Honeywell MagneW 3000 Plus - Ranging Functionality

1/98 MagneW 3000 PLUS Specification and Application Guide 11
Ranging Function
The range function allows the operator to define the basic operating
characteristics of the flowmeter. Table 3 explains the various function options
that are available.
Table 3—Summary of Range Function Options
Analog
Contact
Type Description Output Pulse Display
Input Output
Single Range • Direct flow only with
one 4 to 20 range
Forward:
4-20 mA dc
Proportional Positive No effect
Reverse:
–20%
(0.8 mA)
Not delivered Minus
Direct, Dual
Range, Auto
Selection
• Direct flow only with
two ranges
• Switching between
measuring ranges is
automatic
(Hysteresis is
illustrated in Figure
10.)
Both 4 to
20 mA dc
Pulse weight for
both ranges is
the same
No effect Factory setting
1st range: open*
2nd range:
closed*
Direct, Dual
Range, External
Selection
• Direct flow only with
two ranges
• Switching between
ranges is done
externally
Both 4 to
20 mA dc
Pulse weight for
both ranges is
the same
Range select
1st range:
open
2nd range:
closed
Factory setting
1st range: open*
2nd range:
closed*
contact outputs
(optional)
Direct/Reverse,
Dual Range,
Auto Selection
• Direct and reverse
flow with two ranges
• Switching between
measuring ranges is
automatic
(Hysteresis
illustrated in Figure
11)
Both 4 to
20 mA dc
Pulse weight is
same
regardless of
flow direction
Minus sign
appears
when flow is
in reverse
direction
No effect Factory setting
direct: open*
reverse: closed*
Direct/Reverse,
Dual Range,
External
Selection
• Direct and reverse
flow with two ranges
• Switching between
ranges is done
externally
Both 4 to
20 mA dc
Pulse weight is
same
regardless of
flow direction
Minus sign
appears
when flow is
in reverse
direction
Range select
direct: open
reverse:
closed
Factory setting
direct: open*
reverse: closed*
contact output
(optional)
*Reverse setting is also possible.
23449
Input
Output
20 mA
4 mA
Adjustable by 0-20%
Figure 10—Direct Direction, Automatic
Dual Range Transfer Hysteresis
23450
Input
Output20 mA
With respect to reverse
direction range,
adjustable by 0-20%
Reverse
direction
Direct
direction
With respect to direct
direction range,
adjustable by 0-20%
Figure 11—Direct/Reverse Transfer Hysteresis