WAHL CDW30 Portable Calibration Dry Well User Manual

WAHL CDW30 Portable Calibration Dry Well

CDW30 Portable Calibration Dry Well

User Manual

• WD1118 Rev. A June 6, 2022
• Palmer Wahl Instruments, Inc.
• 234 Old Weaverville Road Asheville, NC 28804
• Email: [email protected]
• Website: www.palmerwahl.com

General Information
The CDW30 Portable Calibration Dry Well is a portable unit designed for technical service, industrial, and laboratory tasks. It is manufactured by Palmer Wahl Instruments, Inc. and is used for calibrating thermometers, temperature switches, thermostats, resistive and thermocouple temperature sensors.

Symbol Definition

• DANGER: Indicates an immediately dangerous situation which causes death or serious injury if not avoided.
• WARNING: Indicates a potentially dangerous situation which may cause death or serious injury if not avoided.
• CAUTION: Indicates a potentially dangerous situation which may cause death or minor or medium injury or material or environmental damage if not avoided.
• INFORMATION: Marks useful tips and recommendations as well as information for efficient and fault-free use.

Safety

• DANGER: Indicates hazards caused by electric current. There is a risk of serious or deadly injuries if safety instructions are not observed.
• WARNING: Indicates a possibly dangerous situation which may cause burns due to hot surfaces or liquids if not avoided.
• WARNING: Before installation, commissioning, and operation, make sure you have selected the appropriate dry well calibrator with respect to the measuring range, version, and specific measurement conditions. Risk of serious injury and/or property damage if not avoided.
• ATTENTION: Indicates additional important safety and operating instructions.

Temperature Controller Operation
The Dry Well Calibrator features a temperature controller with different modes of operation. The calibration mode (normal operating mode) is used for calibrating thermometers and other temperature sensors. The set point adjustment mode allows you to adjust the desired temperature set point.

Cooling the Portable Dry Well Calibrator
The portable Dry Well Calibrator can be cooled using the appropriate cooling mechanism. Refer to the user manual for specific instructions on cooling the calibrator.

Maintenance, Cleaning, and Re-Calibration
Regular maintenance, cleaning, and re-calibration of the Dry Well Calibrator is important to ensure accurate and reliable temperature calibration. Follow the guidelines provided in the user manual for proper maintenance and cleaning procedures. If re-calibration is required, refer to the user manual for detailed instructions.

General Information

• Model CDW30x-E is identical to CDW30x with exception to the power cord provided. All information and references to CDW30x pertain to CDW30x-E.
• This instruction manual provides important information about the instrument operation. In order to work with this instrument safely it is essential to comply with all safety and handling instructions provided.
• Always comply with the regulations on accident prevention and safety rules in force at the place of use of the instrument.
• The instruction manual is an integral part of the instrument and must be near the equipment, so that technicians and end-users can refer to it at any time.
• The qualified staff must have read and understood the instruction manual before use.
• The manufacturer is discharged from any liability for damages caused by usage not according to the intended purpose, non-observance of this manual, handling by non-qualified personnel as well as unauthorized modification of the instrument.
• General conditions of sale included in the sales documentation apply.
• Technical modifications are reserved without notice.

For more information refer to

• Website : www.palmerwahl.com
• Relevant Technical Sheet : CDW30
• Technical Service: 800-421-2853
• [email protected]

Symbol Definition

**| DANGER**

Indicates an immediately dangerous situation which causes death or serious injury if not avoided.

---|---
**| WARNING**

Indicates a potentially dangerous situation which may cause death or serious injury if not avoided.

**| CAUTION**

Indicates a potentially dangerous situation which may cause death or minor or medium injury or material or environmental damage if not avoided.

**| INFORMATION**

Marks useful tips and recommendations as well as information for efficient and fault- free use.

**| DANGER**

Indicates hazards caused by electric current. There is a risk of serious or deadly injuries if safety instructions are not observed.

---|---

| WARNING!

Indicates a possibly dangerous situation which may cause burns due to hot surfaces or liquids if not avoided.

Safety

**| WARNING!**

Before installation commissioning and operation make sure you have selected the appropriate dry well calibrator with respect to measuring range, version and specific measurement conditions. Risk of serious injury and / or property damage if not avoided.

---|---
**| ATTENTION!**

Indicates additional important safety and operating instructions.

