Owner's Manual

GDX-350 Sensor Transmitter
6 P/N: 5600-9001 Rev 2
1.2. RF Wireless Networks
IMPORTANT: This section describes GDX-350 RF toxic / oxygen monitors equipped with
the RF Wireless Interface and RF firmware. This battery powered device has no external
power or signal wiring and is limited to self powered electrochemical sensors for toxic and
oxygen measurements. Gas values are displayed in their engineering units as well as
graphically as bar graphs or 30-minute trends. Flashing front panel LEDs notify personnel
when alarm levels have been reached. Periodic calibration checks are needed to assure
dependable performance.
The RF version of the GDX-350 functions on a license free 900MHz or 2.4GHz wireless Client / Server
networks and transmits monitored data to GDA-400 and GDA-1600 controllers. Controllers must be
equipped with the matching RF wireless modem and appropriate antenna to receive the transmissions.
Up to sixteen GDX-350 wireless monitors may communicate to one GDA-1600 and up to four to a GDA-
400. Wireless networks requiring more than 16 points may consist of multiple controllers.
Advanced microcontroller electronics and superior graphic LCD operator interface offers enhanced
diagnostics and fault analysis not possible in competing products. Non-volatile memory retains all
configuration data during power interruptions. The magnetic keypad allows non-intrusive calibrations be
performed by one person without opening the enclosure. A “real time clock & calendar” feature allows
logging of calibrations, alarm trips, communication faults and other events for review on the LCD readout.
Compatible sensors include an 8-wire Smart Sensor interface capable of configuration data uploads to
the monitor. Traditional Simple sensors without the smart interface are also supported. A separate PC
compatible USB Interface device allows Smart sensors to be loaded with configuration variables via a PC
and upload this data to the GDX-350. This configuration data includes alarm set points, range, target gas,
calibration constants and other variables required to match a specific application. For Simple sensors
without the smart interface, the USB device allows direct GDX-350 configuration from a PC.
Additional features include:
• On screen radio status icons indicate “Server In Range”, “Server Out of Range”, “Server
Previously Out of Range” and “Low Battery” conditions.
• No potentiometer or jumper settings required. All setup is with menus accessed via the LCD /
magnetic keypad operator interface without opening the enclosure.
• Field adjustable alarm levels flash front panel LED indicators for HIGH, WARN, FAIL conditions.
Alarm relays are not available with this low power model.
• CAL MODE provides on-screen prompts when to apply cal gas during calibrations.
• “Sensor life” bar-graph updates after each SPAN calibration indicating when to replace old
sensors.
• Half hour trend screen shows rate of change of gas exposures.
• Modular design affords efficient installation and plug in sensors allow changing target gases even
after installation.
• New smart sensors are recognized by the GDX-350 which prompts users to either upload new
configuration data or continue with data from the previous smart sensor.
• Missing sensors trip the FAIL alarm.
• Compatible sensors are industry proven for fast response and long life.