83
DIN HALF SIZE LCD
DISPLAY HOUR METER LH24
Hour Meters
•Large 7-digit LCD display value reading
• Unnecessary “0”s are eliminated from the upper digits
of elapsed value for easy reading
• Wide range of measurement:
0 to 3999 days 23.9 hours (exclusive for flush mounting type)
0 to 99999.99 hours
0 to 9999 hours 59.9 minutes
• Two mounting types available
LH24-F: Flush mounting type
LH24-C: PC board mounting type
PRODUCT TYPE
1) Non-voltage input type
SPECIFICATIONS
Input signals
Types with manual reset Rated operating voltage Max. current
consumption Counting range Input
Built-in battery
(Battery life: 10 years) —
20 µA
(When resetting:
20 µA)
0 to 3999 days 23.9 hours
Non-voltage input
0 to 99999.99 hours
0 to 9999 hours 59.9 min
0 to 99999.99 hours
0 to 9999 hours 59.9 min
3 V DC
(Uses manganese dioxide
lithium battery)
LH24-F-DH LH24-F-DH-N
LH24-F-H
LH24-F-HM
LH24-F-H-N
LH24-F-HM-N
LH24-C-H
LH24-C-HM
—
—
without manual reset
Part Number
LH24-F
Flush
mounting types
LH24-C
PC board
mounting types
2) Voltage input type
Types with manual reset Rated operating voltage Maximum current
consumption Counting range Input
Built-in battery
(Battery life: 6 years)
Built-in battery
(Battery life: 10 years)
—
0 to 3999 days 23.9 hours 100 to 120 V AC/DC
(signal reset is controlled
by non-voltage input)
200 to 240 V AC/DC
(signal reset is controlled
by non-voltage input)
4.5 to 30 V DC
0 to 99999.99 hours
0 to 9999 hours 59.9 min
0 to 3999 days 23.9 hours
0 to 99999.99 hours
0 to 9999 hours 59.9 min
0 to 3999 days 23.9 hours
0 to 99999.99 hours
0 to 9999 hours 59.9 min
LH24-F-DH-AL LH24-F-DH-AL-N
LH24-F-H-AL
LH24-F-HM-AL
LH24-F-DH-AH
LH24-F-H-AH
LH24-F-HM-AH
LH24-F-DH-DL
LH24-F-H-DL
LH24-F-HM-DL
LH24-F-H-AL-N
LH24-F-HM-AL-N
LH24-F-DH-AH-N
LH24-F-H-AH-N
LH24-F-HM-AH-N
LH24-F-DH-DL-N
LH24-F-H-DL-N
LH24-F-HM-DL-N
without manual reset
Part Number
LH24-F
Flush
mounting types
Operation
signal
Signal reset
Manual reset minimum input width
Minimum operating
signal width
Non-voltage input type
Flush mounting type PC board mounting type AC/DC input type DC input type
Voltage input type
Input method
Input impedance
Residual voltage
Min. signal reset width
Input method
Input impedance
Residual voltage
40 ms (Maximum 25 ms deviation)
Non-voltage input: Contact/Open collector
Non-voltage input: Contact/Open collector
Maximum: 1 kΩwhen short-circuited
Minimum: 100 kΩwhen open-circuited
0.5 V
20 ms 500 ms 20 ms
20 ms 500 ms 20 ms
7.5 kΩ
Maximum: 1 kΩwhen short-circuited
Minimum: 100 kΩwhen open-circuited 7.5 kΩ
—
0.5 V —
ON: 100 to 120 V AC/DC
200 to 240 V AC/DC
OFF: 0 to 2 V AC/DC
ON: 4.5 to 30 V DC
OFF: 0 to 2 V DC
ON: 4.5 to 30 V DC
OFF: 0 to 2 V DC
15 17
14 12
26 28
3 1
3 V DC lithium battery
Reset input
Signal input
Contact input
15 17
14 12
26 28
3 1
3 V DC lithium battery
Reset input
Signal input
Open collector
input
Note:
are connected
internally.
and
12 14
26 28
1 3
15 17 ,,
Reset input
Counting input
2
1
4
3
Reset input
Counting input
2
1
4
3
Open collector input
0 V 0 V
Contact input
Note: are connected internally.
2 4
Counting input
(1) Reset terminal (contact input)
Reset input
Counting input
2
1
4
3
(1) Contact input
+V
0 V
+V
0 V
• Terminal are connected internally.
2 4 (Voltage signal is recognized when the transistor ❈ is switched to OFF.)
