ARTICLE INCLUDES
A. SUMMARY
1. Products Supplied But Not Installed Under This Section
a. Depth/Level Pressure Transmitters
b. Terminal Enclosure with Desiccant
c. Lightning Arrester
2. Related Sections
a.
3. Unit Prices
a. Any unit prices offered pertain to the actual pressure sensors and related
hardware only. Prices do not include any on-site work. Refer to Division I,
Section 01025 - Measurement for specific details on pricing.
4. Refer to PART 2 of this section for product specification details
B. REFERENCES
1. FM
2. CSA
3. ASTM
4. ANSI
5. NEMA
C. SUBMITTALS
1. Detailed Pre-Installation/Installation Manuals
2. Design Test Data Supporting Performance Claims
a. Long-term Stability Data
b. Overpressure Test Data
c. Calibration Data Demonstrating Accuracy
3. Outline Drawings and Installation Drawings (if not included in Installation Manual
D. QUALITY ASSURANCE
1. Qualifications
a. ISO 9000 (Include copy of Certificate)
b. Other
2. Regulatory Requirements
a. Installation should comply with the current National Electrical Code and any
other required local codes such as City Codes, etc.
b. If Hazardous Areas as defined by FM/UL/ or CSA are present, it is essential the
hardware be certified Intrinsic Safe in accordance with the level of hazard present.
Installation should also be in accordance with these agencies. eg. FM Intrinsic
Safe, Class I, Div I, Groups A,B,C,D, including appropriate barriers.
3. Certifications
a. Factory Mutual, Class I, Div I, Groups A,B,C,D Intrinsic Safe when used with
appropriate barriers.
b. CSA, Class I, Div I, Groups A,B,C,D Intrinsic Safe when used with appropriate
barriers.
c. NEMA 6X, continuous submersion, corrosion resistant materials
F. DELIVERY, STORAGE, AND HANDLING
1. Packaging - hardware items to be packaged in such a way as to prevent
damage while in transit and suitable for short-term storage on site.
2. Special Handling Requirements - any requirements for short-term or long term
storage, with respect to the sensor and/or the cable assembly.
3. Storage/Protection Requirements - If on-site storage is to be outside,
packaging should be appropriate for rain/snow or 100% relative humidity.
G. PROJECT/SITE CONDITIONS
1. Environmental Requirements - define temperature extremes, likelihood of rain or
snow,
2. Existing Conditions - include information on existing water quality such as pH,
salinity, water temperature, any possible contaminants such as fuel oil on surface of
water, any possible explosive gases such as methane or natural gas;
3. Storage and Protection - is on-site storage available? If so, what are the conditions
(relative humidity, etc.)?
H. SEQUENCING
1. Pre-Installation Requirements
a. All drilling and well casing installation should be complete.
b. In cases where a stilling well is to be installed, this should be in place.
c. All wiring, both power and signal should be installed.
d. If a lightning arrester is to be installed, the grounding rod should be in place.
e. All pre-installation listed in the installation manual should have been completed
prior to removal of protective materials.
f. Uncoil vented cable and allow relaxation of the cable in warm (above 65F)
environment.
2. Preparations for installation should be coordinated with Division I, Section 01010 Summary of Work, (Work Sequence).
I. SCHEDULING
1. In order to prevent moisture ingress into the cable vent tube, the terminal enclosure
should be installed ready to receive the above-ground end of the cable assembly.
Before removing the desiccant protection from the cable end, the terminating end of the
cable should be installed in the terminal enclosure, with the desiccant block installed.
It is recommended that the Power/Signal cabling be attached prior to installation of the
pressure sensor, thus allowing the cover to be attached, thus providing moisture
protection when the desiccant protector is removed.
2. If a lightning arrester is to be used, the rod should be installed and the 12 AWG solid
conductor cable should be installed in the terminal enclosure prior to installing the
cable from the pressure sensor.
J. WARRANTY
1. The standard warranty should be 1 year from date of shipment. It should cover all
defects in materials and workmanship. Additional warranty time is available at time of
purchase in yearly increments up to 2 additional years at very low additional cost.
