VWR VWRC0386A Instruction Manual Download Page 10

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Chest Freezer

2-1

VWR International

Section 2

Overview

Figures 2-1 and 2-2 show the front view of the freezer and indicate the
following freezer components:

• Control Panel - keypad, displays and indicators.

• BUS (Optional Back Up System) panel.

• Optional temperature recorder (7 day, one pen) or datalogger.

• Keylock - keyed lid lock.

Figure 2-1.

Front View - 3 cu ft (85 liters)

Figure 2-2.

Front View - 13 and 20 cu ft (368 and 566 liters)

Summary of Contents for VWRC0386A

Page 1: ...ft Size liters Box Voltage 86 C FREEZERS 10160 738 VWRC0386A 3 85 63 120V 60Hz 471 1137 VWRC0386V 3 85 63 230 50Hz 10160 740 VWRC1386A 13 368 252 120V 60Hz 10160 742 VWRC1386D 13 368 252 208 230V 60Hz 471 1138 VWRC1386V 13 368 252 230 50Hz 10160 744 VWRC2086A 20 566 396 120V 60Hz 10160 746 VWRC2086D 20 566 396 208 230V 60Hz 471 1139 VWRC2086V 20 566 396 230 50Hz ...

Page 2: ... A redundant temperature sensing device has been included in this ULT freezer This device is a type T thermocouple For convenient access the thermocouple Figure 2 3 terminates in an interconnect jack Figure 2 5 behind the base front cover May be located differently in chests See Section 2 It is strongly recommended that this thermocou ple be attached to a redundant 24 hour 7 day monitoring system ...

Page 3: ... event shall VWR be held liable for any damages direct or incidental arising out of or related to the use of this manual Intended Use These chest freezers see cover page for specific model series described in this manual are high performance units for professional use These products are intended for use as cold storage in research use and as a general purpose laboratory freezer storing samples or ...

Page 4: ... by handling it over to an authorized facility for separate collection and recycling It s also your responsibility to decontaminate the equipment in case of biological chemical and or radiological contamination so as to protect from health hazards the persons involved in the disposal and recycling of the equipment For more information about where you can drop off your waste of equipment please con...

Page 5: ...ce contact your local VWR representative or visit vwr com VWR can supply technical information about proper setup operation or troubleshooting of your equipment We can fill your needs for replacement parts or provide you with on site service We can also provide you with a quotation on our Extended Maintenance Program for your products Whatever VWR products you need or use we will be happy to discu...

Page 6: ...ure 2 12 Set High Temperature Alarm 2 13 Set Low Temperature Alarm 2 13 Access Code 2 14 Run Mode 2 14 Calibrate 3 1 Calibrate Control Probe 3 1 Temperature Stabilization Periods 3 1 Configuration 4 1 Configuration Mode 4 1 High Alarm Test 4 1 Low Alarm Test 4 1 System Battery Test 4 2 BUS Battery Test 4 2 Display Temperature 4 3 Clear High Stage Alarm 4 3 Set Access Code 4 3 RS485 Address 4 4 Bac...

Page 7: ...ctory Installed Options 7 1 Back Up System BUS 7 1 Install Injection Assembly 7 1 Install Temperature Probe 7 2 Connect Probe Solenoid Harness 7 4 BUS Control Panel 7 4 Configure Optional BUS Back Up System 7 7 Set Optional BUS Set Point 7 7 Test the BUS Operation 7 8 Disconnect Fitting Assembly Transfer Hose 7 8 Chart Recorder 7 8 Install Chart Paper 7 9 Change Program 7 9 Calibrate Chart Recorde...

Page 8: ... FLA Breaker Requirements 15 Amp Dedicated Circuit 15 Amp Time Delay Breaker 15 Amp Dedicated Circuit 15 Amp Time Delay Breaker 20 Amp Dedicated Circuit 20 Amp Time Delay Breaker Temperature Range 50 C 58 F to 86 C 123 F in an 18 C to 28 C 64 4 F to 82 4 F ambient Capacity 3 0 cu ft 84 9 liters Refrigeration Cascade system 2 hermetically sealed compressors Insulation CFC free foamed in place ureth...