Reset input
Counting input
2
1
4
3
(2) Open collector input
+V
0 V
+V
0 V
❈
❈
• DC voltage input
Reset input
2
1
4
3
• Timing input terminals ( , ) and reset input terminals ( , ) are insulated internally.
or
431 2
(2) Reset terminal (open collector input)
Reset input
Counting input
2
1
4
3
0 V
or
Characteristics
Rated operating voltage
Type
Battery life
Shock resistance
Vibration resistance
Ambient temperature
Storage temperature
Ambient humidity
Counting direction
Functional
Destructive
Functional
Destructive
Non-voltage input type
LH24-F
Flush mounting type LC24-C
PC board mounting type AC/DC input type DC input type
Voltage input type
Built-in battery
10 years
10 G (4 times on 3 axes)
30 G (5 times on 3 axes)
10 to 55 Hz: 1 cycle/min double amplitude of 0.3 mm (10 minutes on 3 axes)
10 to 55 Hz: 1 cycle/min double amplitude of 0.75 mm (1 hour on 3 axes)
-10 to +55°C (+14 to 131°F)
-25 to +65°C (+13 to 149°F)
35 to 85% RH
Addition (UP)
— 6 years 10 years
3 V DC
(manganese dioxide
lithium battery) Built-in battery
DIMENSIONS
LH24-F, flush mounting type (Common for non-voltage input type and voltage input type)
LH24-C, PC board mounting type
WIRING DIAGRAM
mm (inch)
38.9
1.531
44.5
1.752
24
.945
HOURMETER
48
1.890
LH24
RESET
Reset push-key switch*
*Without reset push key switch is also available
4.5
.177 28.8
1.134 10.1
.398
22
.866
M3.5 self-up
terminal screw Panel cutout dimensions
Panel thickness: 1-4.5 mm
22.2+
00.3
.874+
0.012
45+
00.6
1.772+
0.024
WIRING DIAGRAM
1) Non-voltage input type 2) Voltage input type
• AC/DC voltage input
Main body’s
occupied section
Compatible 28-pin dip terminal
2.54
.100
2.54
.100 8-0.8 dia.
8-.031 dia.
1.9
.075
15.24
.600
4.6
.181
1.9
.075
4.6
.181 5.08
.200
5.08
.200
33.02
1.300
PC board pattern (Bottom view)
17.1
.673
0.5
.020
3.3
.130
5.08
.200
0.6
.024
33.02
1.300 5.08
.200 Dip terminal x8
19
.748
HOURMETER
42.2
1.661
LH24
RESET
Reset push-key switch
15.24
.600
0.3
.012
84
85
OPERATION EXPLANATION 1) Time is counted while the signal input is ON. The decimal point on
the front panel LCD flashes during counting operation.
2) When the elapsed (measuring) time is fullscale, the display returns to
“0” and measurement starts from “0” again.
3) While the reset input is ON, the signal time is not counted and the
display is “0”. In the case of the PC board mounting type, while the
reset input is ON, the display does not change. However, when the
reset input becomes OFF, the display will change to “0”.
Signal input
Reset input
Full scale
Elapsed time PC board
mounting type
CAUTIONS
<Non-voltage input type>
1.Since the current from the signal input
and reset input terminals [1-3(flush
mounting type), %-i(PC board
mounting type)] is small, use relays
and switches which have high-reliabili-
ty contact performance.
2.When input signals are triggered
through the transistor ’s open collector,
use a small signal transistor with an
ICBO less than 1 µA, being sure to trig-
ger them with no voltage across the
collector.
3.When connecting the signal input and
reset input wires, do not run them par-
allel to high-voltage or power cables
and avoid using the same conduit. Use
shielded wires or metallic conduits
which are as short as possible. If the
floating capacitance of the wires
exceeds 500 pF (approx. 10 m for par-
allel wires of 2 mm2), it will cause mal-
functions.
4.Lithium batteries are built in the flush
mounting types. Never throw them into
a fire. Do not dispose of them in trash
intended to be incinerated.
•PC board mounting type—
1.After connecting the external power,
be sure to reset it to make sure that
“0” appears on the display.
2.Battery life is calculated as follows:
t = A
I
t: Battery life (h)
I: Consumption current (mA)
A: Battery capacity when the operating
voltage becomes minimum.
3.Hand soldering:
<Voltage input type>
• AC/DC Voltage input type
1.Apply voltage to the signal input termi-
nal. Do not apply voltage to the reset
input terminal. When voltage exceed-
ing the range of the rated input voltage
is applied to the signal input terminal,
or if voltage is applied to the reset ter-
minal, it may cause break-down of
internal elements.
2.Since the current from the reset input
terminal is small, use relays and
switches which have high-reliability
contact performance.
3.When reset is triggered through the
transistor ’s open collector, use a small
signal transistor with an ICBO less than
1 µA, being sure to trigger it with no
voltage across the collector.
4.For external reset, make a temporary
short-circuit between the rear reset ter-
minals [3-4].
•DC voltage input type
1.When more than 30 V DC is applied to
the signal or reset input terminals, it
may cause breakdown of internal ele-
ments.
2.For external reset, voltage is applied
between the rear reset terminals
[3-4] to the H level (4.5 to 30 V DC).
In this case, connect (–) to terminal 4
and (+) to terminal 3]. Since they are
polarized, they will not operate with
reverse polarity.
Soldering iron
Iron tip temperature
Soldering time
30 W to 60 W
Approx. 300°C (572°F)
Less than approx. 3 seconds
• Common
1.When connecting the signal input
wires [1-2] and reset input wires
[3-4], do not run them in parallel with
high-voltage or power cables. Avoid
running signal or reset wires in a
power conduit. Use shielded wires or
metal conduits which are as short as
possible. If the floating capacitance of
these wires exceeds 500 pF (approxi-
mately 10 m for parallel wires of
2 mm2), it will cause malfunctions.
2.Lithium batteries are built in.
Never throw them into a fire. Do
not dispose of them in trash intended
to be incinerated.
