ENMET PID-Guard User Manual
Page 8
PID-G
UARD
ENMET Corporation
6
3.2 Wiring the PID-G
UARD
The electrical installation should conform to appropriate electrical codes, such as the National Electrical Code in the United
States.
W
ARNING
:
The compliance of the installation to appropriate codes is not
ENMET
’s responsibility.
The
PID-G
UARD
should be powered through circuit breakers provided for this purpose.
3.2.1 Air Supply
Tap the pipe or tank containing the air and use appropriate fittings to connect the sample input hose. The instrument is
designed to operate from an air supply pressure 55
PSIG
. The sample input hose length should be as short as possible.
3.2.2 Power Supply
The input power can vary from 100 to 240
V
AC
, 50/60 Hz. Power should be connected to the Power Input Terminal
TB1
and
the Ground screw. See Figure 4 for location.
W
ARNING
:
Continuous gas detection and alarm systems (110
V
AC
/220
V
AC
/ 24
V
DC
/
12
V
DC
powered) become inoperative
upon loss of primary power. Contact factory for specifications and pricing of backup battery systems.
Upon supplying air and power to the
PID-G
UARD
:
The green power on LED is lit.
The display backlight is lit, and instrument will step through a start-up sequence: unit serial number and software revision
may be shown on the display.
The instrument may go into alarm briefly, but the sensors stabilize quickly. If the instrument persists in alarm, acknowledge the
alarm by pressing the
S
ELECT
button. If alarm persists longer than 30 minutes, call
ENMET
customer service personnel.
For DC wiring 24Vdc may be wired to J12, (J12-1)position 1 + with ground connected to (J12-2)position 2.
AC Power Supply Terminal: TB1
Label on PCB
Function
110
V
AC
TB1 ACN
Neutral
TB1 ACL
Line
Ground
Screw
AC GND
220
V
AC
TB1 ACN
Neutral
Optional
TB1 ACL
Line
Ground
Screw
AC GND
DC Power Supply Terminal: J12
Position
Function
1 +
24
V
DC
power
2
GND
3
4 - 20 mA out
Figure 4: Power Terminal Connections PID-G
UARD
Cover Inside View
Opened Upward
Attached to Base