Page 9: ...ed for import into the EU the following sizes are designed for use with the following amounts of fluorinated greenhouse gases 1 Installation category overvoltage category defines the level of transient overvoltage which the instrument is designed to withstand safely It depends on the nature of the electricity supply and its overvoltage protection means For example in CAT II which is the category u...

Page 10: ...ezer and indicate the following freezer components Control Panel keypad displays and indicators BUS Optional Back Up System panel Optional temperature recorder 7 day one pen or datalogger Keylock keyed lid lock Figure 2 1 Front View 3 cu ft 85 liters Figure 2 2 Front View 13 and 20 cu ft 368 and 566 liters ...

Page 11: ...for probe and solenoid RS 232 or RS 485 interface Power Switch mains disconnect Optional BUS battery I O Optional BUS Connections Remote Alarm Contacts Power Switch mains disconnect Power Inlet Threaded holes for wall bumpers Access Port Figure 2 3 Rear View 3 cu ft 85 liters RS 232 or RS 485 Interface Remote Alarm Contacts and Analog Output Optional BUS Connections Power Switch mains disconnect P...

Page 12: ...y power switch freezer and BUS Thermocouple receptacle Battery mounting bracket Freezer and optional BUS battery T Figure 2 5 Probe Cover aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa aaaaaaa C F RH Alarm Sensor To remove filter Thermocouple interconnect jack O Battery Switch Condenser Figure 2 6 13 and 20 cu...

Page 13: ...s port Figure 2 7 Freezer Left Side Sidecar panel removed O aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa aaaaaaaa O System battery Battery switch Thermocouple interconnect jack To remove filter Figure 2 8 3 cu ft 85 liters Models ...

Page 14: ... condenser condition 7 Message Center displays system status and alarms 8 Scroll for Parameters arrows moves the operator through the choices of the selected mode 9 Up and down arrows Increases or decreases values toggles between choices 10 Enter arrow Stores the value into computer memory Chest Freezer 2 5 VWR International Section 2 Overview Figure 2 9 Control Panel Keys Display and Indicators C...

Page 15: ...ctions under each of the modes 2 6 Chest Freezer VWR International Section 2 Overview Table 2 1 Modes of Operation Run Settings Calibrate Configuration Default Mode System Ok Control Set Point Control Probe High Alarm Test Line Voltage High Alarm Set Point Optional Sample Probe Low Alarm Test Compensated Voltage Low Alarm Set Point System Battery Test HSHX Temperature Optional Back Up System Set P...

Page 16: ...ius The message center displays the system status Mode at all times The message SYSTEM OK displays during normal operation Alarm messages are displayed if the system detects an alarm condition See Section 5 Alarms To remove the freezer from the pallet use a 1 2 wrench to remove all the bolts securing the shipping bracket to the pallet Note If tipped more than 45 allow the unit to set upright for 2...

Page 17: ... clearance of 8 on the side of the freezer is required Allow adequate space for lid opening If ambient increases above 36 C clearance at the rear of the cabinet must be increased to 8 s The parts bag located inside the cabinet contains the following parts Install the bolts into the pre tapped holes on the back of the compressor section Install a neoprene cap on each bolt Refer to Figure 2 2 for th...

Page 18: ...e control probe is out of range error the numerical temperature data XXX in the transmission would be replaced by T_ERR If no alarm condition exists spaces will be sent A total of 20 characters will be sent SP Space LF Line feed CR Carriage return EOT End of text 4 NUL Null character 00 If an alarm condition does exist Error Message in the protocol will be replaced by the following UNDERTEMP tempe...

