IMMERSION TYPE LEVEL METER
DATA SHEET
FQK
This level meter is used for measuring the level of underground water, river, clean water, sewage or industrial waste
water. It measures the level in the from of water head pressure, converts it into a current signal and then transmits it to a
receiving instrument.
The detector is either suspended in the water or placed on
the bottom of the water. The water head pressure acting on
the diaphragm is measured via a diffusion type silicon strain
gage.
Transmitter
FEATURES
1. Compact, lightweight and highly reliable
Use of a diffusion type silicon strain gage in the pressure
receiving section makes the instrument compact, lightweight, and strong against vibration and shock, and it can
be installed anyplace.
2. Easy to install
Detector
Since the detector is small and light, it can be readily lowered into or lifted out of the water via a cable; use of a chain
is unnecessary. For placing it at the bottom of the water,
the detector can be attached to a stand to keep it stable.
Power supply: 24V± 10%DC, 0.48W
(100V or 24V± 10%AC, 50/60Hz, is also
usable. See “Example of configuration”.)
3. Easy to install
The construction of the instrument enables easy adjustment of zero point, span and damping in the field.
Wiring system: 2-wire system
Liquid temperature:
0 to 30˚C
4. Usable for any kind of water
This level meter can be used for clean water, sewage water, industrial water, agricultural water, industrial waste
Ambient temperature:
-20 to +60˚C
water, river water or underground water etc.
Ambient temperature:
5. Arrester is builted-in.
Damping:
of 0.8, 2.2, 6 sec; selectable in 4 steps
SPECIFICATIONS
Measuring range: 0 to 3, 5, 10, 20, 30m
Material:
Less than 90% RH
No damping, or damping with time constant
(water density: level message of “one”)
Detector; Pressure receiving diaphragm
316L stainless steel
Other wetted parts
304 stanless steel
Cable
Stand
Transmitter:
PVC covering
304 stainless steel
Aluminum alloy (epoxy-polyurethan double coating, silver)
(Field indicator cover; black N3)
Output signal: 4 to 20 mA DC
Allowable load resistance:
0 to 550Ω(at power supply of 24V DC)
Zero adjustment, span adjustment width:+1.5m
Upper limit of span: 30 m
(
Lower limit of span: 3 m
)
Transmitter waterproof structure:
JIS C 0920 immersion-proof type
External dimensions:
Detector: φ43 x 185mm
Transmitter(H x W x D);
110 x 160 x 185mm
Mass {weight} approx:
Detector; 0.8 kg
Transmitter; 3.5 kg
Cable; 0.3 kg/m
Mounting method:
Detector; Suspended in water or placed at
water bottom
EDS7-11d
Date
July. 20, 1994
FQK
Transmitter;
Mounted horizontally or vertically on
50A(2B) pipe with U-boit
Conduit connection:
JIS G1/2
Arrester:
Built in
Protective perfomance:
Voltage limit;
Between lines: 50V or less
For earth and line: 200V or less
Operation delay;
Less than 0.5µs
Max. discharge current;
8 x 20µs, 2000A
OPERATING PRINCIPLE OF DETECTOR
Repetitive discharge;
400 times at 8 x 20µs, 100A
15 sec intervals
Earthing resistance; Less than 100Ω
Optional specifications
Field indicator: Built in transmitter case, class 1.5, 0 to 100%
linear scale or actual-value scale
Detector stand: For installing detector at water bottom;
304 stainless steel, approx. 1.8 kg
Characteristics
Accuracy:
± 0.5% max.(under standard conditions)
Sensitivty:
± 0.05% max.
Allowable over-pressure:
150% of measuring range
CODE SYMBOLS
1 2 3 4 5 6 7 8
F QK
W
9 10
Description
2
Measuring range [m]
0 to 3
0 to 5
0 to 10
0 to 20
0 to 30
1
2
3
4
5
Hollow cable length L [m]
(total length=measuring range + L)
Measuring range + 5 (basic)
Measuring range + 10
Measuring range + 20
Measuring range + specified value
(total length must be 100m or less)
1
*2
*3
*Z
Transmitter and flied indicator
4 to 20mA
A with flied indicator
(0 to 100% linear scale)
A with flied indicator
(m actual-value scale)
A
D
E
0
1
Y
*B
Option
None
With detector stand
Treatment
None
Acid and alkali-proof treatment
(transmitter and mounting parts)
FUNDAMENTAL BLOCK DIAGRAM
Detector
Level
(input pressure)
Pressure receiving
diaphragm
Resistance Mesauring
Silicon diaphragm,
diffusion type strain gage change
circuit
Voltage
change
Atmospheric pressure
Transmitter
Zero and span
adjusting circuit
Conversion circuit
(damping adjusy circuit)
Arrester
Output
current
OUTLINE DIAGRAM (Unit:mm)
FQK
EXAMPLE OF CONFIGURATION
EXTER CONNECTION DIAGRAM
RELATED DEVICES
Opener
Distributor
+
–
Check
terminals
Hollow cable
E
O– O+
Load
0 to 550Ω
24V
DC
To detector
*Asterisked items; Non standard
ORDERING INFORMATION
1. Measuring object of application
2. Product name
3. Code symbols
4. Measuring range
5. Special specifications requirement
6. Other necessary items
Caution on Safety
*Before using this product, be sure to read its instruction manual in advance.
Head Office
6-17, Sanbancho, Chiyoda-ku, Tokyo 102-0075, Japan
http://www.fesys.co.jp/eng
Sales Div.
International Sales Dept.
No.1, Fuji-machi, Hino-city, Tokyo, 191-8502 Japan
Phone: 81-42-585-6201, 6202 Fax: 81-42-585-6187
http: //www.fic-net.jp/eng
Information in this catalog is subject to change without notice.
Printed in Japan