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SSI Technologies – Application Note PS-AN7
MediaGauge? (Model MG-MD) Digital Pressure Gauge
Product Overview
Example Using High & Low Set Points
The MediaGauge? MG-MD also has two keypad
programmable pressure set points – a low limit set point
and high limit set point. These set points control the limit
switch (NPN transistor output).
To understand the high and low pressure set points
functioning, let’s look at a typical application where the
MediaGauge? MG-MD in used in a monitor and control
system.
VCC
Limit Switch Operation
VCC
COM
In the graph shown here, you can see how the user can
1
Supply Source
(White)
program the high and low set points to control when the
relay would turn on and off.
2
4 - 20 mA OUT
(Blue)
Meter
Input pressure values below the low limit set point or higher
3
4
Switch Output
(Brown)
Ground
(Black)
RELAY
NO
NC
than the high limit set point will result in a limit switch output
(Brown Wire) of 0 Vdc.
Input pressure values within the control set point limits
MediaGauge ?
4 Pin Mini DIN
In the example shown above, the MediaGauge MG-MD is
attached to an external power supply, a current meter and a
relay. We will assume the low set point has been set to 100
psi and the high set point has been set to 375 psi.
SSI TECHNOLOGIES, INC.
Controls Division
2643 West Court Street
Janesville, WI 53548-5011
Phone: (608)758-1500
Fax: (608)758-2491
(between the low and high set point values) will result in a
limit switch output that follows the external power source.
Note: The 4-20 mA output (Blue Wire) is proportional to the
input pressure and operates independent of these low and
high set points.
Copyright January 30, 2009
SSI Technologies Inc.
All Rights Reserved
Revision 4
www.ssitechnologies.com
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