MNA0010, Revision B October 2014
22
2.1.2.2
Electrical Connections:
When Using the 7100P as a monitor only, you need only
connect the power input cord into the power socket and turn the unit on [after a 5
second purge]. It is possible to record the data via the RS-232 serial port, 4-20 mA
analog output, or the analog voltage output. The 7100P features 2 alarms that can
be set to specific gas concentration set points. Local LEDs signify the alarm status. If
you have the optional relay outputs, you can preset alarm levels and interface to dry
relay contacts. The serial, analog, and optional alarm outputs are available at
terminal blocks located behind the rear access panel. Simply remove the plastic
panel to gain access to the pluggable terminal blocks.
A label depicting the terminal
block arrangement is affixed to the back of the access panel for easy reference during
installation and maintenance. The terminal blocks feature screwed terminals. The
terminal blocks are removable for ease of wiring or removal of the analyzer module.
Please reference the attached sketch showing the detail of the electrical interface
terminals.
WARNING:
Be certain that all power is OFF to the analyzer and
associated wiring (cables) before attempting installation. DO NOT
WORK WITH LIVE WIRES! Do not leave any exposed wire at the
terminal blocks. Before applying power, ensure terminal blocks are
fully inserted into the mating connector at the analyzer.
To remotely detect the present range of oxygen concentration, the Model 7100P Portable
analyzer features a optional 0-10 volt
auto-range identification output
which is available if you
purchased the Alarm Relay Option. See Table below under the “Range Voltage Output”
heading.
Figure 23 Range Description Table
Display
range
Setting
(internal to
software)
Range
Name
Measurement
Range
Display Analog Range
Range
Voltage
Output
( + 0.01 vdc)
1
Fixed 0-10
ppm Range
0 < x < 9.9 PPM
X.X
0…10PPM
3.13 Vdc
2
Fixed
0-100 ppm
Range
0 < x < 99 PPM
XX.X
0…100 PPM
3.75 Vdc
3
Fixed 0-2000
ppm Range
0 < x < 2000
PPM
XXXX.X
0…2000 PPM
4.38 Vdc
8
Auto Range
0 < x < 2000
PPM
XX.X-
XXXX.X
0-9.9
10.0
–99.9
100-1999.9 PPM
3.13 Vdc
3.75 Vdc
4.38 Vdc
