Chapter Three: Overview
Overview of Modes
81
Normal and Leakage Mode Status Codes (Continued)
" - - - - "
Overrange sensor (upper segments of the display are turned on)
When a sensor’s input goes over range, the
OVERRANGE
legend
appears on the right side of the window.
" .. " or " .... "
Channel turned off (decimal points in the display are turned on)
" . "
Channel auto-powered off.
A single decimal point is displayed for any ion gauge channel that is
turned off with the Auto Power feature. This distinguishes it from a
user commanded turn off condition.
Table 33: Normal and Leakage Mode Status Codes
Setup
Setup Mode is indicated by the
SETUP
legend. Setup Mode is used to set up the 146 unit to
operate according to the needs of a particular control system. For example, alarm trip points are
entered in Setup Mode, and the 146 instrument can be set up to read pressure over a range that is
spanned by two sensors. All miscellaneous codes for the 146 unit are contained within Setup
Mode.
Tuning
Available only if the Control board is installed
This mode is indicated by the
TUNING
legend. In Tuning Mode, specific control parameters
can be adjusted to help fine tune the 146 unit for optimum control performance. These
parameters can be changed individually as the need arises, or changed as part of an associated
collection of control parameters, called a recipe. In either case, the best lead and gain parameters
can be matched with different set points, and associated with a different control channel.
In Tuning Mode there is a deviation indicator which indicates where the controlling sensor’s
pressure reading is relative to set point.
Control
Available only if the Control board is installed
The Control Mode is used to control a valve in one of five ways. The five valve control
positions are
OPEN
,
AUTO
,
CLOSE
,
HOLD
, and
MANUAL
. In addition, one of the four recipes
(edited in Tuning Mode), can be selected as the active recipe. When the 146 unit is set to operate
in
AUTO
mode, it uses the parameters associated with the active recipe to operate the control
valve.
In Control Mode there is a deviation indicator which indicates where the controlling sensor’s
pressure reading is relative to set point.
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