Oldham OLCT 200, Руководство пользователя, Страница: 33 / 80

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OLCT 200 User Manual | 33
SECTION 3 -
INITIAL START-UP
3.1
“Transmitter Configuration” Menu
Figure 3-1shows the OLCT 200 XMITTER CONFIG menu used to activate channels,
precisely calibrate 4-20mA outputs and set time / date. Its menus are set at the factory
and typically not needed by the user. To access from any data display, press and hold
the NEXT key for 5-seconds until the screen appears requesting a special key
sequence (4-UP keystrokes). Note that not all menu options will be displays for certain
models and configurations.
Figure 3-1: Transmitter Configuration Menu
3.1.1 Single / Dual Gas Monitor Configuration
2-wire 4-20mA and wireless OLCT 200
’s devices support only one electrochemical
sensor. Addition of the 10-0233 Power Supply board automatically adds the catalytic
bead, IR, and PID sensor input. With the addition of the10-0233 Power Supply Board,
3-wire models have dual 4-20mA output capability. If both the O2/TOXIC and
LEL/Current menu items are ON, the OLCT 200 will function as a dual gas monitor with
both sensor inputs and 4-20mA outputs active. Either input may be turned off for
single gas EC or LEL monitors.
3.1.2 Output Zero / Output Span Trims (Wired Models Only) (Factory Preset,
Technicians only!):
The Output Zero Trim / Output Span Trim entries are digital to analog (D2A) values
that determine the OLCT 200
’s final 4-20mA output. Their purpose is to provide
precise OLCT 200 4mA and 20mA outputs. To trim these values, attach a precision
milliamp meter to the OLCT 200 4-20mA output being used. Enter the correct
OUTPUT ZERO TRIM menu shown in Figure 3-2. Use the UP/DOWN keys to trim the
milliamp value to 4.00mA. Next, enter the correct OUTPUT SPAN TRIM menu and
use the UP/DOWN keys to trim the milliamp value to 20.00mA. Press the NEXT key to
exit this menu. The OLCT 200 stores these new D2A values and uses them as the 0 &
100% of full-scale endpoints.
WARNING:
Target gas monitoring and alarm processing are halted during these
adjustments.