Page 19: ...trip on high stage control probe and micro board failures Figure 2 12 shows the remote contacts in alarm state The analog output function allows the freezer to output signals representing the temperature of the freezer cabinet The factory default setting is 4 20 mA Refer to Table 2 2 for output specifications 2 10 Chest Freezer VWR International Section 2 Overview Remote Alarm Contacts and Analog ...

Page 20: ...t and compare it with the outlet voltage Then with the power switch turned off plug the line cord into the wall outlet First turn on the freezer power switch Then open the lower front door by grasping the bottom left corner Locate the battery switch Figure 1 4 and turn it to Standby mode During initial freezer start up the system battery may require charging and the Low Battery message may appear ...

Page 21: ...is not connected and flowing on unit start up Refer to Section 6 s The freezer has an operating temperature range of 50 C to 86 C depending on ambient temperature The freezer is shipped from the factory with a temperature set point of 80 C To change the operating temperature set point 1 Press the Mode key until the Settings indicator lights 2 Press the right arrow until SET PT XX is displayed in t...

Page 22: ...tial start up the high temperature alarm is disabled until the cabinet reaches set point or 12 hours elapse s The low temperature alarm activates an audible visual warning when the freezer chamber temp reaches or decreases below low temp alarm set point To set the low temperature alarm set point 1 Press the Mode key until the Settings indicator lights 2 Press right arrow until LO ALM XX displays i...

Page 23: ...ault mode for the freezer The run mode displays the cabinet temperature on the temperature display and SYSTEM OK on the message center under normal operating conditions In addition the Run mode allows display of the following information LINE VOLTAGE COMPENSATED VOLTAGE HSHX TEMPERATURE heat exchange temperature This information is scrolled individually by pressing the right arrow key In each case...

Page 24: ...return to previous parameter Press to return to previous parameter Low Alarm Set Point High Alarm Set Point Control Set Point To Set Settings Mode Mode Press to return to previous parameter Optional Back Up System Set Point LO ALM XX BACKUP XX Numbers increase Numbers decrease Press Enter arrow to save setting Numbers increase Numbers decrease Press Enter arrow to save setting Numbers increase Num...

Page 25: ...perature of the measuring device See Chart 3 1 at the end of this section for more detail 1 Press the Mode key until the Calibrate indicator lights 2 Press the right arrow until CONT T XX X appears in the message center 3 Press up down arrow to match the display to calibrated instrument 4 Press Enter to store calibration 5 Press the Mode key to return to Run or the right left arrow to go to next p...

Page 26: ...T T XX X Press MODE to move to CONFIGURATION mode Mode SAMPT XX X Press to return to previous parameter Press to return to previous parameter Optional Sample Probe Control Probe To Calibrate Chart 3 1 Calibrate Mode Numbers increase Numbers decrease Press Enter arrow to save setting Scroll for parameters Scroll for parameters Numbers increase Numbers decrease Press Enter arrow to save setting ...

Page 27: ... initiate the test The temperature on the display will begin to increase until the high alarm set point has been reached The audible alarm will sound and the alarm indicator will flash Press the Mute key to silence the alarm The low alarm test is used to verify the that low alarm will activate should the freezer temperature equal or become less than the low alarm set point 1 Press the Mode key unt...

Page 28: ...ator will go off The Low Battery light will stay on until a future battery test is performed and passed To test the charge of the BUS battery 1 Press the Mode key until the Configuration indicator lights 2 Press the right arrow until BUS BAT TEST is displayed in the message center 3 Press Enter to initiate the test TESTING BATT will display during the testing period Upon completion of the test the...

Page 29: ... 1 Press the Mode key until the Configuration indicator lights 2 Press the right arrow until CLR HS ALARM is displayed in the message center 3 Press Enter to clear the alarm To set the Access Code 1 Press the Mode key until the Configuration indicator lights 2 Press the right arrow until SET ACC CODE is displayed in the message center 3 Press Enter 4 The message center will display ACC CODE 000 Pr...

