CM4 Four-Point Continuous Monitor
CM4 Technical Manual
2-2
2.1 Introduction
This section identifies:
• The control panel display, keypad, and LEDs (Section 2.2)
• Relays (
• Sample flow controls (
)
NOTE:
On newer style CM4 (S/N XXX-5000 and greater) and all CM4-P
models, the flow controls (item 6) are located on the lower
left of the front panel. An air filter (item 10) is located on the
lower right.
1
2
3
4
1
4
7
2
5
8
0
3
6
9
MON
ITOR
STATU
S ALA
RM
!
LOCA
TIO
N
PROG
RAM
RESE
T
ENTE
R
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2
1
4
10
7
8
5
1
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1
4
7
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5
8
0
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6
9
MO
NIT
OR
STA
TUS
ALA
RM
!
LOC
ATIO
N
PRO
GRA
M
RES
ET
ENT
ER
Table Mount
Wall Mount
9
6
Figure 2-1: CM4 Components and Controls
Legend
1
Tape load lever
6
Flow controls
2
20-character display
7
Keypad
3
Alarm relays
8
Filter block
4
Detectors and electronics
9
Carrier
5
Status and alarm LEDs
10
Air filter
2.2 Control Panel
The front control panel consists of:
• Display (1)
• Status and alarm LEDs and point ID Labels (2)
• Keypad (3)
• Power LED indicator (4)
CM4 Gas Monitor
1
2
3
4
Figure 2-2: Control Panel
Legend
1
Display
3
Keypad
2
Status LED and point ID labels
4
Power/Lock LED
2.2.1 Display
The display is a 1-line by 20-character vacuum fluorescent display
that shows program and operation information.
In the Monitor Mode, if no gas concentration is detected and in the
Idle Mode, the display brightness is reduced to 60% of full brightness.
This feature extends the life of the vacuum fluorescent display.
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