SonaSwitch®
General
This operation and installation manual provides
general guidelines and suggestions to assist
you in using the SensComp, Inc. SonaSwitch®
MINI-S ultra-sonic sensor module in many
measurement applications.
General Installation Procedures
1. Always mount the SonaSwitch® MINI-S in a
suitable dry location. The SonaSwitch®
MINI-S is designed to be used in an indoor
or protected environment only. The
SonaSwitch® MINI-S E is suitable for
harsher environments and higher humidity
conditions. Excessive moisture on the
sensor will result in damage and improper
operation, and will void all warranties.
2. Mount the SonaSwitch® MINI-S as far off
the ground as practical.
3. Mount the SonaSwitch® MINI-S in a location
where environmental interference sources
are minimized (examples are EMI sources,
air nozzles, excessive air turbulence, etc.).
4. Mount the SonaSwitch® MINI-S in a 1.575
inch diameter hole, using RTV silicone or
edge clips to secure the sensor in place.
You can also use our enclosure PID#
619395, to house the SonaSwitch® MINI-S
5. As supplied, the SonaSwitch® MINI-S
should not need any adjustment as it has
been calibrated at the factory.
6. The two (2) NPN open collector digital out-
puts need to be “pulled up” (through a resis-
tance and/or impedance) to an external
positive power source of less than 40 VDC.
(Typically 4700 ohms when connected to an
ex5 VDC power source for testing or
for interfacing to TTL Logic level circuits).
The maximum output current is 600 mA.
The Range Set LEDs do not require pull-up
resistors, and can be used for setup
calibration before connecting the
SonaSwitch® MINI-S to external equipment.
System Wiring Information
Pin 1 – Power Supply – A +8 to +24 VDC
regulated power source supplying 30 mA of
current (2.0 Amperes during the 0.5 ms
transmit pulse).
Pin 2 – Power Supply Common (Ground) –
Common Return for DC power supply,
switched outputs, and clock signals.
Pin 3 – External Trigger – Accepts TTL com-
patible logic level clock signals. A low to
high (zero to +5 VDC) transition triggers
the SonaSwitch® MINI-S
Pin 4 – Trigger Enable – Allows the
SonaSwitch® MINI-S to accept an external
trigger signal. Enabled by connecting this
pin (pin 4) to common (pin 2).
Pin 5 – ECHO (PWM) Output – Delivers a TTL
compatible Pulse Width Modulated (PWM)
clock signal. This signal goes high at the
start of a cycle, and returns to a low state
when the returning echo is received.
Pin 6 – NPN Output 1 – This NPN open collector
output turns on and off when a target is
detected (on) or missing (off) as set by the
Range Set 1 push button.
Pin 7 – NPN Output 2 – This NPN open collector
output turns on and off when a target is
detected (on) or missing (off) as set by the
Range Set 2 push button.
Calibration Procedures
1. Apply DC power ( +8 to +24 VDC) to the
SonaSwitch® MINI-S (connector header
pins 1 and 2)
2. Allow five to ten minutes warm-up time for
the SonaSwitch® MINI-S to reach
operating temperature before calibrating
the unit.
3. If desired for testing, connect the two
NPN Open Collector Outputs to an
external positive power supply through
appropriate impedances. Since they are
open collector, they will always read zero
volts until connected to a pull-up load
(See General Installation Procedures –
Step 6).
4. NPN Output 1 Adjustment (pin 6)
Place the target at the desired
detection distance from the face of
the SonaSwitch® MINI-S.
Depress and hold the “Range Set 1”
push button switch. Wait for the
“Range Window” LED to flash three
times, followed by a “chirp” sound
from the sensor before releasing.
The NPN output 1 should now be set:
o
LED 1 ON – NPN output is a
Logic Low (0 VDC) when target
is detected.
o
LED 1 OFF – NPN output is a