Page 30: ...l BUS back up system allows the user to select which type of gas is injected into the freezer chamber The options are CO2 and LN2 1 Press the Mode key until the Configuration indicator lights 2 Press the right arrow until BUS TYPE CO2 or BUS TYPE LN2 is displayed in the message center 3 Press up down arrow to toggle between the two display selections 4 Press Enter to save This function displays th...

Page 31: ...st Mode HI ALRM TEST Press to return to previous parameter Press to return to previous parameter Press to return to previous parameter Low Alarm Test High Alarm Test System Battery Test To Configure Mode Chart 4 1 Press Enter to initiate test Press to return to previous parameter Optional BUS Battery Test BUS BAT TEST Press Enter to initiate test Configuration Mode Press Enter arrow to save settin...

Page 32: ... Press to return to previous parameter Display Temperature SAMPLE probe Mode Press Enter to save the setting Mode BUS TYPE CO2 Press Enter to save the setting Press to return to previous parameter Optional Back Up System Type Mode RS485 ADDR Scroll through the addresses 1 24 Press Enter arrow to save the setting Press to return to previous parameter Press Enter to to change the address RS 485 Addr...

Page 33: ...turn to previous parameter refer to previous page Configuration Mode Chart 4 1 Page 3 of 3 Warm Excursion To Configure COLD EX XX Press to return to previous parameter Cold Excusion Press Enter arrow to reset the cold and warm excursion values Reset Excursions RST EXCUR Mode Scroll for Parameters Scroll for Parameters Scroll for Parameters Mode Mode ...

Page 34: ...hen every 8 hours thereafter Description Message Delay Ringback Relay No alarm condition exists SYSTEM OK Power Failure POWER FAIL 1 min 15 min Yes High Temperature Alarm TEMP IS HIGH 1 min 15 min Yes Low Temperature Alarm TEMP IS LOW 1 min 15 min Yes Door Ajar DOOR IS OPEN 1 min 15 min No Low Battery LOW BATTERY 1 min 8 hours No Low BUS Battery optional LOW BUS BATT 1 min 15 min No Control Probe ...

Page 35: ...center one at a time updating at 5 second intervals Pressing Mute during multiple alarms causes all active alarms to be silenced and to ring back in 15 minutes An internal communication failure has occurred with the micro board During this alarm the compressor s attempt to run continuously However with this type of failure freezer operation becomes undependable Communication between the micro boar...

Page 36: ...lerable range 55 Hz Freq 70 Hz for 60 Hz units 40 Hz Freq 55 Hz for 50 Hz units Response This condition is checked at power on reset and if it is active the unit will NOT power up The unit will indefinitely display Er_1 in the display and continue to monitor the frequency and voltage Furthermore the audible alarm will sound Other startup error messages may be displayed prior to this mes sage howev...

Page 37: ...play firmware has failed to pass its CRC CCITT checksum integrity test Response The display performs this check at startup and the display board will fail to startup with out any error indication if it does not pass this at power on Er06 N A Name Micro Firmware Integrity Failure Description The micro firmware has failed to pass its CRC CCITT checksum integrity test Response This is checked at powe...

Page 38: ...ponse The display shows Er11 N A SMPL PRB FLT Name Sample Probe Sensor Failure Description This condition indicates that the sample probe sensor has failed to produce a valid reading for 12 consecutive reads 60 seconds Response The message center shows SMPL PRB FLT dErr N A This is a general display error in which the value being displayed can not be represented within the characters provided four...

Page 39: ...terial and gently pull out to remove 3 Wash the filter material using water and a mild detergent 4 Dry by pressing between two towels 5 Install the filter back into the grille and close the door Depending upon environmental conditions the filter may need to be cleaned or replaced more frequently If the filter becomes torn or excessively dirty a replacement can be purchased from VWR Order part numb...

Page 40: ...leaned a minimum of once per month Using a soft cloth remove any frost build up from the gasket sub lids and lids The clean gasket alarm occurs every three months as a reminder to remove frost build up from the gasket and doors Press the Mute key to silence the audible alarm The lid gasket may need to be cleaned more frequently if dirt or excessive frost build up prevents the door from closing pro...

