User manual

Model: 2100 &2300 Series
2100UM22.DOC Rev: 2.2
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4.2.3 SLOPE AND OFFSET [CALIB\3]
Use this feature to view and or modify the SLOPE and OFFSET calibration values directly.
 Press the CALIBRATION key to enter the CALIBRATION menu then 3 for Slope/Off.
 Enter the desired SLOPE and OFFSET. If no change is desired just press the Enter key in
each case or a Menu key to go to another menu such as the DISPLAY menu.
4.2.4 FULL SCALE VALUE [CALIB\4]
The 2000 series level controller displays the level in both percent and in engineering units. For
example if depth in feet is desired or if the material capacity in pounds is desired, the appropriate
units are chosen from the Settings submenu of the FUNCTION menu. The unit calculates the
level in engineering units by multiplying the level in percent by the full-scale engineering units
value. The user must set this value. For example if the units chosen are feet and the maximum
height of the tank (internal) is 15.0 feet then 15.0 is the FULL SCALE VALUE, or if the units
chosen are pounds and the maximum tank capacity is 10,000 lbs then 10,000 is the FULL
SCALE VALUE. Entry of this value is described in Section 3.4.6. NOTE: This revision of
software assumes a linear relationship between level % and tank capacity. If the engineering
units chosen are for depth (feet, inches or cm) then this assumption is always true, but if the units
are for volume or mass then the relationship may not be true. For example the mass or volume
contents of a cylindrical tank on its side are not linearly related to the level in % (linear depth).
Arjay can provide custom software based on a customer’s tank dimensions to display the volume
or mass (or other units).
4.3 CONTROL MENU [CONT]
The CONTROL menu allows the setup of the mA output and the Control Relays.
NOTE: The Control Relays and the mA output are set to their OFF states when in the
CALIBRATION menu [CALIB]. In the DIAGNOSTICS menu [FUNCTION \ 2], the mA output may
be set manually by the operator to 4mA or 20mA. In this case the mA output does not reflect
the level value.
4.3.1 mA SETTINGS
The mA output Zero and Span settings may be set anywhere within the measurement range. For
example, if the Zero is set to 30% level and the Span is set at 60% level then the mA output is scaled
between these two points with the mA output indicating low level at 30% and high level at 60%.
NOTE: the Span value (% level) must be at least 1% greater than the Zero value.
The mA output may also be set to Direct or Inverse Acting. In Direct Action, the mA output is 4mA
when the level is at the Zero level and 20mA when at the Span level. In Inverse Action, the mA
output is 20mA when the level is at the Zero level and 4mA when at the Span level.
4.3.2 RELAY SETTINGS
Arjay Level controllers may be used to control devices such as pumps, valves and other equipment
based on level values.
Arjay controllers allow 5 parameters:
1. HIGH ALARM (or CONTROL) POINT
. This value is specified in % level. Above this value,
relay action is taken depending on the Relay Action and Failsafe settings.
2. LOW ALARM (or CONTROL) POINT
. This value should be less than the High control point.
Below this value, relay action is taken depending on the Relay Action and Failsafe settings.
3. RELAY ACTION
. High or Low Action. Selecting high action will energize the relay when the
level exceeds the high control point for at least the time delay period. An LED on the front panel