Model 140 Temperature Chamber Specifications

Temperature Range
-73°C to +175°C
Control Tolerance
±0.5°C (±0.2°C Typical) (Short-term variations measured at the control sensor after stabilization)
±0.5°C (Variations throughout the chamber after stabilization)
Cool Down Transition Time*
Start Temp End Temp
+23°C 0°C -40°C -55°C -65°C -73°C
+23°C ----- 4 min 18 min 25 min 33 min Ultimate
+50°C 5 min 10 min 25 min 34 min 42 min Ultimate
+85°C 12 min 18 min 31 min 38 min 45 min Ultimate
+150°C 25 min 32 min 45 min 51 min 58 min Ultimate
Heat Up Transition Time*
Start Temp End Temp
+23°C +50°C +85°C +125°C +150°C +175°C
+23°C ----- 1.5 min 7 min 14 min 20 min Ultimate
0°C 1.5 min 3.5 min 13 min 20 min 23 min Ultimate
-40°C 6 min 11 min 17 min 24 min 30 min Ultimate
-55°C 8 min 13 min 19 min 26 min 32 min Ultimate
-65°C 10 min 14 min 21 min 28 min 34 min Ultimate

Rate Of Change
To calculate rate of change for a particular condition, take the difference between the Start Temp and End Temp and divide by the Transition Time.
Cool Down Example: From +85°C to -40°C = 125°C / 31 min = 4.03°C/min.
Heat Up Example: From -40°C to +85°C = 125°C / 17 min = 7.35°C/min.

*Note: Transition times are measured after a 2 hour soak at the respective start temperature with an empty chamber, as indicated on the temperature controller, 23°C ambient. Measured with setpoint beyond the start and end temperatures. Does not include the effect of proportional band when approaching setpoint. Performance is reduced by 17% with 50 Hz input power.

Live Load Capacity

+23°C 0°C -40°C -55°C -65°C
1,000 Watts 800 Watts 500 Watts 400 Watts 300 Watts

Refrigeration and Heating System

High Stage Refrigerant R-404A (Dupont HP-62)
Low Stage Refrigerant R-508B (Dupont SUVA-95)
Compressors 1.5 HP x 1.5 HP Tecumseh hermetic compressors in a cascade configuration.
Condenser Air Cooled
Heat of Rejection 14,800 BTUH (maximum rated chamber load at maximum cooling rate from high temperature soak)
Heater Power 1,500 Watts (at 208 V input)


Temperature Controller Watlow F4 Controller with RS-232 interface, LED readout of temperature, LCD display of other parameters (standard).
Watlow F4T Touch Screen Controller with RS-232, Ethernet interface, 4.3" color graphic touch screen (optional).
Limit Controller Independent high and low temperature limits. Triggers an audible alarm and shuts down the chamber. Relay contacts provide a safety power interlock for test sample.

Input Power Requirements

Input Voltage 208 V -5/+10%, 1 PH, or 230 V ±10%, Single Phase, 60 Hz
Max Current Draw 25 A; Required Service 30 A
Power Cord and Plug Power cord, 14-feet, with a molded NEMA L6-30P plug
Operation at 50 Hz requires internal transformer option TE-0725. Cooling performance is reduced 17% at 50 Hz.

Physical Characteristics and Safety

Inside Dimensions 22"W x 18"H x 18"D (4 cubic feet)
Outside Dimensions 30"W x 64"H x 42"D (nominal)
Door latch adds 3" to width on right side.
Minimum Installed Clearance 18" from the left and right side
24" from the rear
Window Viewing Area 13.5"W x 11.5"H
Access Ports 4" Port on left and right side (two total)
Supplied with silicone foam plugs
Weight Chamber Weight: 700 pounds
Shipping Weight: 809 pounds
Sound Level 62 dBA in cooling mode (A-weighted, measured 36" from the front surface, 63" from the floor, in a free-standing environment)

NOTE: Performance is typical and based on operation at 23°C (73°F) ambient and nominal input voltage. Designed for use in a normal conditioned laboratory. Operation at higher ambient temperatures may result in decreased cooling performance. Additional ports and shelves will also affect performance. Operation above 30°C (85°F) or below 16°C (60°F) ambient is not recommended. Performance is reduced by 17% at 50 Hz input power.

Due to continuous product development, specifications are subject to change without notice.