ENMET PID-Guard User Manual
Page 11
PID-G
UARD
ENMET Corporation
9
4.2 Normal Display Mode
When the
PID-G
UARD
is installed as described in section 3, and in clean air, the
POWER
green LED is on, the display is lit
and the information on the display is measurement of hydrocarbon detected by the
PID-G
UARD
.
The red alarm and fault LEDs
are not lit.
To advance through displays of operational information press the
M
ENU
button.
Example sequence of operational information below:
Display Measurement of Hydrocarbon
Press
M
ENU
button
Display indicates Alarm 1 Set point
Press
M
ENU
button
Display indicates Alarm 2 Set point
Press
M
ENU
button
Display indicates Alarm 3 Set point
Press
M
ENU
button
Display indicates mA Span range
(Full Scale)
Press
M
ENU
button
Display returns to Hydrocarbon measurent
Operational Display Flow Chart
4.2.1 Alarm Conditions
PID-G
UARD
There are three alarm set points for CO. The factory settings of these alarm set points are shown in Table 2.
Table 2: Factory Alarm Set Points
Gas
Alarm 1
Alarm 2
Alarm 3
Hydrocarbon
5
10
50
These alarm set points can be changed within limits; see the maintenance section of this manual for the procedure.
If the gas concentration increases above that of the alarm set point, the associated red LED is lit, the associated relay changes
state, and the audio alarm is activated.
Pressing the
S
ELECT
button can temporally disable the Audio Alarm. The horn will be disabled for about five minutes. If a
second alarm condition occurs during this time the horn will re-activate. If the alarm condition(s) have ended during this time
the horn will not re-activate.
4.3 Hydrocarbon Sensor Response
Hydrocarbon (HC) sensor is designed to detect hydrocarbon gases and vapors with an ionization potential (IP) of 10.6
eV
or
less. Hydrocarbons with an IP of greater then 10.6
eV
will NOT be detected. Please see Appendix A for a list of common
gases and vapors and their respective IP rating.
Unless otherwise noted Isobutylene is used as a calibration and reference gas.
0 ppm
A1:
05
S
ELECT
S
ELECT
M
ENU
M
ENU
A2:
10
S
ELECT
M
ENU
A3:
20
S
ELECT
M
ENU
mA:
50
S
ELECT
M
ENU