506A User Manual - Electro Tech Systems
Contents
1. The ETS Model 513 Automatic Humidity Controller will precisely control separate heating and cooling units supplied separately or by the customer to achieve temperature stabilization Obtaining a Given Humidity and Temperature Condition It may not be possible to achieve all desired humidity levels at all temperatures Dew point conditions may limit the temperature and humidity extremes that can be obtained In addition when the temperature inside the chamber exceeds 100 F the maximum humidity obtainable will be less than 98 RH specified 5 4 2 5 4 3 5 4 4 5 4 5 Low Humidity and High Temperature High temperatures will tend to reduce the humidity level inside the chamber but not as severely as with low temperatures Set the Temperature Controller for the desired temperature level After the temperature inside the chamber has stabilized turn on the DEHUMIDIFY function and set the Humidity Controller for the desired humidity level High Humidity and High Temperature Follow the procedure described in Section 5 4 2 above except increase the TEMP level to the desired temperature After it reaches the set point set the Humidity Controller for the desired humidity level Intermediate Humidity and Temperature Follow the above procedures whereby the desired temperature is first established in the chamber then the humidity is adjusted to the desired level Maintaining Selected Humidity and Temperature Levels 11 5 5 Dehumi2. chamber Tighten the hex nut with finger force only Remove the tape backing from the Velcro and install the sensor electronics module above the hex fitting Plug the sensor cable connector into the SENSOR receptacle located on the rear of the controller Plug the pump AC power in to the AC receptacle also located at the rear of the controller Plug the fan power cord into the appropriate AC receptacle Turn the controller power on If humidity indication only is desired turn the PUMP switch to OFF otherwise leave the switch in the ON position When opening the access door for a period of time turn this switch off and unplug the fan power cord to reduce drawing outside air into the chamber 9 5 2 3 For more detailed operation of the Model 512B Automatic Humidity Controller refer to the Model 512B Instruction Manual If the ambient humidity is slightly lower than the desired humidity the humidity within the chamber can still be controlled by the Model 512B but the ambient level within the chamber must first be raised Place a small container of water inside the chamber with a moveable cover As the water evaporates inside the chamber the humidity will rise Turn the PUMP switch on the controller to OFF This will allow the controller to perform only as a precision humidity indicator When the humidity rises to approximately 5 above the desired level cover the water container about two thirds and turn the PUMP switch back on The moisture
3. from the dish will cause the humidity to rise while the controller will cause the humidity to drop thus providing automatic humidity control Model 514 Automatic Humidity Controller Dehumidification Humidification This controller in conjunction with the Model 5612 Ultrasonic Humidification System enables the Model 506A Chamber to operate over practically the entire O to 100 RH range The Model 514 Controller is a bi directional version of the Model 512B It controls separately the dehumidification and the humidification functions To install the humidification system connect the output tube from the humidifier to the 1 hose barb located at the top of the left side of the chamber Plug the AC power cord into the HUMIDIFY AC receptacle located on the rear of the Model 514 Controller The humidity sensor is installed as described in section 5 2 2 Turn the controller on Allow a few minutes for warm up Observe the humidity reading on the LCD display If the desired humidity inside the chamber is to be less than the ambient level turn the DEHUMIDIFY switch on and the HUMIDIFY switch off Depress the READ SET switch to SET and turn the HUM SET ADJUST control until the desired level is displayed on the meter The green DEHUMIDIFY LED will light and the pump will turn on As the air inside the chamber is circulated through the desiccator the humidity level will drop The desiccator unit will begin to turn pink starting from the bottom The sy
4. MODEL 506A HUMIDITY CONTROL CHAMBER USER MANUAL NOTE ets CONTROLLED ENVIRONMENT CHAMBERS ARE FABRICATED FROM CLEAR AND WHITE ACRYLIC WHICH IS A HYDROSCOPIC MATERIAL THEREFORE THE FOLLOWING PRECAUTIONS SHOULD BE NOTED 1 When used in a high humidity environment it will take longer and will consume more desiccant to stabilize at lower humidity levels within the chamber 2 When humidifying the chamber gt 75 RH for a prolonged period of time the acrylic door will tend to warp This could result in a gap appearing between the door and rubber seal Before taking corrective actions allow the chamber to dry and see if the door returns to its standard shape 3 When operating the chamber at high humidity and elevated temperatures door warping will become quite evident The door will return to its original shape once the chamber is allowed to dry out 4 If high humidity is to be run continuously ets can supply doors with additional latches to help maintain the door to gasket seal 1 0 2 0 General Description Many applications such as electronics medical pharmaceutical and research require a controlled humidity environment for testing assembly or storage The Model 506A Humidity Control Chamber is specifically designed to meet these requirements The standard Model 506A comes complete with a pump desiccant dehumidification system circulating fan temperature humidity indicator neoprene rubber accordion gloves and
5. a function of the ambient conditions Very high ambient humidities i e greater than 60 RH have a significant affect in maintaining humidity levels below 15 On the other hand low ambient humidities require humidification within the chamber to obtain the desired humidity level 5 1 Standard Humidity Chamber With Dial Temperature Humidity Indicators The standard Model 506A comes equipped with dial temperature humidity indicators This type of indicator has a very slow response and can only be used in applications where the humidity level remains constant and the exact level is not critical In applications requiring only a dry environment the standard Model 506A configuration is adequate 5 1 1 Low Humidity under 10 5 1 2 To obtain very low humidity conditions within the chamber proceed as follows Turn on the pump and let it circulate the air through the external desiccator until the lowest humidity level is reached Place the optional 10 pound passive desiccator inside the chamber The humidity will be further reduced and the low humidity condition will be maintained for a long period of time Moderate Humidity 10 to ambient The amount of dehumidification required is dependent upon the ambient humidity conditions If the ambient humidity is above the desired level turn on the pump and allow it to run until the humidity reaches the desired level Let it continue to run until the humidity is approximately 5 RH below this po
6. cessories from the shipping cartons and inspect for any damage When handling the chamber DO NOT use any of the fittings or the door handle as a grip or for leverage Lift the chamber by placing the hand all the way into the glove port and grabbing hold of the chamber wall or gripping around the outside of the chamber The standard chamber includes the following accessories 1 Pump 110V or 220 VAC 2 Desiccator 3 Dial Temperature Humidity Indicators Temperature Indicator only when ordered with Automatic Humidity Controller 4 Clear Plastic Tubing 2 each 48 inches long 5 Sealing compound 6 Instruction Manual 4 2 Installation Unlock the latch by turning the handle counterclockwise until the cam turns away from the chamber wall and then open the access door Place the required test instrumentation inside the chamber and feed any cables through the 1 25 diameter hole located on the left side next to the door Take the soft sealing putty supplied and place it around the cables and seal the hole Make certain that the putty covers all of the cables and creates an airtight seal 5 0 Mount the desiccator to the left hand side of the chamber by first loosening the two 2 hex fittings shown in Figure 4 2 1 Then insert the hose barb extensions on the desiccator fully into the hex fittings and tighten with finger force Connect the pump to the chamber using the two 2 sections of clear plastic tubing as shown in Figure 4 2 1 The pre
7. d only be used when the chamber is dedicated to a single humidity level Measurement accuracy with this system is better than 5 RH The Model 511 Humidity Controller contains both the control and display functions and the humidity sensor Holes must be drilled into the top and rear of the chamber for installation The hole locations and sizes and installation instructions are contained in the Model 511 manual 5 2 2 Model 512B Automatic Humidity Controller Dehumidification This controller can operate over the full 0 to 100 RH range However it can only control the humidity to a level that is below ambient The desired RH level is selected by adjusting the RH SET control located on the front panel Depress the READ SET switch to SET and then turn the SET ADJUST control until the desired level is displayed on the meter Set the PUMP ON OFF switch to ON The red indicator will light and the pump will automatically turn on and circulate the air in the chamber through the desiccator until the desired level is reached The pump will then automatically turn off and remain off until the humidity level inside the chamber exceeds the set point by 0 5 RH The pump will cycle on and off to maintain the set level until the effectiveness of the desiccant is depleted pink indication Install the humidity sensor into the hex fitting shown in Figure 3 1 2 1 Push the sensor into the fitting until the sensor grill is totally clear of the fitting inside the