General Handling and Operating Conditions

• The Dry Well Calibrator is a portable unit for technical service, industrial and laboratory tasks. Palmer Wahl Instruments, Inc.’s Dry Well Calibrators are provided for calibrating thermometers, temperature switches, thermostats, resistive and thermocouple temperature sensors.
• This product has been designed and built only for the purpose described herein and should be used in accordance to it.
• Operate in accordance with the technical specifications of this manual. Any inappropriate handling or use of the equipment not in accordance with the technical specifications requires the immediate service and verification by an authorized Palmer Wahl Instruments, Inc. technician.
• Handle this electronic precision instrument with due diligence, protecting against humidity, strong impacts, magnetic fields, static electricity, and extreme temperatures. Do not introduce any objects into the ventilation openings of the instrument. Connector pins must be protected against contamination.
• If the instrument is moved from a cold to a warm environment, a malfunction due to condensation can occur. In this case you must wait until the temperature of the instrument equilibrates to the room temperature before putting it back into operation.
• Palmer Wahl is not responsible for any damages caused by inappropriate handling or misuse of this equipment.

Staff Qualification

WARNING! – Risk of injury due to insufficient staff qualification!
Improper handling and use may cause considerable personal and property damage. The activities described in this manual should be performed only by qualified personnel with the appropriate qualifications.

Qualified Personnel
Because of their professional training and their knowledge of control and measurement technologies, as well as their experience and knowledge of regulations, standards and guidelines in the country of use, qualified personnel are able to perform the works described and recognize potential dangers by themselves.

Personal protective equipment
The personal protective equipment protects qualified personnel from hazards which may harm their health and safety during work. Operators must wear personal protective equipment during the operation and use of this instrument.
Comply with the specific requirements for personal protective equipment in the work area!
The owner must provide personal protective equipment. In addition to eye protection, lab coats and work gloves are recommended.

| WEARING PROTECTIVE GLASSES!

Safety glasses or goggles protect the eyes from projected parts and splashes.

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Specific Risks

**| WARNING!**

Do not use the Dry Well Calibrator in Hazardous Locations (Flammable or Explosive Atmospheres)!

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| DANGER!

Risk of death, by electric current. There is direct danger of death from touching live parts.

• The installation and assembly of electric products must only be performed by a qualified electrician.
• Before replacing any fuses, cleaning or maintenance, disconnect the calibrator from the AC Mains by removing the power cord from the electrical outlet.

**| WARNING!**

If a malfunction of the Dry Well Calibrator can cause personal injury or property damage, it may be necessary to install additional electromechanical protection devices.

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**| WARNING!**

The Dry Well Calibrator is designed to be used for temperature calibration. Use for any other application may require further protective measures, and is performed at the user’s risk.

Overheating protection

**| WARNING!**

For your safety the Dry Well Calibrator is equipped with an independent over- temperature protection device that disconnects the power supply from the heating elements in the event of excessive temperature inside the housing. After cooling, the

dry well calibrator must be returned to Palmer Wahl Instruments, Inc. for servicing.

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Technical Specification and Information

Explanation of Symbols

CE, European Community
Instruments with this mark comply with applicable European directives.

Approval data and certificates

Approval and certificates, CDW Series CE compliance

Low Voltage Directive| 2004/108 CE, EN 61326 Emission (Group 1, Class B) and resistance to interferences (industrial locations).
Low Voltage Directive| 2006/95 / EC, EN 61010-1, safety regulation for electrical measuring, control, regulation and laboratory instruments.
Certificate of Conformance| Our Certificate of Conformance is a statement that our product meets published specifications, included on the packing list with every product. Optional “Long Form” Certificate of Conformance is available upon request, confirming PO number, items shipped, and serial numbers for all products included in the shipment.