2. A 5-year Corrosion Warranty is available on the all-titanium wetted parts.
3. The cable is warranted for 1 year against defects in material and workmanship.
Note: It is the responsibility of the owner/specifier to determine the suitability of the
material for use in the application.
K. SYSTEM STARTUP
1. Pre-installation Requirements
a. The pressure transmitter should be calibrated with the data acquisition
equipment prior to delivery on site if possible.
b. In order to perform this task, it is necessary to remove the desiccant protective
cap from the terminal end of the vented cable.
c. This operation should be performed in a low humidity environment if possible,
preventing ingress of moist air into the vent tube.
d. Upon completion of the system calibration, replace the desiccant cap on the end
of the cable, ensuring that the cap is sealed with the provided tape.
e. If a pressure calibrator is not available, refer to the on-site calibration technique
described in PART 3, Article D of this Section.
2. Training of Installation and Commissioning personnel
a. It is recommended that the installation and commissioning personnel receive
some training in the proper procedures for setting up the depth/level measuring
system.
b. It is estimated that 50% of all installations are not properly set up.
c. Most manufacturers of depth/level sensing hardware can provide this training
either on-site or at their facilities.
L. MAINTENANCE
1. The only maintenance item is the desiccant module used with the Sensor Termination
Enclosure (STE, part #: 202-034-03) or equivalent desiccant box.
a. The desiccant module must be checked routinely and changed when it turns
from blue to red.
b. The time interval will depend upon the relative humidity, atmospheric pressure
changes, and other factors that cause an exchange of air within the terminal
enclosure.
c. During high humidity and rainy seasons, it should be checked frequently. If the
site is in a dry, arid environment, every 3 to 6 months should be adequate.
d. Spare desiccant modules should be kept in stock.
PART 2 PRODUCTS
2.01 ARTICLE INCLUDES
A. MANUFACTURERS
1. GE Sensing (Druck, Inc.) 1100 Technology Park Drive, Billerica, MA 01821
http://www.ge-mcs.com/en/pressure-and-level/depth-and-level.html
a. PTX 1290 Submersible Pressure Transmitter or Equivalent
B. EXISTING PRODUCTS
C. MATERIALS
1. All wetted metal parts are to be titanium with no equivalent. This material is
suitable for nearly all fluids likely to be found in submersible pressure transmitter
applications including seawater. Titanium is virtually impervious to all chemical
contaminants likely to be found in groundwater, surface water, leachate, and
wastewater.
2. The cable jacket is to be polyurethane of a particular type which is compatible with
groundwater, surface water, including seawater, leachate, wastewater, and diesel oil.
3. The diaphragm is to be a flush, PTFE-coated nitrile rubber elastometric diaphragm
D. Druck’s PTX 1290 or equivalent with the following specifications:
1. Operating pressure range - TBD
2. Overpressure - 4X FS for ranges ≤ 7 meters of water (23 feet of water)
2X FS for ranges > 7 meters of water (23 feet of water)
3. Media Compatibility - Fluids compatible with titanium, PTFE-coated nitrile rubber
and polyurethane.
4. Excitation Voltage - 9 to 28 Vdc
5. Output - 2-wire, 4-20mA
6. Combined Non-linearity, Hysteresis, and Repeatability: 0.25%FS (Optional
±0.10%FS)
7. Long term stability - 0.2%FS per year maximum
8. Zero offset and span setting – Maximum 0.1 mA
9. Operating temperature range - -20 to 60C
10. Compensated temperature range - 2 to 30C
11. Temperature effects: 1.5%FS TEB for ranges above 7 meters (23 feet) of water,
increasing prorate for ranges below 7 meters water (23 feet of water).
12. Electrical connection - vented 2/c polyurethane cable with aluminum-mylar shield,
kevlar strength member and nylon vent tube, 3 feet supplied as standard.
13. Internally potted, with molded cable
14. Insulation resistance - better than 100 MegOhms @ 500 Vdc
15. Voltage spike protection - withstand 600 V voltage spike in accordance with ENV
50142 without damage when applied between all excitation lines and case.