Page 41: ...to negative 7 Replace the recorder bezel 8 Turn the battery power switch to Standby mode 9 Close lower panel door 1 Open the lower panel door by locating the handle on the underside of this door and pulling 2 Locate the battery power switch Figure 6 2 Turn the battery power switch to the Off position O 13 and 20 cu ft 368 and 566 liters Models micro board battery bracket battery switch probe acces...

Page 42: ...orner The battery is rectangular in shape located on the left sideof the filter compartment 2 Directly above the battery s is the battery power switch Turn the battery power switch to the off position O 3 Remove the three wingnuts that secure the cover on the battery Remove the cover 3 cu ft 85 liters Models continued 4 Remove the battery from the mounting bracket 5 Disconnect the red and black wi...

Page 43: ...ure the cover on the battery Remove the cover 5 Remove the battery from the mounting bracket 6 Disconnect the red and black wires from the battery 7 Use a voltmeter set to DC volts Matching the wire colors connect the meter to the battery 8 If the voltage reads less than 10 8 volts replace the battery If above 10 8 re install as previously 9 Re install side panel Turn the battery power switch to S...

Page 44: ...ween shelves Fill a chest by starting at the left side near the probe Filling with room temperature racks will result in a long pull down time Fill unit with frozen product to help overall performance frozen water jugs for example Always make certain the vacuum relief port is free of frost and ice to allow for timely re entry into the freezer after a door opening Action Monthly Yearly Every 2 Year...

Page 45: ...If power to the freezer fails or temperature increases to the back up alarm set point the BUS injects liquefied gas into the chamber to keep the chamber temperature within the specified range The BUS operates on an internal 12 volt rechargeable battery which is kept charged during normal operation by the integral battery charger 1 Locate the mounting hole for installing the injection tee assembly ...

Page 46: ... be equipped with a siphon tube s 1 Plug the solenoid probe connector into the BUS connection Loop the probe wire back into the base side car Secure the connector with a screw on the ends of the connector The connector is keyed 2 Route the temperature probe through the probe port The probe port is located in the upper right corner viewed from the side of 12 7 and 20 cu ft models and in the lower r...

Page 47: ...ws securing the probe cover see Figure 7 5 5 Route the BUS probe through the probe port approximately 12 Secure the back up probe to the temperature probe using a small tie wrap Figure 7 5 6 Seal around the interior and exterior opening of the probe port with Permagum sealant 7 Reinstall the probe cover Figure 7 5 micro board battery bracket battery switch probe access port Figure 7 4 Probe Access...

Page 48: ...ot inject the refrigerant for a Hold off period calculated as follows Hold off period 12 hour is between 0 and 70C 12 hour is between 0 and BUS Setpoint Hysteresis 0 hours is below BUS Setpoint Hysteresis 0 hours is temperature Out Of Range or both probes fail b The Low Battery indicator may also illuminate 4 Turn the battery switch to Standby mode to charge both batteries The following section de...

Page 49: ...senses the solenoid is active and calling for injection 2 Fault Code This same user interface will also permit fault codes to be easily viewed when the user presses and releases the Press to Test button in less than 2 seconds When this occurs both the Low Battery LED and Solenoid Engaged LED will blink twice ON OFF quickly indicating that fault code display mode is active For the next 10 seconds t...

Page 50: ...working fluid changes the BUS acknowledges the set point acceptance by causing the Low Battery LED and Solenoid Engaged LED to blink three times ON OFF quickly This does not imply that the BUS error checked the values other than that the value received was within the range of the BUS working correctly with prior programming Note The solenoid will not engage if lid is open s Caution The back up sys...