CDW30 Dry Well Calibrator Specifications

Accessories

• 12457-03 – Trolley transport case for CBB30/CLB50/CDW30, high density foam, wheels and handle Additional Inserts
• 12457-21 : Insert J: 2 each: 1/8 inch; 1/4 inch; 3/8 inch Diameter Holes (Replacement)
• 12457-22 : Insert K: 6 each: 1/4 inch Diameter Holes
• 12457-23 : Insert L: 1 each: 1/16 inch; 1/8 inch; 3/16 inch; 1/4 inch; 3/8 inch Diameter Holes
• 12457-24 : Insert M: 1 each: 1/8 inch; 3/16 inch; 1/4 inch; 3/8 inch Diameter Holes 12457-25: Insert E: Blank, No Holes, (user drill)
• Note : 12457-21 is included as standard

Design and function

Description
The Palmer Wahl portable Dry Well Calibrator is designed for use on the factory floor or in the calibration laboratory and is provided for calibrating thermometers, temperature switches / thermostats, and RTD, thermistor and thermocouple sensors and probes. The operational safety of the equipment is only guaranteed when used as planned (calibration of temperature sensors). The temperature limit values specified should not be exceeded under any circumstances (see Chapter 3 “Technical Specifications and Information “). The corresponding equipment, such as reference thermometer or reference probe, must be selected, tested and validated according to the application. Routine maintenance is recommended.

Scope of Delivery
The portable Dry Well Calibrator is shipped in specially designed packaging, which should be retained for future shipping, in the event the calibrator needs to be returned to the manufacturer for repair or recalibration.
Standard supply list for model CDW30

• Dry Well Calibrator
• Standard Insert “J”
• Insert Removal Tool
• Power cord (1.5m) (North American plug is standard, European plug on “-E” models)
• Certificate of Conformance
• User Manual (available online at palmerwahl.com/downloads)

Inspect contents to the packing list to make sure all parts have been delivered.

WARNING!
Use only the supplied power cable

Physical Description

• The portable Dry Well Calibrator is housed in a sturdy steel enclosure with a painted exterior and is provided with a carrying handle.
• The back section of the housing contains the thermally insulated dry well with interchangeable inserts. The well opening is located on top, behind the handle.
• The front section of the housing contains the temperature controller for adjusting the target temperature and displaying the current dry well temperature.
• The portable Dry Well Calibrator includes heating and cooling circuits for realization of the target temperature. Heating and cooling are controlled via Solid State Relays.
• The temperature controller is equipped with a 7-segment LED Display consisting of two 4-digit displays to indicate the Process Value (PV – upper) and the Set Value (SV – lower).

Isometric views of the portable Dry Well Calibrator
Located at the top, just behind the handle is the dry well opening with interchangeable inserts. (See 6.3 for instructions on how to install inserts.)
The PID temperature controller is located on the front of the calibrator.

Rear view
The rear panel of the calibrator contains the following

• Power Input Module with Power ON/OFF switch, for connection to the AC Mains supply;
• Data Plate with Model Number, Serial Number, Temperature Range, Power requirements, and Fuse requirements

Bottom View (internal)

CAUTION
Do not block the air inlet opening on the bottom or any of the ventilation openings on the instrument.

Controls Description

Front View of PID Controller

Description of the PID Controller, Operator Interface

1. Key
   • Access to the defined nominal temperature.
   • Access to menu items and parameters.
   • Confirmation of change.
2. ˅ Key (Down Key)
   • Reduction of the adjustable values.
   • Selection of each menu item.
   • Move back 1 level in the menu.
3. ^ Key (Up Key)
   • Increase of the adjustable values.
   • Selection of each menu item.
4. U Key
   • Allows selection of saved Set Points.
5. LED Out 1
   • Indicates the status of the output for temperature regulation.
   • LED OUT 1 “ON” indicates the dry well calibrator’s heater is ON.
   • LED OUT 1 “OFF” indicates the dry well calibrator’s heater is OFF.
6. LED Out 2
   • CDW30 – Heating and Cooling
   • Indicates the status of the output for temperature regulation.
   • LED OUT 2 “ON” indicates the dry well calibrator’s cooler is ON.
   • LED OUT 2 “OFF” indicates the dry well calibrator’s cooler is OFF.
7. PV Indicator
   • Indicates the current dry well temperature as measured by the internal temperature sensor.
   • In Program or Menu mode displays the modes and parameters menu items.
8. SV Indicator
   • Indicates the Set Value of the temperature controller.
   • In Program or Menu mode displays current settings for the selected mode or parameter indicated in the PV indicator.
9. LED SET
   • When flashing, indicates controller is in Program or Menu mode.

Transport, packaging, and storage

Transport
Check if the portable Dry Well Calibrator shows any damage caused during transport. Report any evident damages immediately to the carrier.

