Nagano Keiki KH15 Series User manual

1 TY-KH15-007A Rev.2
User Manual for KH15
Waterproof Pressure Transmitter
KH15-J
□□
/K
□□
7.3

2 Y-KH15-007A Rev.3
FOR PROPER AND SAFE USE
Thank you for purchasing the KH15 waterproof pressure transmitter. To use this product
safely and properly, read this user manual carefully. This is a pressure transmitter that can
support a wide range of cases where components such as liquid or gas are used. Incorrect
use of it causes failures, which may result in damage including faults or accidents.
Keep this manual safely after reading it so that you can always reference it.
■
Definition of Safety Terms
Safety precautions in this manual are categorized based on the following definition:
Indicates the risk that users may suffer from damage
including death or serious injury, and extremely high
urgency at the time of occurrence of risk.
Indicates the risk that users may suffer from damage
including death or serious injury.
Indicates the risk that users may suffer from minor injury
and the risk that only property damage may be caused.
■
Description of Graphic Symbols
Graphic
symbols
Meaning
●Generally prohibited activities
Indicates prohibited activities in handling the product.
●General instructions
Indicates activities based on instructions that users are forced to
conduct.
●Other information
Indicates precautions, special operating methods, and other
important information.
DANGER
WARNING
CAUTION

3 Y-KH15-007A Rev.3
■
Precautions for Handling Product
●Do not give excessive load, vibration or shock.
Damage to the product and release of a measured object may
be caused, which results in injury or damage to the
surrounding environment.
●Repeated applied pressure shall be within the rated pressure
range and shall not exceed the maximum allowable pressure.
Damage to pressure elements may be caused, which results in
injury or damage to the surrounding environment.
●Do not use this product for measured objects corrosive to
wetted materials and gas contact parts.
●This product does not have an explosion-proof structure.
Do not use the product in dangerous places with combustible
gas or liquid which may cause ignition or explosion.
●Do not use non-designated batteries and power supply.
Use of them causes failures, fires, or electric shocks.
●If failures or malfunctions of this product may threaten human
life directly or cause harm to human bodies, do not use the
product.
●Do not modify the product. Disassembly or modification of the
product, or modification to add new functions may cause harm
to human bodies.
●Use the product within the operating temperature range.
Otherwise, the product fails or is damaged, which causes injury
or damage to the surrounding environment.
●Conduct wiring correctly according to the wiring label or the
wiring procedure described in the user manual.
Incorrect wiring may cause failures or fires.
●When the measuring fluid is oxygen, use a degreased product.
Oil may remain within general products. Oil reacts to oxygen,
which causes the risk of ignition or explosion.
●Install the product according to the installation procedure
described in the user manual.
●Contact us for repair. Disassembly or modification of the
product on your own may cause failures.
* These precautions are selected from our common safety precautions for all products that correspond to
this product. KH15-specific precautions are further described in detail in the following sections.
WARNING
CAUTION

4 Y-KH15-007A Rev.3
TABLE OF CONTENTS
FOR PROPER AND SAFE USE ...................................................2
■
Definition of Safety Terms......................................................................................2
■
Description of Graphic Symbols ...........................................................................2
■
Precautions for Handling Product.........................................................................3
TABLE OF CONTENTS ................................................................4
1. INTRODUCTION.......................................................................6
2. PRODUCT OVERVIEW.............................................................6
■
2.1 Overview.............................................................................................................6
■
2.2 Operating Principle...........................................................................................6
3. MODEL NUMBER CONFIGURATION ......................................7
4. SPECIFICATIONS.....................................................................8
■
4.1 Product Specifications .....................................................................................8
5. DIMENSIONS............................................................................9
■
5.1 KH15-J
□□
(small terminal box).....................................................................9
■
5.2 KH15-K
□□
(large terminal box)...................................................................10
6. TRANSPORTATION AND UNPACKING.................................11
■
6.1 Precautions for Transportation...................................................................... 11
■
6.2 Precautions for Unpacking ............................................................................ 11
7. INSTALLATION AND REMOVAL............................................11
■
7.1 Installation........................................................................................................ 11
■
7.2 Precautions for Possible Water Sprinkling..................................................12
8. WIRING AND CONNECTION..................................................14
■
8.1 Wiring................................................................................................................14
■
8.2 Waterproofness of Wire Inlet .........................................................................16
■
8.3 Wiring Diagram and External Connection....................................................17
9. OPERATION (ENERGIZATION)..............................................18
10. MEASURES AGAINST NOISE .............................................18
■
10.1 Effects of Noise.............................................................................................18

