LT1013/LT1014
TYPICAL APPLICATIONS
Hot Wire Anemometer
500pF
+15V
Q2–Q5
CA3046
PIN 3 TO –15V
Q3
1000pF
7
2k
Q4
150k*
1µF
12
12k
2M
FULL-
SCALE
FLOW
Q5
2k*
Liquid Flowmeter
3.2k**
1M*
+15V
15Ω
DALE
HL-25
3.2k*
1M*
2
10M
RESPONSE
TIME
1
100k
6.25k**
1M*
T1
T2
+15V
100k
2N4391
0.1
LT1004
–1.2
383k*
2.7k
10
–15V
300pF
OUTPUT
0Hz
300Hz =
0
300ML/MIN
1N4148
4.7k
1µF
10
+
–
9
A3
LT1014
8
100k
100k
T1
FLOW
PIPE
15Ω HEATER RESISTOR
+
6.25k**
1M*
3
12
+
–
+15V
4
14
13
A4
LT1014
11
–15V
T2
FLOW
* 1% FILM RESISTOR.
** SUPPLIED WITH YSI THERMISTOR NETWORK.
T1, T2 YSI THERMISTOR NETWORK = #44201.
FLOW IN PIPE IS INVERSELY PROPORTIONAL TO
RESISTANCE OF T1–T2 TEMPERATURE DIFFERENCE.
A1–A2 PROVIDE GAIN. A3–A4 PROVIDE LINEARIZED
FREQUENCY OUTPUT.
+
A1
LT1014
5
–
6
+
10
–
–
+
#328
3
–
2
+15V
4
1
1k
ZERO
FLOW
A1
LT1014
11
–15V
REMOVE LAMP'S GLASS ENVELOPE FROM 328 LAMP.
A1 SERVOS #328 LAMP TO CONSTANT TEMPERATURE.
A2-A3 FURNISH LINEAR OUTPUT vs FLOW RATE.
* 1% RESISTOR.
+
5
10M
RESPONSE
TIME
ADJUST
100k
3.3k
–15V
500k
1µF
9
A3
LT1014
8
A2
LT1014
7
6.98k*
5k
FLOW
CALIB
1k*
+
27Ω
1W
10k*
0.01µF
33k
–
6
A2
LT1014
–
U
Q1
2N6533
220
Q2
2k
150k*
13
A4
LT1014
14
0V–10V =
0–1000 FEET/MINUTE
LINER [ LINEAR TECHNOLOGY ]
