Product features: wet and dry bulb humidity measurement, enthalpy-humidity
diagram, simple operation.
Abstract: This article mainly introduces the application of coolmay
hmi/plc all-in-one machine in chick hatching, which achieves precise control of
temperature and humidity in the hatching room. It will alert you when
temperature or humidity is abnormal, and the parameter setting is simple.
1. Foreword:
The egg is very sensitive to the humidity and temperature of the
environment during the incubation process. Therefore, the controller needs to
be used to stabilize the temperature and humidity. The temperature measurement
is directly measured with high-precision thermal resistance. Calculate the
current humidity based on the difference between the dry and wet bulb
temperatures and the local atmospheric pressure, and use the humidifier and
heater to control the temperature and humidity. When the temperature and
humidity are too low or too high, an alarm will be issued. The controller can
also detect the exhaust fan , and it will also alarm if the exhaust fan stops
rotating or the speed is too low.
2. Description
The incubator uses Coolmay
EX3G-43H-24MT-2AD-NTC10K as a controller. After calibrating the two channels of
temperature in a dry environment, one of the two temperature probes is placed
in a wet cotton swab wet with water to form a wet and dry state. Ball
measurement system, the customer inputs the local atmospheric pressure to the
PLC, and calculates the relative humidity using the Hyland-Wexler equation
based on the atmospheric pressure and the temperature difference between the
wet and dry bulbs. The heater controls the ambient temperature, the humidifier
controls the ambient humidity, and the temperature and humidity have alarm
upper and lower alarm limits. When the range is exceeded, an alarm is issued to
remind the administrator. The controller also uses a photoelectric sensor to
measure the speed of the exhaust fan. An alarm is issued when the fan is below
the minimum speed. Due to the small space of the incubation room, it is
required that the overall volume of the control cabinet is small. The control
cabinet will be placed on the top of the incubator. The current temperature and
humidity will be displayed on the HMI panel.
Hyland-Wexler equation
Humidity chart
3. Operation interface and program
On Temperature standby interface, real-time display: dry bulb temperature,
wet bulb temperature and relative humidity in the incubator
The working interface of the incubator can be retrieved to view the
temperature and humidity record curve, and supports different language .
Alarm detection part about temperature and humidity in PLC program.
4.Application: Incubator using coolmay HMI/PLC all-in-one:
