Environmental Test Chamber, 

Cincinnati Sub Zero 

Model: ZH-8-1-1-h/a

Temperature Range:

-73ºC (-100ºF) to 190ºC (375ºF) Cascade

-34ºC (-30ºF) to 190ºC (375ºF) Single Stage 

Temperature Stability: 

±1ºC (±2ºF) at steady state condition after stabilization (usually 1 hour) 

±1ºC (±2ºF) ±4% relative humidity at steady state condition after stabilization (usually 1 hour) 

Temperature Performance: 

Cascade 

Temperature pulldown from 23ºC (75ºF) to -40ºC (-40ºF) in 25 minutes ,-54ºC (-65ºF) in 35 minutes, and -68ºC (-90ºF) in 55 minutes 

Single Stage 

Temperature pulldown from 23ºC (75ºF) to -18ºC (0ºF) in 20 minutes and -34ºC (-30ºF) in 40 minutes 

Temperature heatup from 23ºC (75ºF) to: +93ºC (200ºF) in 10 minutes ; 

       +190ºC (375ºF) in 25 minutes

Live Load Capacity: 

Cascade

650 watts at -40ºC (-40ºF) 

450 watts at -54ºC (-65ºF)

Single Stage 

650 watts at -18ºC (0ºF) 

225 watts at -34ºC (-30ºF) 

Interior Dimensions: 610mm (24in)W x 610mm (24in)D x 610mm (24in)H 

Exterior Dimensions: 889mm (35in)W x 1300mm (51in)D x 1960mm (78in)H 

(Addition of certain accessories may increase dimensions) 

Shipping Weight: Single Stage: 925 lbs. Cascade: Approx. 1025lbs.

Utility Requirements: 208/230 volt (-0%, +5%), 60 Hz. 

 ZH-8-1-1-H/AC-1 phase, 35 full load amperes  -3 phase, 26 full load amperes 

Heat Rejection: Approximately 4,500 watts (15,000 BTU/hr) maximum during cooling operation 

Included Accessories:

• Viewing window, 12 3/4 H x 19 3/4 W 

• Interior light with switch 

• Casters, heavy-duty, 75mm (3in) wheel 

• Access port, 70 mm (2.875 in.) 

• Shelf supports 

• Refrigeration service taps 

• Communications port 

• Humidity water demineralizer (ZH-8 Only) Included Instruments: Watlow F4 Controller and High/Low Limit 

MODEL ZH-8 SPECIFICATIONS

Humidity Range: 10% to 95% relative humidity as limited by a 85ºC (185ºF) maximum dry bulb and 4ºC (40ºF) minimum dewpoin