Page 51: ...he setting 5 Press the Mode key until the Run indicator lights or press the right or left arrow to go to the next or previous parameter If no control keys are pressed the freezer will automatically return to RUN mode after 5 minutes Warning Changing operating temp set point can affect BUS set point BUS set point self adjusts to maintain a temp of at least 10 C above the operating temp set point s ...

Page 52: ...es on the BUS probe per Table 7 1 Also verify solenoid operation by performing a Press To Test To disconnect the freezer back up from the gas supply 1 Close the supply valve 2 Depress the test button on the Back Up System control box to remove the gas from the line 3 Slowly disconnect the fitting assembly from the supply in the event that any gas remains in the line The following sections describe...

Page 53: ...present program setting 4 To change the program setting press the left or right arrows to increase or decrease the count 5 When the desired program number is flashing press button 3 to bring the pen arm back onto the chart Recording will begin in the new program The recorder must be in service for 24 hours before performing the following calibration procedure 1 Place an accurate thermometer in the...

Page 54: ...the pen begins to move Release the button when the pen position matches the thermometer Note The felt tip pen on the recorder requires periodic replacement Usually the ink will appear to fade before replacement becomes necessary Additional pen tips may be purchased from VWR s 7 10 VWR Collection VWR International Section 7 Specifications Calibrate Chart Recorder cont ...

Page 55: ...8 1 VWR Collection VWR International Section 8 Parts ...

Page 56: ...VWR Collection 8 2 VWR International Section 8 Parts ...

Page 57: ...8 3 VWR Collection VWR International Section 8 Parts 3 0 cu ft Chest Freezer Lid 5608 200 1 B Rev 3 Page 1 of 2 ...

Page 58: ...3 0 cu ft Chest Freezer Lid 5608 200 1 B Rev 3 Page 2 of 2 VWR Collection 8 4 VWR International Section 8 Parts ...

Page 59: ...8 5 VWR Collection VWR International Section 8 Parts ...

Page 60: ...VWR Collection 8 6 VWR International Section 7 Specifications ...

Page 61: ...VWR Collection 8 7 VWR International Section 8 Parts ...

Page 62: ...8 8 VWR Collection VWR International Section 8 Parts 902 204 1 B Rev 2 Page 1 of 2 230V RELAY ENCLOSURE ASSEMBLY ...

Page 63: ...902 204 1 B Rev 2 Page 2 of 2 230V RELAY ENCLOSURE ASSEMBLY VWR Collection 8 9 VWR International Section 8 Parts ...

Page 64: ...8 10 VWR Collection VWR International Section 8 Parts Exploded Drawing 120V Relay Enclosure Freezers 902 204 2 B Rev 2 Page 1 of 2 ...

Page 65: ...Exploded Drawing 120V Relay Enclosure Freezers 902 204 2 B Rev 2 Page 2 of 2 VWR Collection 8 11 VWR International Section 8 Parts ...

Page 66: ...8 12 VWR Collection VWR International Section 8 Parts 120230 01 1 B Rev 7 Page 1 of 2 Chest Freezer Start Component Enclosure Assembly ...

Page 67: ...120230 01 1 B Rev 7 Page 2 of 2 Chest Freezer Start Component Enclosure Assembly VWR Collection 8 13 VWR International Section 8 Parts ...

Page 68: ...9 1 VWR Collection VWR International Section 9 Refrigeration Schematics ...

Page 69: ...VWR Collection 9 2 VWR International Section 9 Refirgeration Schematics ...

Page 70: ...VWR Collection 9 3 VWR International Section 9 Refirgeration Schematics ...

Page 71: ...9 4 VWR Collection VWR International Section 9 Refrigeration Schematics ...

Page 72: ...10 1 VWR Collection VWR International Section 10 Electrical Schematics ...

Page 73: ...VWR Collection 10 2 VWR International Section 10 Electrical Schematics ...

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Page 75: ...VWR Collection 10 4 VWR International Section 10 Electrical Schematics ...

Page 76: ...VWR Collection 10 5 VWR International Section 9 Section title ...

