10
Figure 3. PT920-8FG Connection board with
8 PT920 Series control modules installed
LEL
H2S
+
+
AC IN
G
N
L
E
C
H
−1
−
E
+
C
H
−2
−
−
C
H
−5
E
E
+
−
C
H
−6
+
DC IN
−
PEM−TECH, INC.
HOUSTON, TX
PEM−TECH, INC.
HOUSTON, TX
C
H
−4
−
+
−
C
H
−3
E
E
+
C
−
C
H
−8
C
H
−7
−
+
E
E
NC
C
NO
NC
+
NO
PEM−TECH, INC.
HOUSTON, TX
PEM−TECH, INC.
HOUSTON, TX
PEM−TECH, INC.
HOUSTON, TX
NO
NC
C
H
IG
H
C
LO
W
H
2S
H
I−H
I
F
A
IL
LO
W
L
E
L
NC
C
NO
NC
NO
PEM−TECH, INC.
HOUSTON, TX
PEM−TECH, INC.
HOUSTON, TX
PEM−TECH, INC.
HOUSTON, TX
CHANNEL 6
LEL MONITOR
MODEL PT 920
CHANNEL 3
H2S MONITOR
MODEL PT 920
ALARMS
NORMAL
BYPASS
RESET
MALF
HI−HI
HIGH
NORMAL
ALARMS
BYPASS
RESET
HI−HI
MALF
HIGH
CHANNEL 1
PPM H2S
LOW
H2S MONITOR
MODEL PT 920
PPM H2S
LOW
CHANNEL 2
H2S MONITOR
MODEL PT 920
NORMAL
ALARMS
BYPASS
NORMAL
ALARMS
BYPASS
RESET
RESET
MALF
HI−HI
HIGH
MALF
HI−HI
HIGH
RESET
NORMAL
ALARMS
BYPASS
HI−HI
MALF
HIGH
CHANNEL 4
H2S MONITOR
MODEL PT 920
LOW
PPM H2S
PPM H2S
LOW
% LEL
LOW
CHANNEL 5
LEL MONITOR
MODEL PT 920
POWER
O
1
GAS MONITOR
MODEL PT920−8FG
HOUSTON, TEXAS
NORMAL
ALARMS
BYPASS
RESET
NORMAL
ALARMS
BYPASS
RESET
MALF
HI−HI
HIGH
MALF
HI−HI
HIGH
NORMAL
ALARMS
BYPASS
RESET
MALF
HI−HI
HIGH
CHANNEL 7
LEL MONITOR
MODEL PT 920
LOW
% LEL
% LEL
LOW
% LEL
LOW
CHANNEL 8
LEL MONITOR
MODEL PT 920
RESET
ALARM
MASTER ALARM
RESET SWITCH
AC POWER SWITCH
JUMPER SELECTION FOR
H2S / LEL CONTROL MODULE
24 VDC POWER IN
AC POWER IN
RELAY CONTACTS 10A EACH
LOW − H2S
LOW − LEL &
HIGH COMMON
SENSOR INPUTS
CH1 THRU CH8
HIGH−HIGH ALARM &
SENSOR FAIL
RELAY CONTACTS.
RELAY RATINGS 5 AMPS