5 Y-KH15-007A Rev.3
11. STORAGE.............................................................................19
■
11.1 Precautions for Storage................................................................................19
12. MAINTENANCE....................................................................19
■
12.1 Periodical Inspection....................................................................................19
■
12.2 Adjustment.....................................................................................................20
13. PRODUCT WARRANTY/ EXPORT ADMINISTRATION REGULATIONS
.............................................................................................22
■
13.1 Product Warranty ..........................................................................................22
■
13.2 Export Administration Regulations.............................................................22
14. OTHERS ...............................................................................22

66 TY-KH15-007A Rev.3
TY-KH15-007A Rev.2
1. INTRODUCTION
Check the specifications of the delivered model. Incorrect pressure range, power supply or output will
cause an accident. Make sure to use a model of the designated specifications in a location that meets
your use conditions and that it is properly wired and installed.
2. PRODUCT OVERVIEW
This chapter describes the overview, characteristics, and operating principle of the product.
■
2.1 Overview
This is a compact, robust and waterproof pressure transmitter that uses a semiconductor strain
gauge in a pressure detection part. Standard output is 4 to 20 mADC, 0 to 5 V DC, and 1 to 5 V DC. It
has a terminal box provided with a circuit, which allows you to adjust a zero point and span by
removing the lid of the box.
■
2.2 Operating Principle
With a pressure receiving part used as a diaphragm, the product converts pressure into strain and
detects the amount of strain with the semiconductor strain gauge. The detection circuit is a full-bridge
type in which all four sides of the bridge consist of semiconductor strain gauges. The bridge circuit
gives an electric signal proportional to the strain, which is then transmitted as direct current or voltage
by signal conversion at the next circuit stage.
2.2.1 Block Diagram
< Figure 2-1 >
.
Stabilized
power source
Output
circuit
Output signal
Pressure P Amplifier
circuit

7 Y-KH15-007A Rev.3
2.2.2 Configuration example of above (4 to 20 mA DC output)
3. MODEL NUMBER CONFIGURATION
This chapter describes the model number configuration.
KH15 - □□□
Seal system
3: O-ring
Type 4: All-welded (SUS630 (17-4PH))
J: Small terminal box 6: All-welded (Co-Ni alloy)
Internal access to adjustment
K: Large terminal box
Internal access to adjustment Thread: 2: G1/4B K: NPT1/4
3: G3/8B L: NPT3/8
4: G1/2B M: NPT1/2
6: R1/8
7: R1/4
8: R3/8
9: R1/2
< Figure.2-2 >
(+)
Amplifier
circuit
Pressure
detecting section
Regulated
circuit
Output
circuit
(-)
+CHECK
(+CH)

8 Y-KH15-007A Rev.3
4. SPECIFICATIONS
■
4.1 Product Specifications
Item Details
Model number KH15-□□3 KH15-□□4, □□6
Pressure sensor seal
system
O-ring type Weld type
Pressure range*1 0 to 0.1, 0 to 0.3, -0.1 to 0 MPa
-0.1 to 0.1, -0.1 to 0.3 MPa -0.1 to 0.5 => -0.1 to 2 MPa 0 to 0.5 => 0 to 120 MPa*7
Maximum allowable
pressure*2 200% of pressure range 200% of pressure range
(150% for 35 and 50 Mpa
120% for 70, 100 and 120 Mpa)
Supply voltage 24 V DC +/-10% or 12 V DC +/-10%, 15 V DC +/-10%
(Only voltage output is selectable).
Output type 4 to 20 mADC(load resistance 500Ω max.)
1 to 5 V DC (load resistance 10 kΩ min.)
0 to 5 V DC (load resistance 10 kΩ min.)
Accuracy (including
linearity, hysteresis and
repeatability) +/-1.0%F.S.
・+/-0.25%F.S.*3
(However, the pressure range is
3.5 to 20 MPa).
・+/-0.5%F.S.
(However, the pressure range is
0.5 to 50 MPa).
・+/-1.0%F.S.
Operating temp. range -20 to 70 °C (non-freezing, non-condensing)*4
Storage temp. range -30 to 80 °C (non-freezing, non-condensing)
Temperature
characteristics
・+/-0.025%F.S./°C with +/-0.25%F.S. accuracy (both zero/ span)
・+/-0.05%F.S./°C with +/-0.5%F.S. accuracy (both zero/ span)
・+/-0.1%F.S./°C with +/-1.0%F.S. accuracy (both zero/ span)
Responsiveness
1 ms or less
Wetted materials
Diaphragm : SUS630 (17-4PH)
Fitting : SUS316
O-ring : NBR (standard)
: EPDM
: Fluorine
: Chloroprene
KH15-□□4
Diaphragm: SUS630 (17-4PH)
Fitting: SUS316
KH15-□□6
Diaphragm: Co-Ni alloy*7
Fitting: SUS316
Thread size G1/4B, G3/8B, G1/2B*7, R1/8, R1/4, R3/8, R1/2,
1/4 NPT, 3/8NPT, 1/2 NPT
(R and NPT threads: for the pressure range of 50 MPa or less).
Weight KH15-J□□ (small terminal box): approx. 220 g
KH15-K□□ (large terminal box): approx. 360 g
Case structure
*5
Equivalent to IP67 (based on JIS C 0920)
CE marking
*6
Applicable standards: EN61326-1:2013 EN61326-2-3:2013
<Table 4-1>
< Table 4-1 >