Packaging
Do not remove the packaging until the unit is ready to be installed. Keep the packaging for future use, in the event that the installation site changes or if the product is shipped for service or calibration.

Storage
Permissible conditions for storage

• Storage temperature : – 10 … +60 °C / 14 … 140°F
• Humidity : 30….95% relative humidity (non-condensing)

Avoid the following

• Direct sunlight or proximity to hot objects
• Mechanical vibration, mechanical shock
• Soot, steam, dust and corrosive gases
• Potentially explosive environment, flammable atmospheres

Commissioning / Operation

Scope of use – Calibration of temperature sensors
Calibration of temperature sensors is accomplished by placing a Standard Instrument (Reference Device) into the Dry Well at the same depth as the Device Under Test (DUT). By comparing the temperature indicated on the Standard Instrument with the DUT, you can determine the calibration accuracy of the DUT sensor. If the accuracy requirements permit, the local display on the Dry Well may be used as the Standard Instrument.

WARNING
Grounded Thermocouples may display erroneous measurements due to ground loops. Grounded thermocouple measurements must be validated to determine if erroneous measurements from ground loops are present.

Operating Position
The portable Dry Well Calibrator must be operated in a vertical position and should never be used in the horizontal position as temperature uniformity may be adversely affected.

Dry Well Inserts
To achieve maximum accuracy of a dry well calibrator, use the appropriate insert for the probes being calibrated. Due to the specific features of the different calibration inserts, different calibration results may be obtained. If extreme accuracy is required, a compensation of the calibration inserts should be performed. Consult the manufacturer for more information. Available calibration inserts are

• 12457-21 : Insert J: 2 each: 1/8 inch; 1/4 inch; 3/8 inch Diameter Holes (included as standard) 12457-22: Insert K: 6 each: 1/4 inch Diameter Holes
• 12457-23 : Insert L: 1 each: 1/16 inch; 1/8 inch; 3/16 inch; 1/4 inch; 3/8 inch Diameter Holes 12457-24: Insert M: 1 each: 1/8 inch; 3/16 inch; 1/4 inch; 3/8 inch Diameter Holes
• 12457-25 : Insert E: Blank, No Holes, (user drill)

Note: Metric and other fractional sizes may be available upon request.

Dry Well Insert Removal and Installation

WARNING!
Do Not remove inserts unless their temperature is at or near room ambient temperature. Hot inserts may seriously burn the operator or unprotected surfaces.

Remove the insert by inserting the tool ends into the internal holes in the side of two of the inserts cavities and pulling straight up.
Insert the new insert making sure the end with holes is facing upward. Gently press it into place so that it is fully seated into the dry well cavity.

Starting the Dry Well Calibrator

• Connect the provided power cord to the power input module located on the rear of the instrument. Connect the power cord to the AC Mains supply.
• Set the Power On/Off switch to the ON position. The Power On/Off switch is located on the Power Input Module on the rear panel. The Controller will turn on and the top PV display will show the word “TEST”. On the lower SV display the version number is momentarily displayed, for example “Rl 2.7”.
• After about 5 seconds, activation will be completed and the normal operating mode is automatically displayed. The controller will then regulate the calibrator’s temperature to match the selected Set Value displayed on the temperature controller.

CAUTION!
If the Dry Well Calibrator is not used for a long period, it is possible that moisture penetrates into the heating elements due to the materials used (magnesium oxide). After transportation or storage of the calibrator in humid environments, the heating elements must be preheated slowly. During the drying process it is assumed that the calibrator has not yet reached the required electrical isolation voltage for the stated protection class.

Viewing the current temperature and the set point temperature

Upper Display – PV – Process Value
The 4-digit red seven segment display shows the current temperature of the Dry Well Calibrator.

Lower Display – SV – Set Value
The 4-digit green seven segment display shows the Set Point temperature of the Dry Well Calibrator. After reaching the set point temperature, the PID controller will maintain a stable temperature in the Dry Well by delivering short pulses of heating or cooling energy to it.

LED Indicators
The red LED OUT 1 indicates the heating status. During the heating phase a constant LED OUT 1 “ON” indicates the continuous input of heat energy. A flashing LED means that the Set Point temperature will be reached soon or has been reached and the controller is cycling power to the heater by delivering short pulses of energy, in order to maintain stability.
The red LED OUT 2 indicates cooling status. A constant LED OUT 2 “ON” indicates the continuous input of cooling energy. A flashing LED means that the Set Point temperature will be reached soon or has been reached and the controller is cycling power to the cooler by delivering short pulses of energy, in order to maintain stability.
To ensure proper temperature stability the cycle time of the controller is set to a low level and the control output is activated with high frequency.

