Simple Temperature Control Accessories For Probes
(Prices listed are USA prices. Foreign prices are higher, plus taxes.)
A Wide Temperature Range is Normal
For Doty MAS & Other Doty NMR Probes:
Standard VT Ranges
-80°C to +120°C for NB Standard VT
-140°C to +170°C for WB Standard VT
Extended VT Ranges
-150 to +150°C NB XVT (Extended VT)
-150 to +250°C WB XVT (Extended VT)
-170°C WB LXVT (Low Extended VT) with a Doty temperature controller. To extend the temperature range, we add extra insulation and thermal baffles, utilize special materials, add additional room air, and in some cases, add extra dewars to the probe.
For Probes with Extended Temperatures above 160°C and below -100°C the hot or cold gases must be exhausted away from the magnet. We do this in two ways. With some probes including the wide bore triple-tuned H/X/Y Ultra-range MAS probes (high temperature or low temperature), cryogenic probes, PFG probes, Liquids Probes, and a few other special probes the VT gas is exhausted with a tube out the base of the probe. (An extension can be added to the tube to carry the VT gas further away from the magnet if desired.) In most Narrow Bore, and Wide Bore double-tuned H/X MAS probes, a Probe Exhaust Dewar (listed below) will exhaust the VT gas out the top off the probe.
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# 95980 Probe Exhaust Dewar ………………….. $ 1010
In most Narrow Bore MAS probes and Wide Bore double-tuned H/X MAS probes, a Probe Exhaust Dewar is required for sample temperatures above 160°C and below -100°C. The exhaust dewar is included in extended VT probe options but may be ordered separately. Please supply the probe serial number when ordering to ensure the proper dewar is supplied.
Simple Cold-Gas Supply Systems
The Doty cold gas supplies include a heat exchanger with one, two or three intertwined pre-cooling coils; appropriate cooling coil sets; and one, two or three transfer lines to carry the cooled gas to the probe. (The pre-cooler counterflow heat exchanger in the storage dewar neck greatly improves cooling efficiency – an important consideration for extended runs.)
The heat exchanger is connected to the Doty probe with the flexible, foam-insulated transfer lines with fully dewared quick connects. This system provides efficient cold gas supply for temperatures down to -160°C. The cold gas supply shown below is connected to a probe at one end and connected to a flow meter and regulated gas supply on the other. The system is designed to be used with the probe exhaust dewar (listed above) and standard 50-liter nitrogen dewar (listed below) — both of which must be ordered separately.
# 99860 Single-Supply Cold Gas System …… $4,040
This cold-gas supply is for, standard speed or wideline probes and other single-supply applications.
# 95970 Dual-Supply Cold Gas System …….. $5,940
For spinning with separate bearing and drive or for other dual-supply applications. (Includes two intertwined pre-cooling coils, two cooling coil sets, and two transfer lines.)
# 86020 50-Liter Liquid Nitrogen Dewar …….. $2,140
This dewar is intended to be used with the Doty Cold-Gas System. (A Nitrogen Dewar already owned or purchased locally may be used if compatible with the cold-gas system, however specifications must match.)
Doty Cold Gas Supply – Installation Diagram
(Single Supply Shown)