Page 77: ...10 6 VWR Collection VWR International Section 10 Electrical Schematics ...

Page 78: ...VWR Collection 10 7 VWR International Section 10 Electrical Schematics ...

Page 79: ...10 8 VWR Collection VWR International Section 10 Electrical Schematics ...

Page 80: ...VWR Collection 10 9 VWR International Section 10 Electrical Schematics ...

Page 81: ...10 10 VWR Collection VWR International Section 10 Electrical Schematics ...

Page 82: ...VWR Collection 10 11 VWR International Section 10 Electrical Schematics ...

Page 83: ...10 12 VWR Collection VWR International Section 10 Electrical Schematics ...

Page 84: ...eplacement or repair of component parts or equipment under this warranty shall not extend the warranty to either the equipment or to the component part beyond the original two year warranty period VWR must give prior approval for the return of any components or equipment THIS WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES WHETHER WRITTEN ORAL OR IMPLIED NO WARRANTIES OF MERCHANTABILITY ...

Page 85: ...Expendable items i e glass filters pilot lights light bulbs and door gaskets are excluded from this warranty Replacement or repair of component parts or equipment under this warranty shall not extend the warranty to either the equipment or to the component part beyond the original two year warranty period VWR must give prior approval for the return of any components or equipment THIS WARRANTY IS E...

Page 86: ...y agreement This warranty does not apply if the product has been damaged by accident abuse misuse or misapplication or from ordinary wear and tear Expendable items i e glass filters pilot lights light bulbs and door gaskets are excluded from this warranty If the required maintenance and inspection services are not performed according to the manuals and any local regulations such warranty turns inv...

Page 87: ...t of your body to touch objects cooled by liquid nitrogen Such objects may stick fast to the skin and tear the flesh when you attempt to free yourself Use tongs to withdraw objects immersed in the liquid and handle the object carefully Wear protective clothing Protect your eyes with a face shield or safety goggles safety glasses without side shields do not give adequate protection Always wear glov...

Page 88: ...perties are very similar to those of nitrogen precautions and safe practices for the handling and use of liquid argon are the same as those for liquid nitrogen Use only containers designed for low temperature liquids Cryogenic containers are specifically designed and made of materials that can withstand the rapid changes and extreme temperature differences encountered in working with liquid nitrog...

Page 89: ...into liquid nitrogen liquid will spout from the top of the tube due to gasification and rapid expansion of liquid inside the tube Warning Nitrogen gas can cause suffocation without warning s Store and use liquid nitrogen only in a well ventilated place As the liquid evaporates the resulting gas tends to displace the normal air from the area In closed areas excessive amounts of nitrogen gas reduce ...

Page 90: ... gas tends to displace the normal air from the area In closed areas excessive amounts of CO2 gas reduce the concentration of oxygen and can result in asphyxiation Because CO2 gas is colorless odorless and tasteless it cannot be detected by the human senses and will be breathed as if it were air Breathing an atmosphere that contains less than 18 oxygen can cause dizziness and quickly result in unco...

Page 91: ...arm and at rest If exposed to liquid or cold gas restore tissue to normal body temperature 98 6 F as rapidly as possible followed by protection of the injured tissue from further damage and infection Remove or loosen clothing that may constrict blood circulation to the frozen area Call a physician Rapid warming of the affected part is best achieved by using water at 108 F Under no circumstance sho...

Page 92: ...Collection Upright Freezers CI Field Installed Option x x 10185 072 471 1147 Chart Recorder Pen VWR Collection Chest Freezers CI Field Installed Option x x 10185 068 471 1148 Chart Recorder Inkless VWR Collection Upright Freezers CI Field Installed Option x x 10185 076 471 1149 Chart Recorder Inkless VWR Collection Chart Freezers CI Field Installed Option x x 10185 082 471 1150 S S Shelf Kit 13 Cu...

Page 93: ...VWR International D 2 Chest Freezer ...

Page 94: ......

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