Vijay Enterprises MGA644 User manual

Digital Test Pressure Gauge
Data Logger MGA644

INTRODUCTION
The MGA 644 combines the high accuracy of digital electronics with the convenience
and ease of use of an analog test gauge. With accuracy of ± 0.075 % FS, the MGA
644 can be used as a calibration reference, or in applications where high accuracy
pressure measurement is required.
Many user congurable functions have been designed into the MGA 644 including
ZERO and MIN/MAX. Once the gauge is congured, settings can be locked and
password protected to prevent unauthorized changes to the conguration.
DISPLAY AND CONTROLS
Using this key you can toggle
through the different pressure
2
scales (Kg/cm , BAR, PSI, KPa,
In H g, In W c, mm H g, mm W c,
Pascal).The availability of scales
depends on the maximum range.
Turns the gauge 'ON'
or switches it 'OFF'.
ON
OFF
1
UNITS
CAL
2
ZERO
In open input condition this key will
set display to zero. The gauge enters
the “SWITCH TEST” mode when this
key is pressed for 4 seconds
3
This key displays MIN/MAX
pressure values. The gauge
enters “LEAK TEST” mode when
this k e y is pr e s sed f o r 4
seconds.
Min
Max
CLR
4
By this key gauge clears
previously stored min/max
values and returns to mA
DC. When pressed and held
for 4 seconds it will display
m i n / m a x v a l u e s
continously.This feature is
great for nding spikes in
the pressure systems & for
testing/setting pressure
switches.
Min
Max
DC mA
5
This key will take you to the
previous menu. If equipped
with data logging facility,
this key will send/print the
data.
ESC
PRINT
6

Storage : 20°C to + 70°C
Operating : 25°C to + 45°C
SPECIFICATION
Display
Accuracy
Power
Low Battery
Over Pressure Protection
Environmental
Pressure Connection
Housing
Graphic Display (128 x 64) with
backlight.
+
-
0.075 % FS
7.5 VDC internal alkaline battery
AA size (5X1.5) Pre installed
Battery Life 90 hours
Indicator is displayed near the end of
battery life
Types of Pressure & Media
Compatibility
Available Standard
Engineering Units
125 % of specied range
kg/cm2, bar, psi, kPa, inHg, in Wc,
mmHg, mmWc, mbar, Pascal
Refer resolution table for further details
¼ “ BSP Male (Other on request)
120mm (dia) x 65 mm (d), Aluminium
anodized, light weight
Gauge, Absolute and Compound
Non corrosive dry gases or liquid
compatible with SS 316 stainless steel

OPERATION OF SWITCH TEST FUNCTION
Connect the switch using connector supplied. Use white wires, one wire to COM and
other as required NO or NC apply pressure when switch state changes results are
automatically displayed.
SWITCH TEST
For switch set-up and fault nding the display
shows the output pressure and switch state
OPEN or CLOSED. Verify pressure switch
performance using automatic procedure. The
gauge displays switch points and hysteresis.
LEAK TEST
Leak test will check for pressure leaks prior to
calibration or during routine maintenance.
Pressure stabilization time is 60 seconds
(FIXED).Test time is 60 seconds (FIXED). Apply
pressure and wait. MGA 644 will report the START
and STOP pressure and change in pressure
during 60 seconds.
SETUP & CONFIGURATION
ŸSwitch on the gauge
ŸPress & hold the CAL key for 4 seconds.
PASSWORD 00000 (factory set password is
00000) displayed press enter key, Gauge will
enter in user-settable functions.
ŸThe user settable functions are as follows:
CALIBRATION, CHANGE PASWD, SYS SETTING.
Password
User Settable
Functions

CALIBRATION
ŸSelect CALIBRATION (in MENU mode) using
the ENTER key.
ŸCalibration adjustment of MGA 644 is
performed electronically via internal software
with case closed. There are no mechanical
adjustment all commands and adjustments
are done via the key pad using display to
guide the user through calibration procedure
A total of 15 steps for pressure
PRESSURE CALIBRATION
Pressure Calibration(Dead Weight source recommended):
ŸSelect the STEP.
2
ŸPressure to be applied will be displayed in kg/cm in upper line & the sensor
output in the second line.
2
ŸApply the pressure in kg/cm & see that the sensor output changes & becomes
steady.
ŸPress ENTER
ŸSelect next step & repeat the above procedure upto step 15. mA DC
Measurement Calibration(Good quality mA source
recommended)
ŸUse connector provided (+RED , -BLACK)
Applied
Pressure
Sensor
Output
Example of ‘Step 01’
ŸSelect MA LOW using the enter key.
ŸSource 0 mA (input can be left open) and
see that output becomes steady.
ŸPress ENTER
ŸSelect MA HIGH using the enter key.
ŸSource 20 mA and see that output changes
and becomes steady.
ŸPress ENTER
ŸCalibration is complete
ŸPress Esc to enter the ‘MENU’ mode.
ŸPress Esc to enter the ‘NORMAL’ functioning
mode.
ŸNow you can validate the calibration.
mA DC Calibration Steps

CHANGE PASSWORD
ŸSelect CHANGE PASSWORD (in MENU mode)
ŸPress ENTER
ŸEnter the new password using SHIFT and UP
key
ŸPress ENTER
ŸPress ESC, display will be in MENU mode
ŸPress ESC, gauge will be in NORMAL mode
New Password Display
SYSTEM SETTINGS
ŸSelect SYSTEM SETTING (in MENU mode)
ŸShown settings are displayed
ŸSelect SET DATE (in SYSTEM SETTING mode).
ŸEnter the DATE using SHIFT and UP key.
ŸPress ENTER.
SET DATE
SET TIME
ŸSelect SET TIME (in SYSTEM SETTING
mode).
ŸEnter the TIME using SHIFT and UP key.
ŸPress ENTER.

EVENT LOG
ŸSelect EVENT LOG (in SYSTEM SETTING
mode).
ŸSelect YES or NO.
ŸPress ENTER.
PRINT EVENT
ŸSelect EVENT LOG (in SYSTEM SETTING
mode).
ŸSelect YES or NO.
ŸPress ENTER.
EVENT TIME
ŸSelect EVENT TIME (in SYSTEM SETTING
mode).
ŸSelect required time using UP and DOWN key
ŸPress ENTER.
ERASE EVENT LOG
ŸSelect ERASE EVE LOG (in SYSTEM SETTING
mode)
ŸSelect YES or NO (selecting YES will erase all
data from memory)
ŸPress ENTER.
ŸPress ESC display will be in MENU mode
ŸPress ESC gauge will be in NORMAL mode
Severe injuries can occur through improper use of pressure instruments. Do not exceed recommend
pressure limits of tubing and ttings. Never disconnect pressure instrument without rst relieving the
system pressure. Never insert any object into the pressure connection. The sensor diaphragm is
very thin and will be damaged or destroyed by solid or sharp objects.
WARNING

Vijay Enterprises
A/202, Arihant Flats, Arihant Super Market,
Opp., SBI Lalbaug, Manjalpur,
Vadodara - 390011,
Gujarat,INDIA
Phone: [phone]
Mobile: [phone]
E-mail: [email protected]