Dry Well Calibrator temperature controller operation

Temperature controller modes of operation

• Calibration mode : Normal operating mode. The calibrator will heat or cool until the set point temperature is reached and then maintain it at the set temperature. When the temperature stabilizes it will be ready for use.
• Set Point Adjustment mode : This mode allows editing of the set point temperature.
• Main menu : Allows entry into the main menu for editing the control parameters and includes calibration parameters for the Dry Well Calibrator as described in 9.3. See controller user manual for details.

Calibration Mode (Normal operating mode)

CDW30 Series
The CDW30 series provides above and below ambient temperature control. Once the set point is set via the up/down arrows or from the programmed list, the controller will ramp the calibrator temperature to the selected temperature and then control it for stability. In this mode the LED indicators are as follows

• LED 1 indicates when the heater is on.
• Solid “ON” means heat is being applied continuously, which occurs when the PV (process value or dry well temperature) is well below the SV (set value).
• Flashing “ON” means heat is being pulsed for regulating the temperature, which occurs when the PV is close to or at the SV.
• “OFF” means no heat is applied.
• LED 2 indicates when active cooling is applied.
• Solid “ON” means active cooling is being applied continuously, which occurs when the PV (process value or dry well temperature) is well above the SV (set value).
• Flashing “ON” means active cooling is being pulsed for regulating the temperature, which occurs when the PV is close to or at the SV.
• “OFF” means no active cooling is applied.

Set Point Adjustment mode (SV) To set a temporary set point
Briefly press the “P” Key. The upper display will show the process value and the lower display will show the current set value.

• Press the “Up Arrow” to increase or the “Down Arrow” to decrease the set  value.
• Briefly press the “P” Key to confirm the new value as the new set value.
• Wait 10 seconds or press and hold the “U” key for 5 seconds and the meter will return to normal operating mode.

Press and release “P” and the current Set Point will show.
Using the up and down arrows, scroll to the desired new set point value. In this example, 40.0° is used. Press P to confirm and save.
Press U for 5 seconds or wait for 10 seconds with no keys pressed and the meter will return to normal operation.

Cooling the portable Dry Well Calibrator

WARNING! – RISK OF BURNS
Before transporting or touching the portable Dry Well Calibrator it is necessary to ensure that it is sufficiently cooled, otherwise there is a risk of burns to the operator and possible damage to the portable Dry Well Calibrator. To bring the calibrator from a high temperature to a low temperature as quickly as possible, the set point temperature must be set to a temperature lower than or near ambient temperature.

ATTENTION!
If AC Power is removed from the unit, neither the active cooling nor the fan will operate, which will slow the cooling significantly. However, there is sufficient insulation to ensure no damage to the Dry Well Calibrator or its surroundings will occur.

Maintenance, Cleaning, and Re-Calibration

Maintenance

ATTENTION!
To increase the life of the equipment, set the calibrator to a set point of near 25° (77°F) and allow it to reach that temperature before powering the unit Off.

The equipment described here requires minimal maintenance. All repairs must be performed only by the manufacturer. Changing the fuse is excluded. Before changing the fuse, disconnect the power to the portable Dry Well calibrator by removing the power cord from the electrical outlet and the power input module.

Cleaning

ATTENTION!

• Cool the Dry Well Calibrator before cleaning.
• Power off and disconnect the power cord from the AC Mains supply.
• Clean the calibrator with a damp cloth.
• Ensure that the electrical connections do not get wet.

ATTENTION!
See section 11.2 “Returns” for more information about the return of the instrument.

Dry Well and insert cleaning
Keep the internal well of the Calibrator and the internal bores of the inserts clean and free from debris. Distilled water, compressed air or a dry cloth may be used. Always follow safety protocols and wear safety glasses or shield when using compressed air.

Cleaning of the fan grille
The Dry Well Calibrator has a fine mesh filter over the fan to minimize dust and debris from entering the housing. Clean the grill regularly as the usage and environment requires.

External Cleaning
Clean the outside of the Dry Well Calibrator with a damp cloth and a mild solvent-free detergent.

