Air Pressure Sensor Zero Calibration and Parameter Check

In this article, we will explain:

● Why the air pressure sensor may need to be re-zeroed periodically.

● When the air pressure sensor may need to be re-calibrated.

● How to reset and calibrate three different sensor models.

1. Why Is Zero Calibration & Other Setting varification Necessary?

Air pressure sensors are sensitive electronic components that measure pressure based on very small internal signal changes.

During normal operation, factors such as:

● Ambient temperature changes

● Seasonal weather variations

● Altitude differences

● Long-term component drift

● Transportation and installation conditions

may cause the sensor's standby reading to gradually shift from its original zero point.

As a result, the displayed pressure value may show a small offset even when no air pressure is being applied.

This is a normal characteristic of pressure sensors and does not indicate a defect.

During normal machine operation, maintenance, or cleaning, some sensor settings may be accidentally changed. This can cause abnormal machine behavior, pressure alarms, or incorrect pressure readings.

Therefore, to maintain accurate pressure monitoring, we recommend periodically checking the sensor reading and performing a zero calibration whenever necessary.

2. When a Re-calibration is needed?

Normally, the air pressure detection threshold is set to 0.3 psi by default. If the detected air pressure drops below 0.3 psi while the laser is operating, the machine will stop and a warning message will appear on the control panel. This safety function helps ensure sufficient airflow to protect the lens from dust and debris and reduce the risk of the material catching fire due to insufficient airflow.

The air pressure sensor uses the 0.3 psi threshold to determine its output status. When the detected air pressure reaches or exceeds this threshold, the sensor outputs an OUT1 signal to the controller. Therefore, if the sensor detects a pressure above 0.3 psi even while the machine is in standby, OUT1 may remain continuously active.

In addition, the pressure detection threshold may be accidentally changed to a higher or lower value due to unintended operation. A continuously active OUT1 signal or an incorrect pressure threshold may result in abnormal signal output from the sensor, potentially interfering with the normal operation of the controller and causing the following issues:

Possible Symptoms	Images/Videos
1. When File is selected on the control panel, the screen remains stuck on “Loading...”
2. A file is successfully sent to the machine but does not appear on the control panel. The machine must be restarted before the file is displayed.
3. File parameters displayed on the control panel, such as the power value, may change randomly.
4. The X/Y/Z-axis coordinate values may become abnormal, and the IP address may change unexpectedly.
5. Sensors on the Diagnostics screen may be triggered randomly.
6. When the Auto Focus button on the control panel is pressed, the following message appears: “Z auto-focus function is not enabled. Please confirm!”
7. When the Frame button is pressed, the laser head will run the frame once. However, when the Frame button is pressed again, the laser head will not move.
8. After pressing the Start button on the control panel to begin processing, the processing progress remains at 0%.

If you experience any of these issues, please follow the steps in below form and/or the documents attached at the bottom, or the videos below to verify and restore the correct settings.

3. How to Re-calibrate the Air Pressure Sensor

Note: After entering the menu page (SET page), usually press SET (S) button to change pages, press Up or Down button to switch setting in a certain page, press and hold SET (S) button to enter or exit menu page. For details please check the attached documents at the bottom.

Note: Three different air pressure sensor models have been used across different production batches. Please identify the sensor installed on your machine by comparing it with the images below, then follow the corresponding setup video, instructions, and documentation for that model.

Before Calibration

Before performing zero calibration, please make sure:

1. The machine is powered on.

2. The sensor is in standby mode.

3. No air pressure is applied to the sensor.

Let's only perform the calibration when the sensor is under true zero-pressure conditions.

Besides, some sensors have lock and unlock feature to avoid accidenty press and change. Please unlock the sensor button for the check and reset. And please lock the buttons after all is done.

Air Pressure Sensor Zero and Parameter Setting Calibration Operation Video Tutorial

Pressure Sensor Model	Product Appearance	Calibration Video
SMC
AirTac
Yihda

Air Pressure Detector Settings	Yihd	Airtac	SMC
Model	WEW02-N-KHR	DPSN1-10020	ISE20-N-M-L
Lock&Unlock	Press and hold the SET key and ∨ keys simultaneously to lock or unlock	/	Press and hold the SET key for 6 seconds, ignoring the SET interface at 2 seconds and the F0 interface at 4 seconds (if present). After entering the oPE interface, press the ∧ or ∨ key to switch between UnL and LoC. Finally, press the SET key to confirm and exit.
Lock&Unlock		/
Clear the reading	Press and hold the ∧ and ∨ keys simultaneously for 5 seconds, under unlock state (if applicable).
Clear the reading
OUT1 Model	oUt1：EASY	ot1：EASY	oUt1：HYS	F1
OUT1 Model
OUT2 Model	oUt2：EASY	ot2：EASY	/
OUT2 Model			/
Output Status	nonC: 1o2o	noC: 1o2o	lot: 1_P	F1
Output Status
Output Response Time	rES: 100	SPd: 100	dt1: 100	F1，Set
Output Response Time
Output Color	Clor: G-on	Clr: G-on	CoL:1SoG	F1
Output Color
Air Pressure Unit	UnIt: PSI	Unt: PSi	Unit: PSi	F0
Air Pressure Unit
Set Pressure Detection Value (Short-press SET, then use ∧∨ keys to adjust)	P-1: 0.3	1-P: 0.3	P_1: 0.3	F1，Set

Set Pressure Detection Value (Short-press SET, then use ∧∨ keys to adjust)	P-2: 0.3	2-P: 0.3	H_1: 0.3	F1，Set