8. dify Frequent on off cycling of the dehumidifier or humidifier may be indicative of a poor access hole or door seal or a tear in the gloves The chamber should be thoroughly inspected to determine where the leak s are occurring and the problem corrected However other circumstances can also effect the humidity level Water absorbing materials such as wood and paper that have been in a high humidity environment prior to being placed in the chamber may overload the dehumidification system and it may take several desiccator renewals to dry out the material and bring the chamber down to the desired level 5 5 1 The desiccant can only be renewed approximately ten 10 times before having to be replaced Worn out desiccant is indicated by the dehumidification system appearing to operate normally but the humidity level inside the chamber fails to decrease or may even increase Humidify If the chamber fails to humidify and the system appears to be functioning correctly then the problem is most likely to be in the humidifier First check that the tank is filled with water If the tank is filled then check to see if the hose between the humidifier and the chamber is clogged with water droplets This is easily corrected by blowing into the tube to clear out the droplets Next remove the tank and check to see if the bottom of the humidifier is filled with water If it is remove the water Refill the tank to capacity and place it back onto the hu
9. e chamber as shown in Figure 2 0 1 The humidity within the chamber is reduced using a desiccant pump drying system The desiccator contains a self indicating renewable drying agent Anhydrous CaSO and is mounted externally to the chamber A small pump draws air from the chamber and forces it through the desiccator back into the chamber This circulating system is capable of producing very low humidities within the chamber If required a nitrogen drying system can be used instead Temperature and humidity indicators are provided to monitor the environmental conditions inside the chamber A continuous running 3 inch 32 cfm fan circulates the air within the chamber to maintain a uniform humidity and temperature Note At low humidity the dial indicator for measuring humidity has an accuracy of 5 RH and should be used for reference only For accurate relative humidity measurement and control use the ETS Model 511 512B or 514 Automatic Humidity Controllers 3 0 Access Hole Humidity Sensor Pump Output Pressure Pump Input Vacuum Figure 2 0 1 Optional Equipment 3 1 Automatic Humidity Control Automatic humidity controllers are available to provide single point dehumidification adjustable dehumidification and bi directional dehumidification and humidification control All of the controllers operate in the same basic manner When the measured humidity exceeds the set poin
10. e purchased from other manufacturers shall be subject only to that manufacturer s warranty The Seller s liability hereunder is expressly limited to repairing or replacing any parts of the equipment manufactured by the manufacturer and found to have been defective The Seller shall not be liable for damage resulting or claimed to result from any cause whatsoever This warranty becomes null and void should the equipment or any part thereof be abused or modified by the customer of if used in any application other than that for which it was intended This warranty to replace or repair is the only warranty either expressed or implied or provided by law and is in lieu of all other warranties and the Seller denies any other promise guarantee or warranty with respect to the equipment or accessories and in particular as to its or their suitability for the purposes of the buyer or its or their performance either quantitatively or qualitatively or as to the products which it may produce and the buyer is expected to expressly waive rights to any warranty other than that stated herein ETS must be notified before any equipment is returned for repair ETS will issue an RMA Return Material Authorization number for return of equipment Equipment should be shipped prepaid and insured in the original packaging If the original packaging is not available the equipment must be packed in a sufficiently large box or boxes if applicable of double wall construc
11. eat the above procedure several times High Humidity above ambient To achieve high humidity levels above ambient insert a dish of water along with an adjustable cover When the humidity reaches the desired level cover the dish A small opening should be left to maintain the humidity If the humidity goes beyond the desired level turn on the pump for a few moments to reduce the level This technique is only effective for increasing humidity levels up to 60 RH and for short term applications The above procedures are only to be used if the chamber humidity is to be altered on an occasional basis If precise humidity control and or a desire to 5 2 achieve varying humidity levels are required one of the ETS Automatic Humidity Controllers must be used Humidity Chamber with Humidity Control ETS Automatic Humidity Controllers are capable of controlling and maintaining the relative humidity level in the Model 506A Humidity Chamber to within 0 5 of the desired set point at the sensor Where the specification or application requires both accurate humidity measurement and limited deviation from the specified level an Automatic Humidity Controller must be used 5 2 1 Model 511 Humidity Controller Dehumidification This controller operates around a preset humidity level between 5 and 30 RH The set point can be adjusted between these limits by the user following the procedure outlined in the Model 511 instructions The Model 511 shoul
