7
The calibration procedure is as follows:
1. Place the first material sample centered in front of the probe face.
2. Tap the pushbutton twice in succession within 1.0 second. The first sample is
taken and the indicator will flash amber at a 2.5 Hz rate for up to 25 seconds.
3. Within 25 seconds, place the second material sample centered in front of the
probe face.
4. Tap the pushbutton once more. The second sample is taken, the new threshold
installed, and the indicator flashes amber four times at a 5 Hz rate and then
reverts to following the outputs.
5. If 25 seconds elapses before the press of the calibration pushbutton, the
controller aborts calibration and re-installs the previous calibration values.
6. If the thickness of the two samples is too close for reliable gauging, the indicator
flashes amber at a 10 Hz rate for up to 15 seconds or until the pushbutton is
pressed again. After 15 seconds, it returns to the previous calibration settings.
OPERATION
As metal passes the sensor the LED multi-function indicator and the two outputs
respond as shown in the chart below:
Single
No-Double
Probe
Detects
Output Output LED
No
Metal
OFF
ON
OFF
Single Thickness
ON
ON
Green
Double
Thickness
OFF
OFF
Red
The DS71/DS72 controller constantly monitors the current draw of the attached probe.
If the measured current goes out of specification for whatever reason, the multi-function
indicator flashes red at a 10 Hz rate until the problem is corrected or the power is
removed.
The output logic is designed for fail-safe operation. If the controller looses power or an
output line is disconnected, the unit reports a double by default.
