SSI Technologies – Application Note PS-AN5
MediaGauge™ (Model MGA-9V) Digital Pressure Gage
Product Overview
Product Description
The MediaGauge™ Model MGA-9V is a NEMA 4X rated
stand alone 9V battery operated multi-functional digital
pressure gage. The MGA-9V digital pressure gage consists
of a piezoresistive pressure sensing element, signal
conditioning circuitry for temperature and calibration
compensation, a 304L stainless steel pressure port and a
LCD back lit display. The MGA-9V is a lower cost digital
pressure gage in the MediaGauge™ family with accuracy
of
± 1.0 % full scale
for dry air and non-corrosive gas
applications only.
The MediaGauge™ MGA-9V comes standard with a variety
of keypad operated functions – multiple pressure unit
display reading (PSI, BAR or MPA); memory storage of
maximum peak pressure reading; and zero adjustment.
The MGA-9V digital pressure gage has better accuracy,
longer life and
standard
multiple functions which make it a
better choice than mechanical pressure gages. These
compact 2 ½ inch, robust gages measure pressures from
30 PSI to 300 PSI.
MediaGauge™
Model MGA-9V with rubber boot option
Typical Applications:
Process Control; Compressors
NIST traceable certificates available
NEMA 4X Rating
Chemical Compatibilities:
Non-corrosive gases and
dry air
LCD Display Battery Saver Mode:
MGA-9V
automatically powers down after 3 minutes.
Product Features
Multiple Pressure Units:
PSI, BAR, MPA
(kg/cm²)
Compact, Robust Package:
2 ½ inches with black
ABS Thermoplastic case
Accuracy:
± 1.0 % Full Scale
Pressure Ranges:
30, 100, 300 PSI
Keypad Operated Functions:
Auto zero and peak hold
Operating Temperature:
-10°C to 60°C
Storage Temperature:
-20°C to 85°C
SSI TECHNOLOGIES, INC.
Controls Division
1309 Plainfield Ave.
Janesville, WI 53545-0450
Phone: (608)758-1500
Fax: (608)758-2491
www.ssitechnologies.com
Copyright August 30, 2012
SSI Technologies Inc.
All Rights Reserved
Revision 3
1
SSI Technologies – Application Note PS-AN5
MediaGauge™ (Model MGA-9V) Digital Pressure Gage
Product Overview
Measurement Technology
In general, pressure measurement technology translates a
force from an induced pressure into an electrical quantity. In
digital pressure gages, the electrical quantity is then
translated into pressure units and digitally displayed.
The SSI’s MediaGauge™ MGA-9V digital pressure gage
includes an 304L stainless steel input pressure port, a
piezoresistive pressure sensing element, signal conditioning
circuitry for temperature and calibration compensation, and
a LCD that displays the pressure measured in either PSI,
BAR or MPA (kg/cm²) units.
The piezoresistive sensing element contains a silicon
crystal semiconductor. Strain gages (resistive elements) in
the silicon are used in a Wheatstone Bridge circuit. When
pressure is applied, the resistivity of the strain gages
changes proportional to the pressure applied. One leg of
the bridge measures the input pressures port.
The other
leg of the bridge is connected to the reference port (vacuum
pressure 0 PSI) the input pressure port is compared to.
Since piezoresistive pressure sensors are sensitive to
changes in temperature, the MediaGauge™ uses signal
conditioning to compensate for temperature and calibration.
The output signal is then converted into one of 3 user
selectable forms (select units with the ON/UNIT/OFF
button):
1) PSI
2) BAR
3) MPA (kg/cm²)
To power on the unit:
Press the ON/UNIT/OFF button. The
MediaGauge™ MGA-9V has a battery saver mode and will
automatically shut itself off after 5 minutes.
To display the pressure reading in a different pressure unit:
Continue to press the ON/UNIT/OFF button until the arrow
in the LCD points to the pressure units desired.
To manually power down the unit:
Press the ON/UNIT/OFF
button and hold down for 3 seconds until OFF is displayed
and then release the button.
The
The MediaGauge™ MGA-9V will display the pressure
reading after the ON/UNIT/OFF button is depressed. The
pressure measurement reading is updated 3 times per
second.
MediaGauge™ MGA-9V Panel
The MediaGauge™ MGA-9V panel has a LCD display and
three multi-functional buttons – ON/UNIT/OFF; LIGHT/P-H
(Peak-Held) and RESET/CLEAR.
The
ON/UNIT/OFF button
is used to display the
pressure reading; switch between pressure units (PSI; BAR;
and MPA) and to power down the unit.
LIGHT/P-H (Peak-Held) button
is used to turn the
LCD LIGHT on/off and to display the maximum peak
pressure the unit has measured.
To turn the LCD LIGHT on:
Press the LIGHT/P-H button
once.
To turn the LCD LIGHT off:
again.