12. ensor for any level between 0 and ambient and can measure the humidity over the entire 0 to 100 RH range A fast responding capacitive type sensor has a measurement accuracy of 2 RH over the range of 0 to 90 and 3 RH from 90 to 100 RH A 3 1 2 digit LCD readout with 0 1 RH resolution provides precise indication of the set point and measured humidity level The controller and sensor are separate units A fitting is provided on the left hand side of the chamber for installing the sensor as shown in Figure 3 1 2 1 Model 514 Automatic Humidity Controller The Model 514 is a bi directional version of the Model 512B It utilizes the same sensor and has the same performance specifications However it has two solid state switching circuits to separately operate the dehumidification and the humidification systems Front panel switches enable the user to switch either one or both functions off and on Individual LED indicators show the ON OFF status of each mode _ Model 511 Humidity Contr Sensor Figure 3 1 1 1 Figure 3 2 1 3 2 3 3 3 4 3 5 3 6 Model 5612 Ultrasonic Humidification System This system utilizes an ultrasonic generator to produce a fine water mist that is blown into the chamber to increase the humidity level The humidifier is a self contained unit with its own water tank The system is capable of maintaining the humidity level within the chamber at room temperature up to 98 RH The Model 5612 i
13. fittings for installing the optional automatic humidity controller sensor and optional humidification system With this standard system the humidity within the chamber can be reduced below ambient to levels less than 10 RH If the humidity within the chamber must be increased above ambient the optional ETS Model 5612 Ultrasonic Humidification System should be ordered Where precise humidity control is required the chamber can be equipped with any ETS Automatic Humidity Controller such as the Model 511 512B or 514 Other options available for the Model 506A are heating and cooling kits with automatic temperature control ETS Model 513 Automatic Temperature Controller and customization such as increased size multiple access doors iris ports multiple gloves ports etc to meet virtually any user requirement System Description The Model 506A is a nine 9 cubic foot airtight chamber fabricated from 0 25 inch clear and white acrylic and measures 36 W x 24 D x 18 H Access to the chamber is through a 12 square opening A heavy duty clear acrylic door secured by a single half turn latch along with a compression resistant gasket ensures an airtight seal when the door is locked A 1 25 diameter access hole is provided for passing cables and or tubing through the chamber wall A non hardening putty is used to obtain an airtight seal The access door access hole desiccator and all other fittings are located on the left hand side of th
14. int Turn off the pump Depending on the level of activity within the chamber and the integrity of the air tight seal the humidity will begin to rise slowly When the humidity exceeds the desired level by 5 RH turn the pump back on and repeat the cycle As the desiccant absorbs moisture its color will change from blue to pink starting from the bottom of the desiccator When the entire unit turns pink the desiccant should be regenerated in accordance with the procedure in Appendix A The effectiveness of the desiccant before it must be regenerated is a function of how many times the chamber access door is opened and the ambient relative humidity Under normal conditions a single desiccator unit should last between one to five days However when the desiccator must absorb large amounts of moisture the time between regeneration will be much shorter When the desiccant has reached the end of its life it will no longer absorb moisture even though it is light blue in color If the desired humidity level is slightly greater than ambient a small dish of water with an adjustable cover should be placed inside the chamber When the humidity level inside the chamber reaches the desired level the water dish should be covered If too much humidity is produced turn on the pump for a short period of time until the humidity level inside the chamber reaches the desired level Since the dial humidity indicator is slow in responding it may be necessary to rep
15. midifier base Distilled water or water having a low mineral content soft water must be used Use of ordinary tap water will result in the rapid build up of white dust which will clog the ultrasonic transducer If a residue is noticed around the ultrasonic transducer it can be cleaned using a mixture of white vinegar and water approximately 1 tablespoon of white vinegar to 1 pint of distilled water Place the solution in the Mist Chamber and Reservoir and allow it to stand for an hour then thoroughly rinse with clean cool water Refer to the Model 5612 Instruction Manual for care and maintenance of the ultrasonic humidifier 5 5 2 Cool If the chamber fails to cool the problem is most likely an empty CO tank or if it is a replacement tank an incorrect tank type The tank must have a siphon inside that draws the liquid CO and not the gas 12 6 0 7 0 When changing tanks first shut off the main valve on the tank and then turn on the COOL switch lt may be necessary to lower the TEMP ADJUST setting so that the solenoid activates This will release any pressure in the high pressure line 5 5 3 NOTE Calibration As with all measuring instruments the humidity and temperature indicators and controllers should be periodically recalibrated Generally this is usually done every six months or once a year depending on the application ETS provides full calibration services for these instruments Only the control unit and sensor