16. Certifications if required - FM Class I, Div I, Groups A,B,C,D Intrinsic Safe when
used with appropriate barrier. CSA Class I, Div I, Groups A,B,C,D; Certification CE Marked.; UL Class I, Div I, Groups A,B,C,D Intrinsic Safe (Optional IS Certs);
E. EQUIPMENT
1.The PTX 1290 Depth/level Transmitter is an all-titanium submersible device that
accurately measures depth or level in a well, tank, Lift Station, or body of fluid. When
equipped with an elastomeric fluid-filled isolation diaphragm, the 1290 is suitable for use
in applications where greases or biosolids may clog conventional front-end designs. Its
integral cable contains a vent tube that references the sensor to atmospheric pressure.
2. The molded polyurethane cable along with the internal potting in the transmitter, prevents
the ingress of water into the back of the transmitter. The material is impervious to water and
chemicals normally found in ground water, surface water, and wastewater.
3. The vent tube is attached to the back of the sensing element, providing a gauge reference
to atmosphere. Use of the Sensor Termination Enclosure, (STE, part #: 202-034-03) with
Desiccant is highly recommended.
F. ACCESSORIES
1. Sensor Termination Enclosure (STE, part #: 202-034-03) with Desiccant or equivalent - to
prevent moisture ingress via the vent tube or cable conductors, it is necessary to dry the air
which breathes into the tube; inclusion of a small vent which has a 35 micron PTFE filter
prevents water ingress, even during flood conditions.
a. Environmental rating – NEMA 4X rated (IP66)
b. Material - PVC base and clear, Halogen-free self-extinguishing polycarbonate cover.
c. Equipped with screw terminals as DIN rail mounted terminal blocks with screw
terminals.
d. Equipped with micro-filter which prevents ingress of water
e. Equipped with desiccant module with sight gage for determining desiccant change
intervals; Note: it is important that both the vent tube and cable end be desiccated.
f. Optional 2 inch pipe mounting kit
2. Cable Clamp – (GE Druck P/N: 192-373-01) designed to hold cable by distributing the
clamping force over an 8 inch long section of the cable jacket. The clamp may be installed
after the cable is terminated.
4. Anchor Weight and Cable Assembly for PTX-1290 – (GE Druck P/N: TAS-A157)
provides additional weight where it may be required for installation purposes.
PART 3 EXECUTION
3.01 ARTICLE
A. ACCEPTABLE INSTALLERS
1. Only experienced installation personnel should be used. As a minimum they should
have the following knowledge, equipment, and/or experience:
a. Proper calibration and set up of depth/level pressure sensors; if a pressure
calibrator is not available, the installer must know how to calibrate the level sensor
using the water level in the well.
b. Knowledge of proper grounding procedures for lightning protective devices
used in external applications.
c. Ability to read and follow manufacturer’s pre-installation and installation
instruction.
B. EXAMINATION
1. Inspect the pressure sensors, including packaging to ensure that no damage has
occurred in transit or storage.
2. Ascertain that the desiccant protective cap has not been removed from the
terminating end of the cable.
3. Ascertain that any excavating, installation of well casings, or other such equipment
use has been completed.
4. Make sure that the terminal enclosure has been mounted and is ready to receive the
terminal end of the sensor cable assembly. This includes making sure that the
power/signal cable has been installed. Note: the cable grommets/fittings should have
the cable installed prior to removing desiccant cap from the vented cable assembly.
4. Be sure that the cable assembly has been uncoiled and allowed to relax in a warm
(above 65F) environment for several days. This will allow the cable to straighten
prior to installation, reducing the likelihood of depth error during relaxation. If the
cable is installed prematurely, the lengthening of the cable will result in a depth/level
error. Note: it is a good practice to recalibrate the depth/level sensor after has been
installed for 3 to 4 days.
5. Coordinate with Division I, Section 01050 - Field Engineering
C. PREPARATION
1. Remove all trash and debris, especially sheet metal or any sharp objects on which the
vented cable might become entangles and cut. If the jacket of the cable is cut, the
assembly will leak and may damage the sensor.
