Dwyer UXF2 - Manual (Page 61)

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20mA
4mA
SPAN-1
SPAN-2
Hysteresis
4.5.5.2. Setting forward automatic 2 ranges
Description
z
The function carries out a measurement while changing over
the range according to the flow rate.
z The current output changes with the action range as
illustrated on the right.
z The hysteresis can be set to between 0 and 10% of the
smaller range.
z Upon setting DO1 or DO2 to "FLOW SPAN-2", a contact
outputs "SPAN-2" action. Select [ACTIVE ON] or
[ACTIVE OFF] separately
(see Section 4.5.7.3.).
z After changing the range value, adjust zero point
(see Section 4.5.1.).
z Settable range: 0.3 to 10 [m/s] in terms of flow velocity in piping for any of SPAN-1 and SPAN-2.
* The piping parameters and FLOW UNIT must be set beforehand.
* If a value beyond the settable range is inputted, "INPUT ERROR" appears and then last setting is resumed.
* If "FLOW UNIT" has been changed after setting the range, set the range setting again.
* When FLOW SPAN-2 is not used (in the case of single range), set “0” for FLOW SPAN-2.
Note: 1. The flow rate unit is as selected by "FLOW UNIT". Before setting range, set the "FLOW UNIT"
(see Section 4.6.2.).
For actual keying, refer to the typical operation indicated below. Set the parameter protection to OFF beforehand
(Section 4.4.1).
Typical operation Set "FLOW SPAN-1" to 10 [m 3 /h], "FLOW SPAN-2" to 60 [m 3 /h], and "HYSTERESIS" to 7%.
* Set the piping parameters and "FLOW UNIT" beforehand.
Keying order Description Indication
ź
Pressed twice to indicate "OUTPUT SETUP". OUTPUT SETUP
ENT
ź
Pressed to indicate "ZERO ADJUST". ZERO ADJUST
CLEAR
ź
Pressed 4 times to indicate "RANGE". RANGE
FLOW RATE
ENT
ź
Pressed to blink the cursor. RANGE
FLOW RATE
ENT
ź
Pressed to indicate "FLOW SPAN-1". FLOW SPAN-1
20.0000 m3/h
ENT
ź
Pressed to blink the cursor on 2nd line. FLOW SPAN-1
0 020.0000 m3/h
ź
Pressed repeatedly until the cursor is positioned at "2". FLOW SPAN-1
00
2 0.0000 m3/h
ź
Pressed repeatedly until "1" appears.
Note: To change the decimal point position, align the
cursor with a place to change to, and press
key likewise.
FLOW SPAN-1
00
1 0.0000 m3/h
ENT
ź
Pressed to register it. FLOW SPAN-1
½½ COMPLETE ½½
Ļ
BULLETIN F-70