16. need to be returned for periodic calibration Contact ETS to obtain the necessary RMA authorization Chamber Care The Model 506A is fabricated from clear and white acrylic using the finest materials and workmanship Care should be used when placing objects in or on top of the chamber to avoid scratching When cleaning the chamber use only mild detergents or cleaning solutions formulated for cleaning plastics DO NOT USE UNKNOWN SOLVENTS AS THESE MAY CHEMICALLY REACT WITH THE ACRYLIC AND CAUSE CLOUDING STREAKING OR STRUCTURAL DAMAGE Accidental physical damage to the chamber may be repairable using acrylic solvent cement Contact ETS for assistance 8 0 Warranty Electro Tech Systems Inc warrants its equipment accessories and parts of its manufacture to be and remain free from defects in material and workmanship for a period of one 1 year from date of invoice and will at the discretion of Seller either replace or repair without charge F O B Glenside similar equipment or a similar part to replace any equipment or part of its manufacture which within the above stated time is proved to have been defective at the time it was sold All equipment claimed defective must be returned properly identified to the Seller or presented to one of its agents for inspection This warranty only applies to equipment operated in accordance with Seller s operating instructions Seller s warranty with respect to those parts of the equipment which ar
17. nstalls onto the chamber by connecting a short piece of plastic tubing from the humidifier to the inlet hose fitting located on the left hand side of the chamber as shown in Figure 3 2 1 NOTE Acrylic is a hydroscopic material Very high humidity and or high temperatures could cause a small degree of warping in the access door Model 513 Automatic Temperature Controller The Model 513 is a bi directional controller that is similar in operation to the Model 514 Automatic Humidity Controller except it controls a heater and a cooling system to maintain the temperature within the chamber over a nominal range of 40 F around ambient The 3 1 2 digit LCD readout provides a resolution of 0 1 F with measurement accuracy of 1 8 F 1 0 C Tracking is 0 4 F 0 2 C about the set point The temperature sensor is installed in the chamber by passing it through the cable access hole and mounting it to the side of the chamber using the adhesive backed clip provided Model 5613 Gas Cooling System This system generates cooling by converting liquid CO to a gas A high pressure valve is connected to a tank containing liquid CO via a 48 inch high pressure hose When the valve opens high pressure liquid is forced through an expansion valve which instantly coverts the CO to a very cold gas A high pressure fitting which also incorporates the expansion valve must be retrofitted to the chamber While this system is capable of producing very lo
18. olumn and spread evenly one granule deep on a tray Heat for one hour at about 200 C or 400 F The desiccant should then be cooled in a tight container before refilling the acrylic unit Felt filters should also be pre drilled at 100 C for about 30 minutes before assembly DRIERITE is the trade name for CASO of the W A Hammond Company
19. ssure side of the pump is connected to the hex fitting Insert the tube at least one inch into the fitting and tighten with finger force The vacuum side of the pump is connected to the hose barb fitting If only the standard Model 506A configuration is being used the pump is plugged directly into the appropriate 115 or 230 volt 50 60 Hz AC outlet The pump is manually operated by turning the power to the pump on and off Plug the fan power cord into the appropriate AC receptacle lt can be left on continuously to circulate the air throughout the chamber The Model 506A Humidity Control Chamber is now ready for use NOTE The line voltage must be specified at the time of order so that the appropriate pump and fan can be supplied 4 3 Installation Optional Extender Air Lock The Extender Air Lock is installed onto the chamber by removing the access door Remove the access door from the hinges and replace it with the Extender The Extender has drilled and tapped holes that mate with the hinge assembly The entire Extender swings open for gaining access to the full 12 x 12 chamber opening The smaller door on the Extender is now used to gain access to the chamber during normal operation Operation The Model 506A Humidity Control Chamber can be used to provide a controlled humidity environment from less than 5 R H to 98 RH Many applications however are at humidities of less than 50 The ability to obtain a given humidity is
