ESS (Environmental Stress Screening) Chambers

Thermal Shock Chambers - Air to Air

The TSV, TSH, TSD Series from Russells Technical Products

What is ESS?

ESS is a means of screening products to expose detects such as defective parts or process problems that can't be detected upon visual inspection or electrical testing. Developed to detect product defects and production flaws in electronics manufacturing, ESS uses thermal cycling or vibration to expose failures. Environmental stress screening chambers can be used as part of the manufacturing process or they can be used in new product qualification testing..

Russells air-to-air thermal shock chambers meet the demands of today's environmental stress screening with proven performance in installations around the world. Our direct transfer method between hot and cold is an economical method to achieve rapid part temperature change for ESS or thermal shock.

Thermal Shock Chambers

Russells air-to-air thermal shock chambers are available in three configurations:

• TSV Series Two Zone (hot/cold) Vertical - direct hot/cold transfer
• TSH Series Three Zone (hot/ambient/cold) Horizontal - direct hot/cold transfer with selectable ambient temperature dwell required for some MIL-STD's.
• TSD Series Double Duty (hot/cold/hot) - direct hot/cold transfer with additional hot zone and second transfer carriage effectively doubles throughput capacity for high volume production.
• Sizes from 30 l (1 cu ft) to 450 l (16 cu ft) capacity
• Cold zone temperatures to 73° C (-100° F)
• Hot zone to 200° C (392° F)
• Automatic transfer of test specimens between zones

ESS Chambers for temperature cycling environmental stress screening:

• Cascade low temperature to -73° C (-100° F)
• Single stage to -20° C (-4° F)
• High temperature to 177° C (350° F)
• Transition rates to 30° C/min (54° F/min)
• Humidity from 20% to 95% RH.
• Available with passive or power product fixturing
• Cart based or backplane style

A Russells application engineer can assist you in selecting the ESS chamber configuration and size that's best for you or we can custom design any standard chamber configurations.

Standard Thermal Shock Chamber Features:

Cabinet

• Chamber liners heliarc welded and dye checked brushed 304 stainless steel.
• Fiberglass insulation, 0.25 K factor.
• Welded structural steel frame.
• Service panels removable with quick release fasteners.
• Chamber fan motors externally located.
• Dual silicone door gaskets.
• Cold Chamber drain.

Electrical

• All writing meets NEC standards
• 120 volt control circuit transformer.
• Fully enclosed electrical panel.
• All circuits fuse of circuit breaker protected.
• System status indicator pilot lamps.
• All wiring numbered or color coded.
• High temperature limit control.
• Master heating circuit contactor.
• Air circulator/heater interlock.
• Balanced load on 3 phase power.
• Chamber door interlocks.
  

Refrigeration

• Low temperature, ozone friendly, cascade refrigeration system.
• Energy saving refrigeration bypass capacity control.
• Low stage desuperheater.
• Oil pressure switches.
• Compressor suction and discharge pressure switches.
• Water cooled condenser.
• Automatic condenser water control valve.
• Vapor tank and condenser ASME certified.
• Compressor overload protection.
• High stage compressor crankcase heater.
• Compressor head fans.
• Low stage oil separator.
• All piping joints silfosed or silver soldered.
• Stainless steel compressor condensate pans.

Instrumentation

• Microprocessor programmer/controller.

Optional Accessories:

• Traveling access port to transfer basket.
• Dry air purge.
• Refrigeration sound deadening package.
• Refrigeration gauges.
• System running time meter.
• Electrical disconnect switch
• Transfer basket shelves or fixturing.
• Remote refrigeration.
• CO2 or LN2 boost cooling
• Air cooled condenser.

Optional Instrumentation:

• Computer communication ports.
• Programmable on/off even relays.
• Product safeguard over/under failsafe temperature limit.
• Circular chart or strip chart recorder.
  

TSD Series Double Duty Air-to-Air Thermal Shock Chambers

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