O p e r a t i o n s a n d I n s t r u c t i o n M a n u a l
57
S A G E M E T E R I N G , I N C .
REV. 03-SIE/SRE
Example 1:
Changing a Generic SFPM to an SCFM Meter
for a 4" Pipe Using Sage VIP
The previous changes could also be done with the
Sage VIP and a Laptop. However, in this example,
assume that the meter has only one range (Channel
A), but is set up as generic velocity meter, in units
of 0-25,000 SFPM. You decide to use the meter in a
4" pipe, and want units of SCFM instead of SFPM.
1. Open up Sage VIP
2. Press Space Bar
3. Type in 100 (at the prompt) so the flow is running
(Flow Mode). Initially units will be in SFPM
4. Press Space Bar
5. Type in 99999 and Enter to unlock the meter
(the text will say "Channel A Active" once it is
unlocked)
6. Type in 300 to bring up Flow Basics Menu
7. Type in 305 to bring up Pipe Area
8. Change pipe area from 1.000 to 0.0884 (see
Probe Insertion Guidelines for the pipe area for a
4" pipe which is .0884 sq ft)
9. Type in 400 to bring up Engineering Units
10. Type in 406 and Enter for SCF
11. Type in 422 and Enter for Minutes
12. Type in 100 to complete process. Note, meter is
now in SCFM units
13. Follow Probe Insertion Guidelines to insert the
meter into center of a 4" pipe
Example 2:
Changing Channels using Sage VIP
To change channels from Sage VIP (our navigational
software) with the laptop, there is a shortcut:
1. First be sure that the meter is reading Flow (press
space bar, then select 100 at the prompt, to bring
up Flow Mode)
2. Type uppercase B. It will switch to channel B
within 10 seconds
3. To switch to another channel, for example, C,
type upper case C
Examples Using the Laptop
1
Example 3:
Changing Channels Externally
Finally, the channels can be switched externally,
by contact closure, using a switch, a PLC, or a relay
(see item 701 on page 44, and enable external
switching by selecting “4” in item 701). The descrip-
tion in item 701 (on page 48) also denotes which
terminals to connect to.
Example 4:
Dual Channel/Dual Sensitivity Meters and
Auto Ranging
Note:
Some customers order dual channel/dual sensi-
tivity meters, and using externally latched relays, or
a PLC, can autorange between Channel A and
Channel B. For example, Channel A on a SRG meter
can be ranged for 0-500 SCFM, and have one of the
optional relays programmed in Channel A to TRIP
HIGH at 450 SCFM, thus sending a contact closure to
the PLC. The PLC, in turn, will ground terminal 16
(effectively connecting terminal 16 to terminal 17).
That switches the meter into Channel B, which has a
range of 0-20,000 SCFM. If the flow falls below 400
SCFM, its relay TRIPS LOW, and the PLC removes the
switch closure between Terminal 16 and 17, which
causes the meter to switch back to Channel A. So
this scheme effectively provides an autoranging
meter, and a turndown of 4000 to 1! (5 SCFM to
20,000 SCFM). Alternately external latching relays
could also provide the ability to autorange. (Note, in
this example, Channel A will be factory configured
for a very high sensitivity, by raising the delta T [the
overheat] so as to detect even the slighest movement
of gas.) Channel B will have a much lower delta T.
Thus, when the channels switch back and forth, not
only does the calibration range change—so does the
delta T (the overheat).
There is no other feature
which more clearly defines the concept of “Totally
Independent Channels”—for even the overheat
changes when the channels switch back and forth.
1
Note, to unlock the Flow Meter so data can be changed, type in 99999 at the prompt; in a single
channel Flow Meter, the displayed text changes from "Chan A Locked" to "Chan A Active", indicating
that changes can be made.
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