Model 123HS Temperature/Humidity Chamber - Specifications


Temperature Range
-35°C to +175°C
Control Tolerance
±0.5°C (Short-term variations measured at the control sensor after stabilization)
±1°C (Variations throughout the chamber after stabilization)
Humidity Range

Standard Range: 10% to 95%
(Limited by a 6°C dewpoint and maximum dry bulb of +85°C)

With GN2 Purge or optional Dry Air Purge: 5% to 95%
(Dry bulb range of +10°C to +85°C)

Temp/Humidity Range

NOTE: Ability to reach RH extremes may be limited by the humidity sensor accuracy. Low Dew Point conditions can only be achieved when starting with a clean, dry chamber.

Control Tolerance
±3% RH (Short-term variations measured at the control sensor after stabilization)
Display Resolution
0.1% RH
Humidity Sensor
Dynamic capacitive type (no wet wicks required)
Cool Down Transition Time* (uncontrolled humidity mode)
Start Temp End Temp
+23°C 0°C -10°C -20°C -30°C -35°C
+23°C ----- 4 min 8 min 15 min 25 min Ultimate
+50°C 5 min 10 min 16 min 24 min 36 min Ultimate
+85°C 10 min 19 min 25 min 33 min 45 min Ultimate
+150°C 22 min 33 min 40 min 48 min 63 min Ultimate
Heat Up Transition Time* (uncontrolled humidity mode)
Start Temp End Temp
+23°C +50°C +85°C +125°C +150°C +175°C
+23°C ----- 2 min 12 min 24 min 33 min Ultimate
0°C 3 min 9 min 18 min 32 min 41 min Ultimate
-30°C 8 min 14 min 23 min 27 min 45 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 -20°C = 105°C / 33 min = 3.18°C/min.
Heat Up Example: From 0°C to +85°C = 85°C / 18 min = 4.72°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 on 123HS-EX 50 Hz export versions by 17%.

Live Load Capacity (uncontrolled humidity mode)
+23°C 0°C -10°C -20°C -30°C
500 Watts 400 Watts 300 Watts 200 Watts 100 Watts
Refrigeration and Heating System
Refrigerant R-404A (Dupont HP-62)
Compressor 1/2 HP Tecumseh hermetic compressor
Condenser Air Cooled
Heat of Rejection 5,000 BTUH (maximum rated chamber load at maximum cooling rate from high temperature soak)
Air Heater Power 1,000 Watts
Humidifier Heater Power 750 Watts
Temp/Humidity 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.
Chart Recorder (Optional) Honeywell DR4300 Series. Two pen, 10" circular chart. Mounts in lower front door. 24-hour rotation. DR4300Chart Recorder
Input Power Requirements
Input Voltage

123HS North America Version:
120 V nominal (110 to 126 VAC), 60 Hz, 1 PH
Max Current Draw 18 A, Recommended Minimum Service 20 A

123HS-EX Export Version:
230V nominal (220 to 240 VAC), 50 Hz, 1 PH
Max. Current Draw 9 A, Recommended Minimum Service 13 A
Performance is reduced by 17% with 50 Hz input power.

Power Cord
and Plug
6' Power cord supplied with a molded NEMA 5-20P plug. NEMA 5-20P Plug
Plugs into a standard NEMA 5-20R receptacle.
Use of an extension cord is not recommended.

Model 123HS-EX export version is supplied with power cord for the destination country.

Humidity Water Requirements
Supply and Drain Must be provided with a water line and floor drain. Negligible consumption.
Water Recirculation System (optional) Provides a reliable supply of filtered water for the humidity system. Perfect for installations where a water line and drain are not available.
Physical Characteristics
Inside Dimensions 18" W x 16.5" H x 13.5" D (2.3 cubic feet)
Outside Dimensions 26" W x 63" H x 36.5 " D (nominal)
Vent tube adds 3" to height.
Minimum Installed Clearance 6 " from the left and right side
12" from the rear
Window Viewing Area 7" W x 12 " H
Access Ports 4" Port on left and right side (two total)
Supplied with foam plugs
Weight Chamber Weight: 520 pounds
Shipping Weight: 635 pounds
Sound Level 58 dBA (A-weighted, measured 36" from the front)

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.

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