Owner's Manual

GDX-350 Sensor Transmitter
28 P/N: 5600-9001 Rev 2
3. INITIAL START-UP
3.1. Model Name
When power is applied to the GDX-350 it will briefly show a 10-digit ASCII model and company name
during start-up. The name can be edited in the Transmitter Configuration menu by editing the Model
field.
Figure 3-1 shows how to access the menu for setting the 10-digit ASCII model name which is displayed
briefly after power is applied to the GDX-350 (RF shown). To access from any data display, press and
hold the NEXT key for 5-seconds until the screen appears requesting a special key sequence (4-UP
keystrokes).
Figure 3-1: Transmitter Configuration Menu
3.2. Initial Toxic/Oxygen Sensor Monitor Start-Up
GDX-350 Toxic/Oxygen Monitors, which are factory equipped with a local Simple or Smart
electrochemical sensor, rarely require adjustments (other than routine calibrations) to provide accurate
readings. However, after installation the following check should be performed to ensure proper operation.
In addition, alarm levels, Measurement Name ASCII fields and other variables may require attention by
users in order to best serve their application.
3.3. Initial Toxic/Oxygen Sensor Monitor “Span” Check
Prior to the initial Routine Sensor Calibration described in Section 4.1 on page 29, a coarse SPAN gas
reading verification (or bump test) should be performed after installation. Apply an upscale gas value of
at least 25% of full scale to the sensor. For example, if 0-100 ppm H
2
S is the measurement range, apply
at least 25 ppm, but not more than 100 ppm. Remember that this is only a coarse check and precision
calibrations are performed in Routine Sensor Calibrations described in the following Section 4.1.