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TestEquity LLC, Environmental Chamber Division Environmental Chambers for Temperature and Humidity Testing
   TestEquity Model 123H Temperature/Humidity Chamber - Specifications

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Temperature Range -68C to +175C
Control Tolerance 0.5C (Measured at the control sensor after stabilization)
Uniformity 1C (Variations throughout the chamber after stabilization)
Humidity Range



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

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

Temp/Humidity Range

Control Tolerance ±3% RH
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 -40°C -55°C -65°C -68°C
+23°C ----- 6 min 31 min 51 min 68 min Ultimate
+50°C 7 min 16 min 44 min 62 min 82 min Ultimate
+85°C 18 min 28 min 54 min 82 min 101 min Ultimate
+150°C 43 min 54 min 87 min 108 min 129 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 1.5 min 3.5 min 13 min 20 min 23 min Ultimate
-40°C 9 min 16 min 25 min 39 min 48 min Ultimate
-55°C 14 min 18 min 31 min 44 min 53 min Ultimate
-65°C 15 min 21 min 32 min 45 min 54 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 / 54 min = 2.3°C/min.
Heat Up Example: From -40°C to +85°C = 125 °C / 25 min = 5.0 °C/min.

*Note: Transition times are measured after a 2 hour soak at the respective start temperature with an empty chamber. Measured with setpoint beyond the start and end temperatures. Does not include the effect of proportional band when approaching setpoint.

Live Load Capacity (uncontrolled humidity mode)
+23C 0C -40C -55C -65C
500 Watts 400 Watts 225 Watts 175 Watts 100 Watts

Refrigeration and Heating System

High Stage Refrigerant R-404A (Dupont HP-62)
Low Stage Refrigerant R-508B (Dupont SUVA-95)
Compressors 1/2 HP x 1/2 HP Tecumseh hermetic compressors in a cascade configuration.
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 (500 Watts when compressors are running)
Humidifier Heater Power 750 Watts


Temp/Humidity Controller

Watlow F4 Controller with RS-232 interface, LED readout of temperature, LCD display of humidity and 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.
Chart Recorder   (Optional) Honeywell DR4300 Series. Two pen, 10" circular chart. Mounts in lower front door.

Input Power Requirements

Input Voltage

120 V nominal (110 to 126 VAC), 60 Hz, 1 PH
Max Current Draw 18 A, Recommended Minimum Service 20 A
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.
NEMA 5-20R

Humidity Water Requirements

Supply and Drain

Must be provided with a water line and floor drain or optional Water Recirculation System. 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: 600 pounds
Shipping Weight: 700 pounds
Sound Level 62 dBA in cooling mode (A-weighted, measured 3" from the front or side surface, 63" from the floor, in a free-standing environment)

NOTE: Performance is typical and based on operation at 23C (73F) 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 30C (85F) or below 16C (60F) ambient is not recommended.

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

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