Micro Cryo-Trap

for use with the Short Path Thermal Desorption System (TD-4)

• Controlled by the SPTD Model TD-4
• 2 models available
• Model 972 for CO₂ Cooling to -70 deg C
• Model 982 for Liquid N₂ Cooling to -180 deg C
• Reduction of CO₂ or LN₂ use by 90% as compared to cooling the entire oven
• Dual programmable cryo cooling and heating cycles
• Trap compounds in the GC Oven at the head of the GC column
• Remote input connector for cryo cooling to heating cycle switching via GC, Desorption or manually
• Rapid heating up to 400 deg C at greater than 400 deg per minute

The Micro Cryo-Trap(tm) consists of a small heating/cooling chamber which is 3/4" in diameter and 1.0" long which mounts to the bottom of the GC injection port just inside the GC oven. In the center of the chamber is a small stainless steel capillary through which the capillary column freely passes. Capillary columns up to megabore (0.53mm I.D.) diameters can be used. Around the stainless steel capillary tube a heating coil is wound to provide for the rapid heating of the capillary tube. A thermocouple provides accurate measurement of both the cooling and heating temperatures. Either Liquid C02 (Model 972) or Liquid Nitrogen (Model 982) for cooling is introduced into the Micro Cryo-Trap(tm) for cooling is introduded into the Cryo Trap and is exhausted through the outlet. The exhaust can either be vented into the GC Oven or a tube can be attached to vent the cooling gas external to the GC.

The control of the Micro Cryo Trap is provided via output signals from the SPTD Model TD-4.  Both the Cryo-Cooling and the heating temperatures are set and regulated via this digital temperature controller. In addition the SPTD controller regulates the time of each heating and cooling cycle.
 

NOTE:  The Model 972 and 982 are only for use with the Model TD-4 Short Path Thermal Desorption System.

Two models of the Micro Cryo-Trap are now available. The Model 972 is designed for liquid CO₂ use only for cryo-trapping temperatures down to -70 °C. The Model 982 is designed for Liquid Nitrogen use only for cryo-trapping temperatures down to-180 °C. Each model can maintain any cooling temperature within +/- 3 °C from its minimum temperature up to room temperature. In order to release the trapped volatiles from the GC Cryo-Traps, both models can heat the GC Cryo-Trap at temperatures up to 400 °C at a heating ramp rate in excess of 1200 deg/minute. Most users prefer to use the C0₂ version of the GC Cryo-Trap (Model 971) due to the ease of handling liquid C0₂ and for applications where -70 °C is an acceptable lower temperature limit.

If lower temperatures are required, then the liquid nitrogen version of the GC Cryo-Trap (Model 981) must be used. The liquid nitrogen delivery lines are larger than the CO₂ lines and the liquid nitrogen lines must be insulated. This makes installation somewhat more cumbersome. In addition the Liquid Nitrogen version uses more cooling gas and is slightly more audible.

Depending on the make and model of your GC, an installation kit must be ordered separately as described below. First you must decide which model of Cryo-Trap is required for your application; the Model 972 for use with C0₂, or the Model 982 for use with liquid Nitrogen. Although the Cryo-Trap can be used for both CO₂ and LN₂, the electronics are not interchangeable for the two systems.

You must then select which installation kit is required based on the make and model of your gas chromatograph. Either of the two Micro Cryo-Trap(tm) models will fit the same installation kits listed. 

The Model 972 Micro Cryo-Trap is designed for use with liquid CO₂ tanks with a DIP tube. The minimum temperature of cooling is -70 °C. This model comes with the Micro Cryo-Trap, the dual temperature electronics controller, connecting cables and stainless steel connecting line.

The Model 981 Micro Cryo-Trap is designed for use with liquid nitrogen tanks (low pressure). The minimum temperature of cooling is -180 deg. C. This model comes with the Micro Cryo Trap, the dual temperature electronics controller, connecting cables and copper connecting line.

UOM=EA
Part No.	Description	ship wt.	Quantity In Stock	Price	Quantity to order
972250	Model 972 Micro Cryo-Trap for use with liquid C02, Cryo Valve, and SS connecting lines	10	0(#)	$1569.75
982250	Model 982 Micro Cryo-Trap for use with liquid Liquid Nitrogen , CryoValves and copper connecting line	10	0(#)	$1569.75
(#) Standard lead-time for out-of-stock items is approximately two weeks.
Ordering information. International (non-US) prices available through your local dealer.

Model 981 Micro Cryo-Trap for use with Liquid Nitrogen

Cryo-Trap Installation Packages

Depending on the make and model of Gas Chromatograph one of the installation packages must be ordered for the installation of the GC Cryo-Trap. The Cryo-Trap installation kits include relays, mounting hardware, cables and other parts required to mount the Cryo-Trap into the particular model of gas chromatograph.

UOM=EA
Part No.	Description	ship wt.	Quantity In Stock	Price	Quantity to order
900110	Cryo-Trap Install Kit for HP 5890A	1	0(#)	$265.00
900111	Cryo-Trap Install Kit for HP5890 Series I and II	1	0(#)	$210.00
900112	Cryo-Trap Install Kit for HP6890	1	0(#)	$89.50
900120	Cryo-Trap Install Kit for Varian 3400/3600/3700 with 1075 Split/Splitless Injector, 1040 Megabore Injector, 1041 Universal Injector, 1077 Split/Splitless Capillary Injector	1	0(#)	$106.00
900121	Cryo-Trap Install Kit for Varian 3600 w/ 1078 Injector	1	0(#)	$106.00
900130	Cryo-Trap Install Kit for Shimadzu GC-9A	1	0(#)	$108.00
(#) Standard lead-time for out-of-stock items is approximately two weeks.
Ordering information. International (non-US) prices available through your local dealer.

References and Literature

• Micro Cryo-Trap Theory of Operation - Description
• Application Note # 38 - A New Micro Cryo-Trap for Trapping of Volatiles at the front of a GC Capillary Column
• Application Note # 19 - Design and Application of the SIS GC Cryo-Trap
• Application Note # 24 - Selection of GC Guard Columns for Use with the GC Cryo-Trap
• Application Note # 28 - Analysis of Volatile Organics in Latex Paints by Automated Headspace Sampling and GC Cryo-Focusing
• Application Note # 29 - Analysis of Volatile Organics in Oil Base Paints by Automated Headspace Sampling and GC Cryo-Focusing
• Application Note # 30 - Comparison of Cooking Oils by Direct Thermal Extraction and Purge and Trap GC/MS
• Application Note # 31 - Volatile Organic Composition in Several Cultivars of Peach by Thermal Desorption with Cryo-Trapping
• Application Note # 34 - Selection of Thermal Desorption and Cryo-Trap Parameters in the Analysis of Teas
• Application Note # 35 - Volatile Organic Composition of Cranberries by Thermal Desorption with Cryo-Trapping

Application Note # 36 - Identification of Volatile Organic Compounds in a New Automobile by Thermal Desorption with Cryo-Trapping

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