2. In the case of a well, make sure that there are no burrs or sharp edges on the well
casing or stilling well. Although the polyurethane cable is tough, it is not impervious
to damage from a poorly finished site.
3. Ensure that the end of the vented cable is attached to something that will prevent it
from dropping into the well/water. It has been known to happen, necessitating
extraordinary retrieval efforts. If it does happen, the desiccant protector on the end
should prevent moisture ingress.
4. The terminal enclosure should be already installed with cables already hooked up
and, in the case of a lightning arrester, the grounding rod should already be installed.
5. In accordance with the pre-installation instructions, the length of cable, range in feet
of water at the current water temperature should have already been determined. The
use of a dip-meter is a convenient method of determining the distance to the surface of
the water and will be handy when calibrating the installed sensor.
6. Measure the temperature of the liquid being gauged in order to determine the precise
density/specific gravity. This will allow the user to compensate for thermal density
changes.
7. If a portable pressure calibrator is available, it is possible to calibrate the sensor with
the data acquisition system on-site. If one is not available, then the method described
in the installation section will suffice.
D. INSTALLATION
1. Before installing a depth/level pressure sensor, it is advisable to review certain
criteria to ensure success. Please review the following pre-installation guidelines:
2. Check to see that the proper range has been specified. Please convert your
Engineering Units relating pressure range to actual depth units that you are using. eg.
Depth in feet of H2O @ 50ºF = 10psi X 2.310436 = 23.10436 feet. In this case, a
sensor with the range of 23.1 feet should be specified. In the case of a Druck PTX
1290, you may specify the exact range.
3. Make sure that sufficient cable has been specified and provided to achieve the
required depth. Normal practice recommends that the length of cable is equal to the
depth below the measuring point that the sensor will be located plus any lengths of
cable necessary to reach the termination point. Because vented cable is relatively
expensive, a terminal box is normally located close to the well-head. This allows a less
expensive cable to be used for the distance from the well-head to the monitoring and
control instrumentation. .
4. It is necessary to calibrate and mark the cable of the submersible sensor so that a
proper reference can be established. Before installing the depth/level sensor, determine
the actual point on the sensor where the sensing diaphragm is located. Measure from
this datum when marking the cable. An accurate measurement must be made when
determining the length of cable being extended into the liquid being measured. Using a
marker or waterproof tape, mark the cable wherever desired. Normally, the first mark
should be at 1 foot. This mark will be determined by measuring from the diaphragm
datum. Accuracy is very important when placing these markers. The accuracy of the
depth measurement is critically dependent on setting the sensing element in the level
transducer at a known distance from the measuring point.
5. An alternate method using a dip-meter may be used if the pressure transmitter has
been accurately calibrated for span. Use the dip-meter to measure the distance from the
water surface to the measurement datum. After installing the pressure transmitter, take
the reading from the readout or data acquisition system. This will establish where the
transmitter is physically located in the application. Add the reading to the distance to
the surface of the water, and that is the depth from the datum that the pressure
transmitter is located.
6. If a calibrator is available, it is recommended to calibrate the sensor together with the
monitor or controller prior to installation to ensure proper setup. This will allow
accurate level to be measured from the start. If a calibrator is not available, the
calibration certificate must be used to set up the system. Note: the zero and span
figures are normally not precise, allowing for the manufacturer’s tolerances for setting.
eg. if the manufacturer specifies a zero tolerance of 1% and a span tolerance of 1%,
then the precision could be off by those amounts if not properly calibrated to the
instrument. On a 200 foot sensor, the measurement could be in error by as much as 4
feet.
7. It is recommended that a stilling well be used. In a well, the casing, or the pump
cable conduit are normally used as the stilling well. In a surface water application for
reservoir, river, canal etc. a pipe of some sort is normally used. This prevents any
turbulence or current from disturbing the depth/level pressure sensor. eg. in a river
with a 3 knot current, if a stilling well is not used, the current will cause the sensor to
physically drift downstream, causing the depth to decrease relative to the cable length.
