1、 Overview

This series of cement (concrete) constant temperature and humidity curing boxes adopts an advanced intelligent temperature and humidity control system, which can accurately command functions such as heating, cooling, and humidification. Perform fully automatic switching to achieve dynamic balance of temperature and humidity inside the box, and can also install automatic timed printers and water level sensors. Thereby improving the accuracy and automation control level of temperature and humidity specified in standard curing conditions, reducing energy consumption, replacing existing low-grade standard curing boxes and non-standard curing rooms built by enterprises, and achieving standard environment for specimen state regulation and testing.

2、 Main technical parameters of cement concrete constant temperature and humidity curing box

1Temperature control accuracy ±1℃

2Temperature measurement accuracy ±0.5℃

3Temperature inside the box20℃

4Heating power600W

5Temperature difference ＜ ±1℃

6The overall noise of the machine is less than65dB

7Working voltage220V±10％

8Humidity control accuracy ±1％RH

9Relative humidity ≥92RH

10Humidity measurement accuracy ±3％RH

11Frequency50HZ

12Compressor power136W

13Temperature and humidity sensorPt100Alevel

14Volume: 20Btype550*600*580mm (Cement test block20group)

40Btype550*580*1160mm (Cement test block40group)

60Btype580*1200*1400mm (Concrete test block18group)

3、 Working principle

This instrument adopts precision platinum resistancePt100As a temperature sensing element, it is characterized by high performance（A／D）The converter will be transmitted by a multiplexer. The temperature and humidity equivalent voltage signals are converted into corresponding digital signals, which are then processed by a single-chip microprocessor for display and control. When the temperature is below the lower limit of the set temperature control value, the instrument outputs a heating control signal. When the temperature is above the upper limit of the set temperature control value, the instrument outputs a cooling control signal. When the temperature enters the window area of the set control value, the instrument outputs a cooling control signal（CERWhen setting the area, the instrument stops heating or cooling and enters a constant temperature state. When the humidity

When the humidity falls below the upper limit of the set humidity control value, the instrument outputs a humidification signal. When the humidity exceeds the lower limit of the set humidity control value, humidification stops

.

4、 Instructions for use

1The instrument should be placed in a ventilated and dry place at ambient temperature2~38℃,Relative humidity not exceeding85%,Indoor use without strong vibrations or strong electromagnetic fields around.

2After the instrument is placed steadily, check whether the door switch is flexible and whether the electrical, cooling and other components are damaged.

3Add water to the water tank inside the box until it is below the bottom shelf and above the electric heating tube2cmOpen the side door and fill the humidifier water tank with distilled water

Fill the plastic ball in the temperature measuring dry wet box with water and soak the gauze in the water.

4Insert the power plug into a well grounded device220VPress the power switch in the socket, and the instrument will automatically enter the working state.

5When leaving the factory, this instrument has been programmed with standard settings, and the temperature control value is20.0℃±1.0℃,The humidity control value is95%±1.5%,No special requirements,Cannot change the control program,Otherwise, temperature and humidity control may exceed the technical range. If it is necessary to change the control value data, the program can be modified according to the temperature controller manual.

5、 Instrument operating parameters (factory standard program settings)

1Temperature control value20.0℃2Temperature control upper limit (based on the control value)+1℃

3Humidity control value95％4Temperature control lower limit (based on the control value) -0.5℃

5Upper limit of humidity control (based on the control value)1％

6Lower limit of humidity control (based on the control value)1％

6、 Precautions

1If the voltage fluctuation of the power supply exceeds the specified range of use, a power stabilizer must be installed, otherwise it will damage the instrument and refrigeration unit.

2The power grounding must be reliable, as poor grounding can pose a danger to your personal safety.

3Regularly check the humidifier and water tank, do not cut off the water in the dry and wet box, and replace the gauze inside the box every month.

4Non relevant personnel are not allowed to change the control program data without authorization, in order to avoid instrument loss of control and damage.

7、 General troubleshooting

1The whole machine is not working: Check if the power switch and fuse are damaged.

2Not cooling: Check if the instrument displays the cooling status, check if the compressor overload protector and starter are damaged. If the compressor can operate normally but not cooling, it may be due to refrigerant leakage.

3Humidifier not humidifying: Check if the small fan inside the humidifier is working, if the water level inside the humidifier base is too high, if the humidifier is placed too tilted, and if the atomizing transducer is clean.

4Large temperature difference inside the box: Check if the fan is working. If the cooling indicator light is on but the fan is not working, the fan is damaged or the fuse is broken.

5Occasionally, due to the impact of external electrical signals, the instrument may lose control of its digital display. Simply turn off the power switch or unplug the power plug, and then restart it to work normally.