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)
Air Flow 450 cfm


Temperature Controller Watlow F4T Touch Screen Controller with RS-232, Ethernet interface, 4.3" color graphic touch screen, OR...
Watlow F4 Controller with RS-232 interface, LED readout of temperature, LCD display of other parameters.
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.