The stilling well also protects the sensor and cable against debris from damaging the
cable. Most often, a PVC pipe is used OR with Anchor Weight and Cable Assembly
for PTX-1290 – (GE Druck P/N: TAS-A157).
8. READ THE INSTALLATION INSTRUCTIONS IN DETAIL. Note any
warnings or cautions. The most common cause of transducer failure is caused by not
heeding installation instructions.
9.In a well, in order to determine the level of the water below the measuring point, the
length of cable must be precisely set, referenced to this measurement point.
10. For example, if a sensor is ranged at 10 feet and has a 30 feet of cable below the
measuring point, and is submerged in 10 feet of water/sewage, the range between the
level and the measuring point is 20 feet. As the water level is pumped lower by 4 feet,
the new range is 14 feet.
11. In groundwater hydrology, this is a common measurement. The hydrologist tries to
determine the distance from his measuring datum and the surface of the water.
12. Since the cable with the vent tube is relatively expensive, it is normally prudent to
terminate the cable as close to the well head as possible. A cable clamp (GE Druck
P/N 192-373-01) can be used to grip the cable just above the well head. Terminate the
cable using a desiccated terminal enclosure such as the Druck Sensor Termination
Enclosure (STE, part #: 202-034-03). This enclosure has a replaceable desiccant pack
that is reusable after drying out in an oven for 3 hours.
13. In areas where lightning may be expected, it is prudent to include a lightning
arrester, making sure to wire it and the transducer shield drain wire to the same earth
ground. See the hardware section for details of the lightning arrester options.
14. Druck places a desiccant module at the end of the cable and vent tube that protects
the vent from ingress of moist air during transit and storage. Leave this in place until
actual termination in the Sensor Termination Enclosure (STE, part #: 202-034-03). If
moist air is allowed to ingress, it may condense and cause water to migrate into the
vent tube. Although this will not damage the transducer, it will block the vent tube and
prevent proper equalization of the atmospheric pressure.
E. FIELD QUALITY CONTROL
1. As a minimum, the installation should be inspected for proper wiring techniques in
accordance with local and national codes.
2. Make sure that the desiccant module is installed correctly and that the blue dot is
visible through the window in the front panel of the terminal enclosure.
3. Inspect the well-head, or stilling well to ensure that the transmitter vented cable is
clear of any possible sharp edges which might damage the cable.
4. With the transmitter installed, attached to the data acquisition system, if it is
possible, pull the transmitter up by the cable precisely 2 feet and observe the change in
reading for accuracy. Note: This may not be possible if the pressure transmitter is
attached to the stilling well.
5. If the cable cannot be raised, it may be possible to pump the level down several feet,
and by using a dip meter, determine the change in level. This is a final check of system
accuracy.
6. If a lightning arrester is employed, ensure that the drain-wire on the transducer cable
is attached to the same terminal as the 12AWG grounding wire from the lightning
arrester. Make sure that the wire size is 12AWG minimum and is connected to the
grounding rod. The resistance to earth ground must be less than 100 ohms and
preferably less than 25 ohms.
7. The cable should be secure and not allowed to flap in the wind. Many times a cable
clamp (GE Druck P/N: 192-373-01) is effective in securing the cable in place.
8. Tests and Inspection requirements should be coordinated with Division I, Section
01400 - Quality Control
F. ADJUSTING
1. After the pressure transmitter has been installed for several weeks, it is advisable to
readjust the span to allow for any possible relaxation of the cable that was in a coiled
position.
2. In the case of a well application, measuring the distance between the reference point
and the water surface using a dip-meter will allow correction of any error due to
relaxation.
3. Coordinate these requirements with Division I, Section 01700 - Contract Closeout.
G. DEMONSTRATION
1.
It is recommended that the owner/operator be shown how to determine when the
desiccant (GE Druck P/N: 410-A001) needs replacing.
2. Show the owner/operator how to replace the desiccant module.
3. Provisions of this article should be coordinated with Division I, Section 01650 Starting of Systems/Commissioning, (System Demonstrations)
END OF SECTION