HEIGHT TRANSMITTER
DATA SHEET
This is a height transmitter utilizing an induction poten-
tiometer.
A wire rope is placed atop the gas holder whereby the
lift of the holder moves the rope which in turn rotates the
pulley. This motion is conveyed to the induction potenti-
ometer which then provides a current signal of 4 to 20mA
DC proportional to the holder lift.
FNG
FEATURES
1. High reliability
A contactless induction potentiometer is employed which
assures a long life and high reliability of the instrument.
2. Various specifications available
The transmitter can be provided with intrinsically safe
explosionproofing, various materials for its components,
an arrester, an alarm unit and other specifications.
SPECIFICATIONS
Measuring range:
0 to 0.5.........40 m
(If equipped with a reduction gear, the
range of measurement can be increased
up to 320m)
Standard range of measurement:
As listed in table on page 2
Indicator:
Digital type (4 digits)
Allowance:
±
1.0%
Output signal:
4 to 20mA DC
Ripple content:
1.5% peak to peak (at approx. 25 kHz)
Allowable load resistance:
0 to 550Ω (at 24V DC)
Power supply:
13 to 33V DC
(26V DC or less with intrinsically safe
explosionproofing)
(27V DC or less with arrester)
100V/24V AC
±
10%, 50/60 Hz
(see "Example of configuration" on page
5)
Ambient temperature:
–30 to +80°C
(Not usable in freezing condition)
50
°
C max. with intrinsically safe
explosionproofing
60°C max. with arrester
Ambient humidity:
Less than 95% RH
Principal materials:
Wire rope; stranded mild steel wire or
stranded stainless steel wire
Counterweight; iron or stainless steel
Instrument body; aluminum alloy
Conduit connection:
G3/4
Case:
Splash-proof type (JIS C 0920)
Arrester:
Built-in on request
Explosionproof structure:
Intrinsically safe explosionproofing
i3nG5
Mass (weight):
Approx. 10.5kg
External dimensions (HxWxD):
Approx. 320 x 346 x 218 mm
EDS7-4f
Date
Apr. 10, 1992
FNG
Finish color:
Silver (melamine paint);
acid and alkaliproof treatment is available,
on request
CODE SYMBOLS
1 2 3 4 5 6 7 8
9 10 11 12
F NG
4
Description
Length [m] of 4mm dia. wire rope
10
15
20
25
30
40
50
60
Optional specifications
Alarm unit (limit switch)
(Cannot be installed on a transmitter
equipped with intrinsically safe explosion-
proof structure);
Contact capacity
250V AC 5A
230/115V DC 0.2/0.4A
N.O "1a" contact
3 pieces are available in the trans-
mitter for upper limit and lower limit
Reduction gear
(Employed for a range of measurement
exceeding 40m)
2
3
4
5
6
7
8
* 9
Y
*A
*B
*C
*D
*E
F
H
J
K
L
M
0
* 1
A
B
K
Scope of delivery:
Transmitter and standard accessories;
(wire rope (4mm dia.), counterweight,
guide pulley (3 pcs))
Reduction gear (reduction ratio 1:8), on
request;
(moving pulley, fixed pulley, intermediate
counterweight and wire rope (6mm
dia., length as requested))
Length [m] of 6mm dia. wire rope
None (no reduction gear
provided)
30
40
50
60
80
100
120
140
160
180
200
Reduction gear
None (standard)
Provided (for high lift)
Transmitter
4 to 20mA
4 to 20mA intrinsically safe
explosionproof structure
"A" with arrester
Alarm unit (limit switch)
Note: Impossible when "B" specified
in 7th digit of code.
None
Upper/lower limit, 1 piece each
Upper/lower limit, 2 pieces each
Upper/lower limit, 3 pieces each
Material of counterweight
Iron
Stainless steel (SUS304)
Material of rope
Stranded mild steel wire
Stranded stainless steel wire
(SUS304)
Y
B
Treatment
Standard
Acid and alkaliproof treatment
List of standard measuring ranges
Measuring
range [m]
0
0
0
0
0
to
to
to
to
to
0.5
1.5
2
2.5
3
Measuring
range [m]
0
0
0
0
0
to
to
to
to
to
3.5
4
4.5
5
5.5
Measuring
range [m]
0
0
0
0
0
to
to
to
to
to
6
6.5
7
8
9
Measuring
range [m]
0
0
0
0
0
to
to
to
to
to
10
12
14
15
16
0
2
4
6
E
* S
E
* S
Note: *items:Nonstandard
2
INSTALLATION INSTRUCTION
Fig. 1 When normal lift
Fig. 2 When high lift
(with reduction gear)
Composition
Transmitter ----------
Guide pulley --------
4mm dia. rope -----
Counterweight ----
1
3
1
1
In Fig. 1:
Transmitter mounting height
HT [m] > H
4
+ 1.5m
Rope length (4mm dia. stranded mild steel wire)
H
1
+ 6m
L
4
[m]
Composition
Transmitter ----------
Guide pulley --------
6mm dia. rope ---
Counterweight ----
Fixed pulley ---------
Moving pulley -----
Intermediate
counterweight ---
4mm dia. rope -----
1
3
1
1
1
1
1
1
In Fig. 2:
Transmitter mounting height
H [m]
HT [m] >
4
+ 1.5 [m]
8
Rope length (6mm dia. stranded mild steel wire)
2xH
4
+ 6 [m]
L
6
[m]
Rope length (4mm dia. stranded mild steel wire)
H
4
[m]
+ 5 [m]
L
4
[m]
8
Where
H
4
: Holder lift variation
H
1
: Holder maximum height
3
FNG
OUTLINE DIAGRAM
(Unit:mm)
4
PRINCIPLE OF INDUCTION POTENTIOMETER
When the short circuit ring is positioned at the center,
the magnetic flux on left and right sides is equal and the
voltages produced at detecting coils S
1
and S
2
are equal.
But if the ring is rotated to the right side for example, then
the flux at S
1
will increase and that at S
2
will decrease. Ac-
cording to this difference an output voltage is produced which
is proportional to the ring displacement (input rotating angle).
EXAMPLE OF CONFIGURATION ACCORDING TO POWER SUPPLY
5
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