Wahl CDW30 User manual

Palmer Wahl Instruments, Inc.
234 Old Weaverville Road
Asheville, NC 28804
Phone: [phone] • [phone]
Fax: [phone]
Email: [email protected]
www.palmerwahl.com
WD1118 Rev. A
June 6, 2022
CDW30
Portable Calibration Dry Well
User Manual

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Palmer Wahl Instruments, Inc. Warranty
Manufacturer warrants all products listed in this manual to be free from defects in material or
workmanship under normal use and service. The Manufacturer agrees to repair or replace any product,
which upon examination is revealed to have been defective due to faulty workmanship or material if
returned to our factory, transportation charges prepaid, within the product specific warranty period
stated in the catalog by the manufacturer. This warranty is in lieu of all other warranties, expressed or
implied and of all obligations or liabilities on its part for damages including but not limited to
consequential damages, following the use or misuse of instruments sold by the Manufacturer.
No agent is authorized to assume for manufacturer any liability except as set forth above.

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Table&of&Contents&
1. General Information ................................................................................................................................. 5
1.1. Symbol Definition ............................................................................................................................ 5
2. Safety ........................................................................................................................................................ 6
2.1. General Handling and Operating Conditions .................................................................................. 6
2.2. Staff Qualification ............................................................................................................................ 7
2.3. Personal protective equipment ....................................................................................................... 7
2.4. Specific Risks ................................................................................................................................... 7
2.5. Overheating protection ................................................................................................................... 8
3. Technical Specification and Information .................................................................................................. 8
3.1. Explanation of Symbols ................................................................................................................... 8
3.2. Approval data and certificates ........................................................................................................ 8
3.3. CDW30 Dry Well Calibrator Specifications ...................................................................................... 9
3.4. Accessories ...................................................................................................................................... 9
4. Design and function ................................................................................................................................ 10
4.1. Description .................................................................................................................................... 10
4.2. Scope of Delivery ........................................................................................................................... 10
4.3. Physical Description ...................................................................................................................... 10
4.4. Isometric views of the portable Dry Well Calibrator ..................................................................... 11
5. Transport, packaging, and storage ......................................................................................................... 15
5.1. Transport ....................................................................................................................................... 15
5.2. Packaging ...................................................................................................................................... 15
5.3. Storage .......................................................................................................................................... 15
6. Commissioning / Operation .................................................................................................................... 15
6.1. Scope of use – Calibration of temperature sensors ...................................................................... 15
6.2. Operating Position ........................................................................................................................ 15
6.3. Dry Well Inserts ............................................................................................................................. 16
6.4. Dry Well Insert Removal and Installation ...................................................................................... 16
6.5. Starting the Dry Well Calibrator .................................................................................................... 16
6.6. Viewing the current temperature and the set point temperature ............................................... 17
7. Dry Well Calibrator temperature controller operation .......................................................................... 17
7.1. Temperature controller modes of operation ................................................................................ 17

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7.2. Calibration Mode (Normal operating mode) ................................................................................ 18
7.2.1. CDW30 Series ............................................................................................................................ 18
7.3. Set Point Adjustment mode (SV) ................................................................................................... 18
8. Cooling the portable Dry Well Calibrator ............................................................................................... 19
9. Maintenance, Cleaning, and Re-Calibration ........................................................................................... 20
9.1. Maintenance ................................................................................................................................. 20
9.2. Cleaning ......................................................................................................................................... 20
9.2.1. Dry Well and insert cleaning ..................................................................................................... 20
9.2.2. Cleaning of the fan grille ........................................................................................................... 20
9.2.3. External Cleaning ...................................................................................................................... 20
9.3. Re-calibration ................................................................................................................................ 20
10. Troubleshooting ................................................................................................................................ 21
11. Dismantling, return and waste disposal ............................................................................................ 22
11.1. Dismantling ................................................................................................................................... 22
11.2. Returns .......................................................................................................................................... 22
11.3. Waste Disposal .............................................................................................................................. 22
12. Accessories for CDW30 series ........................................................................................................... 22
12.1. Additional Options ........................................................................................................................ 22

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1. 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: [phone]
[email protected]
1.1. 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.

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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.
2. 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.
2.1. 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.

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2.2. 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.
2.3. 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.
2.4. Specific Risks
WARNING!
Do not use the Dry Well Calibrator in Hazardous Locations (Flammable or Explosive
Atmospheres)!
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.

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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.
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.
2.5. 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.
3. Technical Specification and Information
3.1. Explanation of Symbols
CE, European Community
Instruments with this mark comply with applicable European directives.
3.2. 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.

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3.3. CDW30 Dry Well Calibrator Specifications
3.4. 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

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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
4. Design and function
4.1. 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.
4.2. 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
4.3. 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.

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• 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).
4.4. 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.
Dry Well
PID controller

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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
Transport Cover
Data Plate
Power Input
Module with
Power Switch

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Bottom View (internal)
CAUTION
Do not block the air inlet opening on the bottom or any of the ventilation openings on
the instrument.
4.5. Controls Description
4.5.1. Front View of PID Controller
4 3
6
8
9
1 2
Fan
5
F
a
n
Power entry
module with
power switch
7

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4.5.2. Description of the PID Controller, Operator Interface
1) P 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
a) 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.

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• 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.
5. Transport, packaging, and storage
5.1. Transport
Check if the portable Dry Well Calibrator shows any damage caused during transport. Report any
evident damages immediately to the carrier.
5.2. 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.
5.3. 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
6. Commissioning / Operation
6.1. 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.
6.2. 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.

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6.3. 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.
6.4. 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.
6.5. 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.

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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.
6.6. 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.
7. Dry Well Calibrator temperature controller operation
7.1. 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.

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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.
7.2. Calibration Mode (Normal operating mode)
7.2.1. 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.
7.3. 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.

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8. 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.
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.
Press “P”
Press up or down arrows
Press “P” to save
Press “U” for 5 seconds to
return to operating mode