Press the LIGHT/P-H button
SSI TECHNOLOGIES, INC.
Controls Division
1309 Plainfield Ave.
Janesville, WI 53545-0450
Phone: (608)758-1500
Fax: (608)758-2491
www.ssitechnologies.com
Copyright August 30, 2012
SSI Technologies Inc.
All Rights Reserved
Revision 3
2
SSI Technologies – Application Note PS-AN5
MediaGauge™ (Model MGA-9V) Digital Pressure Gage
Product Overview
To see the maximum peak pressure the unit has measured:
Press and hold down the LIGHT/P-H button for 3 seconds.
The maximum pressure reading will be blinking.
If the
maximum pressure read was over the unit’s maximum
pressure range, o.L will be blinking on the display.
To return to the current pressure reading:
Press the
LIGHT/P-H button and hold down for 3 seconds.
The
Installation/Mounting
1)
Mount the MediaGauge™ MGA-9V digital pressure
gage on a suitable (1/4” NPT) female fitting.
Teflon tape or pipe dope to seal the threads.
2) Do no over tighten. Torque to 150 in lbs +/- 1 in lb.
Use
RESET/CLEAR button
is used to reset the gage to
Electrical Specifications
whatever pressure is currently being applied to the port and
to clear the stored maximum peak pressure reading.
Supply Voltage
9V Battery
< 1 ms
±1.0 FS
0.01
0.1
3 X Full Scale
10 X Full Scale or 15,000
psi whichever is less
Operating Temperature Range
Storage Temperature Range
-10° to 60°C (14° to 140°F)
-20° to 85°C (-4°to 185°F)
To reference your MediaGauge™ digital pressure gage to the
input port:
Press and hold the RESET/CLEAR button for 3
seconds.
The MediaGauge™ MGA-9V will now be
reference to your input port. For example, if you have 20
psi on the display and then you press and hold the
RESET/CLEAR button for 3 seconds the display will show
0.0 psi. A measurement of 30 psi would then read as 10 psi
on the display.
To reset the MediaGauge™ digital pressure gage:
Make sure
the input port is either disconnected or connected to a 0 psi
input. Press and hold down the RESET/CLEAR button for 3
seconds.
To clear the maximum peak pressure reading:
Press and hold
down the LIGHT/P-H button for 3 seconds until the
maximum pressure reading appears on the LCD (it will be
blinking). Release the LIGHT/P-H button. Press and hold
down RESET/CLEAR button for 3 seconds.
Burst Pressure
LCD Resolution (100; 300 PSI)
Proof Pressure
Response Time
Accuracy
LCD Resolution (30 PSI)
SSI TECHNOLOGIES, INC.
Controls Division
1309 Plainfield Ave.
Janesville, WI 53545-0450
Phone: (608)758-1500
Fax: (608)758-2491
www.ssitechnologies.com
Copyright August 30, 2012
SSI Technologies Inc.
All Rights Reserved
Revision 3
3
SSI Technologies – Application Note PS-AN5
MediaGauge™ (Model MGA-9V) Digital Pressure Gage
Product Overview
Tested Conditions
Humidity
Pressure/Temperature
Cycles
Thermal Shock
250 Hours (40°C and 90% to 95% R.H.
> 1.8 million Cycles (0 to FS @ 8Hz and
-20° to 85°C)
250 Cycles (85 to -20°C. 0.5 hr soaks at
temperature
Vibration
144 Hours (100 to 2000 Hz, 20g
sinusoidal in 3 axes)
MediaGauge™ MGA-9V with 22mm Hex and 1/4" - 18 NPT Process Connection
SSI TECHNOLOGIES, INC.
Controls Division
1309 Plainfield Ave.
Janesville, WI 53545-0450
Phone: (608)758-1500
Fax: (608)758-2491
www.ssitechnologies.com
Copyright August 30, 2012
SSI Technologies Inc.
All Rights Reserved
Revision 3
4
SSI Technologies – Application Note PS-AN5
MediaGauge™ (Model MGA-9V) Digital Pressure Gage
Product Overview
Digital Pressure Gage Ordering System
The following explains SSI’s MediaGauge™ Digital Pressure gage order number sequence.
Example
MGA -
300
- A
-
9V
Product Family
Pressure Ranges
Port Configuration
Connector
•
MGA
•
30
•
100
•
300
•
Hex
A 22mm
Port
1/4 - 18 NPT
•
9V
Battery, Operated
Rubber Boot Options:
Order P/N 24610.1 for Model MGA
SSI TECHNOLOGIES, INC.
Controls Division
1309 Plainfield Ave.
Janesville, WI 53545-0450
Phone: (608)758-1500
Fax: (608)758-2491
www.ssitechnologies.com
Copyright August 30, 2012
SSI Technologies Inc.
All Rights Reserved
Revision 3
5
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