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DELTA M Corporation
3242-OM-04 3/27/02
6
100
0
%
TRIP POINT
CALIBRATION
SIGNAL PROCESSING ELECTRONICS
0 FLOW / DRY CAL.
MAX.FLOW / WET CAL.
VCC
1
NC
NO
2
3
C
CONTACT 2
4
NC
NO
5
6
C
CONTACT # 1
H
7
8
N
POWER IN
RELAY
LED LIGHTS
RED
GREEN
A
B
FAILSAFE LOGIC
RELAY DRIVER
VCC
VCC
1
RTNS
RTN
2
3
CS
4
C
HS
5
H
VCC
COMPARATOR
CURRENT SOURCES
SENSORS EXCIT. CURRENTS RETURN
9
10
PROBE
ENCLOSURE
POWER SUPPLY
VCC
SAFETY GROUND
TEST POINTS
6
TBA
DRAWING FILE: MTF3A00.DWG/.FCW
Figure 3.A shows a block diagram of the microtuf® switch.
Once the switch is set to respond to the minimum and maximum flow rates (or wet vs. dry
conditions), the trip point is set by adjusting the Trip Adjust Potentiometer. Solid state
electronics transform the flow (or wetting) induced temperature differential into a voltage that
is compared to a control voltage. Matching voltages cause actuation of a relay to indicate a
change in state (flow vs. no-flow or dry vs. wet).
FIGURE 3A: MICROTUF SERIES SWITCH BLOCK DIAGRAM
MODELS LS32CS/FS42CS, LS32CN/FS42CN, LS32NX/FS42NX,
AND
LS32SK/FS42SK
(MTF3A00.DWG/.FCW)