Derui Constant Temperature and Humidity Chamber, Stable Operation in Laboratory
This 50-second video shows DERUI temperature and humidity test chambers running running in a laboratory — several chambers standing side by side, with bench power supplies feeding cables into the chambers so the products under test stay energised through the cycle. The chambers belong to the environment test chamber range. As the presenter moves past the chambers, the point being made is continuity: another one has been running continuously.
What This Temperature and Humidity Chamber Video Shows
The chambers and how they are set up
▸ Several temperature and humidity chambers standing side by side, each with its own controller display and lit chamber window
▸ Bench power supplies on stands beside the chambers, with cable runs going into the chamber so the products under test stay powered during the cycle
▸ The presenter notes that another chamber has been running continuously
Why continuous operation is the point
▸ A climate chamber is normally bought for a test plan that runs for days or weeks, not for a single afternoon
▸ A long run puts the load on the refrigeration circuit, the humidity system and the water supply rather than on the controller
▸ So the questions worth asking before ordering are about duty and service, not only about the printed temperature range
What the control system does
▸ Balanced temperature and humidity control (BTHC) with PID adjustment
▸ Programmable LCD touch screen with fixed running and pattern running modes
▸ Multi-step profiles can be stored in the controller, so an unattended run follows the same sequence every time
How a Temperature and Humidity Test Cycle Runs
Step 1 - Load the specimen
Place the specimen in the chamber with clearance on all sides, and bring the power and signal cables in through the test port if it has to stay energised.
Step 2 - Enter the profile
Set the temperature and humidity steps, the ramp rates and the dwell times on the touch screen controller, then store the pattern for repeat runs.
Step 3 - Hold the conditions
The BTHC system balances heating, cooling, humidification and dehumidification so the setpoint is held instead of being switched on and off.
Step 4 - Review the record
Read the run back from the controller display, or log it through the RS-232 output when the test has to be documented afterwards.
Temperature and Humidity Test Chamber Specifications
| Parameter | Specification | Selection note |
|---|---|---|
| Model | DR-H201-100 / DR-H201-150 / DR-H201-225 / DR-H201-408 / DR-H201-1000 | Confirm the model and the final configuration on the quotation. |
| Internal volume | 100 L / 150 L / 225 L / 408 L / 1000 L | Size the chamber around the specimen plus its fixture and the clearance the standard requires. |
| Temperature range | −20 °C, −40 °C or −70 °C to 150 °C | The low-temperature limit is set by the compression stage chosen; pick the variant that covers the coldest step in the plan. |
| Humidity range | 20% to 98% RH | State the lowest humidity you need at the low-temperature point, not only the range. |
| Control method | Balanced temperature and humidity control (BTHC) with PID adjustment | Balance control is what keeps humidity regulated at low temperature instead of hunting. |
| Temperature accuracy and fluctuation | 0.01 °C display accuracy; ≤ ±0.5 °C fluctuation | The fluctuation figure is quoted without load and with the temperature stable. |
| Humidity accuracy and fluctuation | 0.1% RH display accuracy; ≤ ±2.5% RH fluctuation | Humidity tolerance widens below 75% RH — check it against your test standard. |
| Temperature uniformity | ≤ 1.5 °C | Measured without load, at 50 mm or more from the sensor. |
| Heating and cooling rate | 3 °C/min heating, 1 °C/min cooling, average | Check the ramp against the standard you are testing to; rates are averages, not the peak of a curve. |
| Chamber material and water supply | Stainless steel 304 interior; painted stainless steel exterior; circulating water, 25 L tank (two tanks above 800 L internal volume) | Plan the water top-up interval if the chamber runs for weeks. |
Where This Chamber Is Used
▸ Electronics, electrical appliances and telecommunications equipment
▸ Automotive parts and components tested under a temperature and humidity profile
▸ Plastics, coatings and construction materials
▸ Metallurgy, chemical engineering and food science laboratories
What a Continuous Run Depends On
The parts that carry a long run are the refrigeration circuit, the humidity system and the water supply. Depending on the low-temperature variant, the chamber uses single-stage or two-stage compression, with the compressor set supplied according to the configuration ordered. The chamber interior is stainless steel 304, and the exterior is stainless steel with a protective paint coating.
Water is supplied as a circulating system: one 25 L tank for chambers below 800 L internal volume, and two 25 L tanks above that. For a chamber that runs for weeks, the top-up interval, the clearance around an air-cooled condenser and the power feed are installation questions rather than afterthoughts.
What to Check Before Running the Chamber Continuously
▸ Power supply: single phase 220 V for the 100 L and 150 L models, three phase 380 V for the 225 L, 408 L and 1000 L models
▸ Air flow: the condenser is air-cooled, so leave clearance around the machine rather than pushing it against a wall
▸ Water: circulating supply with the tank capacity for your model, and a routine for topping up during a long run
▸ Access: check the external dimensions against the doorway and the route into the test room before delivery
▸ Records: use the RS-232 output to log a run that has to be documented, with USB available as an option
What Information Is Needed for a Quotation
▸ Specimen type, dimensions and mass, and whether it has to be powered inside the chamber
▸ Test standard and the temperature and humidity profile, including ramp rates and dwell times
▸ The humidity you need at each temperature setpoint, not the overall range alone
▸ Site conditions: voltage, ambient conditions and whether the chamber runs continuously or intermittently
▸ Delivery terms and destination port, and whether installation and commissioning are required
Frequently Asked Questions
Video Summary
This 50-second video is a look at temperature and humidity chambers in operation rather than a specification sheet: several chambers running side by side, specimens kept energised through external power supplies, and one chamber that has been running continuously. The selection question behind it is the one worth asking before quotations are compared — not only what the chamber can reach, but what it takes to keep it running.
For the DR-H201 series, the published range runs from 100 L to 1000 L with a 20% to 98% RH humidity range and a temperature range down to −70 °C depending on the variant ordered. Send the test profile and the specimen details, and the model and configuration can be confirmed in writing.
Need a Temperature and Humidity Test Chamber Proposal?
Send the test standard, the specimen size and your site conditions through the contact page, and we will confirm the model and configuration for your application.