Re-calibration
The portable Dry Well Calibrator has been adjusted and tested before shipment using standard internationally recognized quality measurement instruments.
If adjustment is needed, you may return the Dry Well Calibrator to Palmer Wahl Instruments, Inc. Contact by following the instructions in paragraph 11.2, “Returns”.

If you prefer to calibrate it yourself and have the appropriate equipment, the temperature controller has Low and High temperature offsets available for calibration of the internal temperature sensor, which drives the PV display. Section 7.3 of this manual shows the controllers registers for A.L.P, the low temperature calibration point, A.L.o, the low temperature point offset (or correction); A.H.P, the high temperature calibration point and A.H.o, the high temperature point offset (or correction).
For a complete example, you can download the user manual from the Ascon Technologic website at the following link. Manuals are at the bottom of the page.
https://www.ascontecnologic.com/en/industrial-automation/advanced-programmer- controllers/k-series/k39

Troubleshooting

instrument to the manufacturer for repair
Displays “uuu”| Under range indication – Reference sensor is below range| Increase the temperature or return the instrument to the manufacturer for repair
Displays “ooo”| Over range indication – Reference sensor is open or over range| Decrease the temperature or return the instrument to the manufacturer for repair
Displays “EREP”| Possible failure in the EEPROM memory of the controller| Press the “P” key. Power off unit and restart
Fan does not work| Fan is blocked or defective| Clear any obstructions. Return the instrument to the manufacturer for repair
PV does not reach SV| The solid state relay is defective or the heating/cooling elements are defective| Return the instrument to the manufacturer for repair
No Display| The controller is defective| Return the instrument to the manufacturer for repair
No Functionality at all| AC power not connected Fuse blown| Check power connections and check the fuse

ATTENTION!
If the defect cannot be corrected by the actions detailed above the instrument must be put out of service immediately and prevented from erroneous powering up. In this case you must consult the manufacturer. If you wish to return the instrument please see section 11.2 Returns.

Dismantling, return and waste disposal

Dismantling

WARNING!
Risk of burns! Cool the product sufficiently before dismantling!

To avoid damage

• Cool the instrument as described in Section 8, “Cooling the Dry Well Calibrator”.
• Turn off the portable Dry Well Calibrator and remove the plug from the wall outlet and the power input module of the Dry Well Calibrator.

Returns
For product returns for calibration please go to PalmerWahl.com and click on Request an RMA (near top of page) and fill out the form to receive an RMA number and instructions to return your product. Contact Customer Service at 1-800-421-2853 with any questions.

To avoid damages

• Use the original packaging whenever possible. Place the product in the center with the packing material evenly distributed around all sides.
• Apply a label indicating that it is a shipment of a highly sensitive measuring instrument.

Waste Disposal
Improper disposal may cause damage to the environment. Dispose of the components of the product and packaging materials in accordance with the regulations relating to waste treatment and disposal of the country of use, along with all local disposal regulations.

Instruments with this label warn that they must not be disposed of in household waste. For removal they must be returned to the manufacturer or delivered to the local community waste disposal agency or recycler.

Accessories for CDW30 series

Additional Options

• 12457-03 – Trolley transport case for CLB30/CLB50/CDW30, high density foam, wheels and handle Additional Inserts
• 12457-21 : Insert J: 2 each: 1/8 inch; 1/4 inch; 3/8 inch Diameter Holes (Replacement)
• 12457-22 : Insert K: 6 each: 1/4 inch Diameter Holes
• 12457-23 : Insert L: 1 each: 1/16 inch; 1/8 inch; 3/16 inch; 1/4 inch; 3/8 inch Diameter Holes
• 12457-24 : Insert M: 1 each: 1/8 inch; 3/16 inch; 1/4 inch; 3/8 inch Diameter Holes 12457-25: Insert E: Blank, No Holes, (user drill)
• Note : 12457-21 is included as standard

Palmer Wahl Instruments, Inc.

• 234 Old Weaverville Road
• Asheville, NC 28804
• Phone : 800-421-2853
• 828-658-3131 FAX: 828-658-0728
• Email : [email protected]
• www.palmerwahl.com

References

• Palmer Wahl Temperature and Pressure Product Manufacturing
• Palmer Wahl Temperature and Pressure Product Manufacturing

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