Alarm Signal Summary; Pre-Set Alarm Limits & Calibration Concentrations; Testing The Alarms; Display Backlight - WatchGas NEO User Manual

User Manual

5.6.1 ALARM SIGNAL SUMMARY

Message
HIGH
OVR
MAX
LOW
TWA
STEL
Pump icon flashes
Lamp
Battery icon flashes
CAL
NEG
5.6.2 PRE-SET ALARM LIMITS & CALIBRATION CONCENTRATIONS
The instrument is factory calibrated with standard calibration gas, and is programmed with default
alarm limits. For example, on the NEO PPM, the default values are:
Cal Gas Cal Span
Isobutylene 10
A 3-point calibration is done:
1. At 0 ppm in 99.99% vol N
2. At concentration 10 ppm isobutylene
3. At concentration 100 ppm isobutylene

5.6.3 TESTING THE ALARMS

The alarm can be tested whenever the readout screen is shown. Press
alarms are tested.

5.7 DISPLAY BACKLIGHT

The LCD display is fitted with LED illumination to improve readability in poor lighting conditions.
Illumination turns on automatically in poor light. The settings for display illumination can be changed
in Config Mode or through WatchGas Suite.

5.8 DATA LOGGING

By default, the instrument stores the detected concentration every 60 seconds.
The datalog icon is displayed when datalogging is on.
A 60 second interval allows for up to a year of data storage. The data is stored in non-volatile memory
for download to a PC. The data is retained, even when the instrument is turned off or the battery is
removed.
Data is organised in events, with a new event created each time the instrument is turned on, a
configuration parameter is changed or datalogging is interrupted. Every event includes User ID, Site ID,
serial number, last calibration date and the alarm limits.
NEO Photoionization Detector
Condition
Gas exceeds 'High Alarm' limit
Gas exceeds measurement range
Gas exceeds electronics' maximum range
Gas exceeds 'Low Alarm' limit
Gas exceeds 'TWA' limit
Gas exceeds 'STEL' limit
Pump stall
PID lamp off
Low battery
Calibration failed, or is overdue
Calibration error results in a negative
reading
Unit Low
ppm 50
2
9
Alarm Signal
3 beeps/flashes per second
3 beeps/flashes per second
3 beeps/flashes per second
2 beeps/flashes per second
1 beep/flash per second
1 beep/flash per second
3 beeps/flashes per second
3 beeps/flashes per second plus 'Lamp'
message
1 flash, 1 beep per minute plus battery icon
flashes
1 beep/flash per second
1 beep/flash per second
High TWA
100 10
, and the audible and visible
OK
Ent Esc
D e t e c t i o n D e t e c t i o n
STEL
25
www.watchgas.eu