20. stem will operate until the desired humidity level is reached When the humidity level increases 0 5 RH above the set point level the pump will turn back on The system will continue to cycle to maintain the desired humidity If the desired humidity inside the chamber is to be greater than the ambient level turn the DEHUMIDIFY switch off and the HUMIDIFY switch on Follow the procedure above but now the humidifier will turn on and off to maintain the desired humidity level 5 3 5 4 First make certain the Humidifier POWER switch is turned to ON Adjust the MIST INTENSITY control on the humidifier for the desired humidification rate Sliding the control down will cause the chamber to humidify at a slower rate while sliding the control up will cause the chamber to humidify at a more rapid rate Refer to the Model 5612 Instruction Manual for care and maintenance of the Ultrasonic Humidifier Temperature The temperature inside the chamber will stabilize to the ambient level In most applications this is satisfactory If the ambient temperature is 10 to 15 F below the desired level the temperature inside the chamber can be raised by using a 40 or 60 watt bulb and a light dimmer Either a porcelain fixture can be installed inside the chamber or a small lamp can be used Connect the light to a dimmer which will control the heat level If a more precise control of temperature is required an automatic temperature controller will be required
21. t by more than 0 5 RH a solid state control circuit turns on a pump which circulates the chamber air through the desiccator absorbing moisture and lowering the humidity level in the chamber When the set point humidity level is reached the controller turns off the pump The pump then cycles on and off automatically as required by the controller to maintain the desired set point humidity level The Automatic Humidity Controller can also operate a nitrogen drying system by controlling an AC operated solenoid valve The bi directional controller operates in a similar manner except when the humidity level drops below the set point by more than 0 5 RH a second solid state control circuit turns on a humidifier 3 1 1 Model 511 Humidity Controller The Model 511 controls the humidity to a fixed level that has been preset between 5 and 30 RH It can maintain the humidity to within 0 5 RH of the set 2 3 1 2 3 1 3 point at the sensor with an overall measurement accuracy better than 5 RH A 3 1 2 digit LCD readout provides 0 1 RH resolution of the humidity level indication LEDs indicate the ON OFF status of the controller The sensor is built into the control unit Installation requires drilling a sensor access hole and permanent mounting of the unit to the top of the chamber as shown in Figure 3 1 1 1 Model 512B Automatic Humidity Controller The Model 512B can maintain the humidity level to within 0 5 RH of the set point at the s
22. tion with substantial packing around all sides The RMA number description of the problem along with the contact name and telephone number must be included in formal paperwork and enclosed with the instrument Round trip freight and related charges are the owner s responsibility WARNING WOODEN CRATES MUST NOT BE USED PACKAGING OF DELICATE INSTRUMENTS IN WOODEN CRATES SUBSTANTIALLY INCREASES THE CONTENT S SUSCEPTIBILITY TO SHOCK DAMAGE DO NOT PLACE INSTRUMENTS OR ACCESSORIES INSIDE OTHER INSTRUMENTS OR CHAMBERS ELECTRO TECH SYSTEMS INC WILL NOT ASSUME RESPONSIBILITY FOR ADDITIONAL COST OF REPAIR DUE TO DAMAGE INCURRED DURING SHIPMENT AS A RESULT OF POOR PACKAGING 10 11 12 Appendix A Specifications Column is molded acrylic plastic Dimensions 2 5 8 O D x 11 3 8 Anodized aluminum cap fitted with O Ring gasket Safe for working pressures to 90 psig Desiccant supports and coil spring are of cadmium plated steel DRIERITE is held firmly in place between felt filters Connections are for rubber tubing Tubing should be held with hose clamps when used under pressure Filled with approximately 1 lbs of 8 mesh Indicating DRIERITE Capacity for water vapor up to 50 grams Flow rate should be 200 liters per hour or 0 1 scfm for maximum efficiency Air and gases dried to 100 F dew point Indicating DRIERITE is non toxic and non explosive Regeneration DRIERITE granules should be removed from the c
23. w temperatures its use with the uninsulated Model 506A chamber limits the practical temperature reduction to approximately 40 F below ambient Heaters Both convection and blower type heaters are available from ETS to heat the chamber Continuous temperatures up to 120 F is the suggested range but temperatures up to 150 F can be used for short periods of time Extenders Air Locks 4 0 Custom extenders and air locks are available that replace the access door This effectively increases the chamber volume and is useful when an increase in sample storage or increased room for handling long objects is required The extender can also be configured as an airlock for applications where the environment within the chamber must be precisely maintained at all times 3 7 Desiccators Desiccant A 10 pound passive desiccator is available to allow the Model 506A chamber to be used more effectively as a dry box This desiccator is capable of maintaining the humidity within the chamber to less than 5 RH Also available is a 5 pound jar of renewable indicating CASO desiccant 3 8 Customized Chambers Custom design chambers are also available to meet special customer requirements Custom designs may include but are not limited to over and under sized units additional access doors multiple glove ports and special chamber material such as antistatic acrylic polycarbonate PVC etc SET UP 4 1 Unpacking Unpack the Humidity Test Chamber and the ac
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