GDS Corp.
2513 Hwy 646
Santa Fe, Texas 77510
(409) 927-2980 (409) 927-4180 fax
www.gdscorp.com [email protected]
SPARE PARTS & ACCESSORIES
10-9060
Replacement PID Sensor (0-2000ppm)
10-9061
Replacement PID Sensor (0-20ppm)
10-906XR
Sensor Refurbishment for PID
10-0198
Sensor splash guard
10-0203
Sensor calibration cup
10-0205
Flow cell for process monitoring
10-0187
Sensor removal tool
1000-0078 Large
black
magnet
10-0232 Replacement
display
10-0233
Replacement I/O power supply
10-0234
Replacement Alarm / MODBUS
10-0250
Replacement isolated 4-20mA
If a
local
PID smart sensor is installed, the GASMAX II
will automatically identify the sensor type during
power-up and load the configuration parameters
stored in the sensor.
V. LOCAL SENSOR SETUP
Calibration should be performed at least once every
three months for PID sensors. In some cases, more
frequent calibration may be required due to
environmental considerations.
Attach a calibration cup to the sensor head and apply
a steady flow of “zero air” to the instrument for one
minute. Hold the magnetic wand over the “DN / CAL”
switch on the lower left side of the display until the
GASMAX enters calibration mode. Follow the on-
screen instructions to calibrate the GASMAX II unit.
If a remote PID sensor is installed, sensor information
must be entered manually.
ENABLE THE LEL/CURRENT CHANNEL
Press and hold the UP key for 5 seconds until the
“Enter Key Sequence” menu appears. Press the UP
key four times in sequence to access the XMITTER
CONFIG menu. Make sure the LEL/CURRENT
channel is ON. If an optional toxic sensor is also
installed (two-channel mode), make sure the O2/
TOXIC channel is also ON. Exit the XMITTER
CONFIG menu by pressing the NEXT key.
INITIALIZE THE GASMAX SOFTWARE
Press the EDIT key to display the Main Menu. Select
the Sensor Information menu entry and press EDIT.
Select INSTALL SENSOR and press EDIT to confirm.
Select Cat-Bead Input Type. This step deletes any
existing historical calibration data and resets sensor
life to 100%. Press NEXT to exit the menu.
SET SENSOR VOLTAGE
Press the EDIT key to display the Main Menu. Scroll
down to the TECHNICIAN ONLY entry and press
EDIT again. Press the UP key four times in sequence
to enter the TECHNICAN ONLY menu.
Select SET SENSOR VOLTAGE and adjust the
catalytic bead excitation voltage to 5.0V as measured
across the REMOTE SENSOR JUNCTION BOX
TERMINAL STRIP “A” and “R” terminals.
IMPORTANT: Do not exceed 5.5VDC across the
PID sensor at any time. Excess voltage can
damage the sensor and void the warranty,
VI. REMOTE SENSOR SETUP
Press NEXT to exit the TECHNICIAN ONLY menu (or
any menu).
For maximum accuracy, allow the sensor to warm
up for 24 hours BEFORE setting the balance and
preamp gain.
SET BALANCE
Attach a calibration cup to the sensor head and apply
“zero gas” to the sensor and wait one minute for the
reading to stabilize. Enter the TECHNICIAN ONLY
menu and select the SET BALANCE option. Adjust
the sensor output for a coarse zero. If the sensor is
working properly, the reading prior to setting zero
should be +/- 3% LEL.
PREAMP GAIN SET
Apply a specified “span gas” to the sensor and allow
the GASMAX reading to stabilize (~ 60 seconds).
Using the PreAmp Gain Set option, adjust the reading
to a value within 5% of the span gas value (coarse
adjustment only). Press NEXT to exit the menu.
VII. CALIBRATION