9 Y-KH15-007A Rev.3
*1 Do not seal the cable end with taping or adhesive during wiring as it will block atmospheric pressure introduced via the cable.
Avoid using a cable with poor ventilation (no clearance within the cable).
*2 Max. allowable pressure is the upper limit of pressure value which may safely be applied to the product and remain in
specification once pressure is returned to the rated range with a couple of times overpressurization for about 10 minutes. Effects
of continuous overpressure are not guaranteed.
*3 Accuracy of +/-0.25%F.S. cannot be guaranteed for the model KH15-□□6 and 0 to 5V DC output.
*4 It will be 0 to 70°C for the pressure range of 0.1 MPa or less. For the wetted part exceeding a temperature of 70°C such as
steam or hot water, be sure to install a pipe siphon or similar device to keep it below 70°C. Also, when measuring
low-temperature fluid such as cold water, please employ preventive measures against condensation.
*5 IP67 waterproof case does not cover the waterproofing of the wiring opening (cable gland (JIS F 8801)).
*6 Indoor power distribution network to connect the product shall not be affected by lightning surge voltage and the switching
transients of the power system.
*7 Pressure range of 120 MPa is guaranteed only when Co-Ni alloy materials and the G1/2B fitting are combined.
5. DIMENSIONS
■
5.1 KH15-J
□□
(small terminal box)
< Figure 5-1 >
22 X 25.4 HEX.
(Unit: mm)

10 Y-KH15-007A Rev.3
■
5.2 KH15-K
□□
(large terminal box)
< Figure 5-2 >
22 X 25.4 HEX.

11 Y-KH15-007A Rev.3
6. TRANSPORTATION AND UNPACKING
■
6.1 Precautions for Transportation
(1) Do not apply vibration as much as possible in transporting the product, as is the case with other
electric meters.
(2) Never hit or drop the product.
■
6.2 Precautions for Unpacking
(1) Check the appearance of the carton before unpacking.
(2) Be careful not to roughly handle the package during unpacking.
(3) After unpacking, remove the product from the package in a sufficiently wide area to avoid the
product from being accidentally dropped.
(4) Check the product surface to see if there is any damage and the product label to see if the model
number and the range are exactly what you ordered.
(5) In case of any anomaly, contact sales agent or our sales office.
7. INSTALLATION AND REMOVAL
■
7.1 Installation
(1) Do not tighten the case main unit with a pipe wrench in connecting to a pressure line. Be sure to
use the hex parts of the threads for installation of the product.
(2) Do not install the product in the pressure line with piping filled with liquid. As liquid is
incompressible, tightening the threads produces high pressure, which causes equipment to fail.
When installing the transmitter to the existing pressure line or replacing it with a new one,
remove liquid on the piping connection side, leave an air of approximately 15 to 20 mm, and tuck
the thread.
(3) The product is excellent in vibration resistance. However, avoid violent vibration as it is a
measuring instrument.
(4) The product can be installed in a vertical or horizontal position in forward/backward and right/left
directions.
(5) This product is in a protection class equivalent to IP 65 (JIS C 0920). To ensure a longer life, the
installation location should not be exposed to direct sunlight, moisture, dust, oil or water.
Do not give excessive shock to the product during piping such as
hitting or dropping.
Do not insert a wire into the pressure inlet. The diaphragm is
damaged, causing incorrect behavior.
CAUTION

12 Y-KH15-007A Rev.3
Do not orient glands upward to prevent water from entering via
cables.
Never pull the cable or bend it extremely. Wiring requires great
care so that the self-weight of the cable is not applied to the
product.
Maintenance and adjustment requires enough space in the
surroundings.
When the temperature of the measuring fluid exceeds the
operating temperature range, take heat release measures by
using a cooling system or installing the pipe syphon to mitigate
the effects without introducing the measuring fluid in the KH15
body.
When the temperature of the measuring fluid falls below ambient
temperature (or when you see temperature difference between
the main unit and fluid), take measures against condensation
such as a pipe extension so that the temperature of the
measuring fluid is nearly equal to ambient temperature of the
main unit.
Wind the tape around the tapered male pipe thread to prevent
leakage.
When a straight pipe thread is used, check the packing and seal
surface for dust, contamination or flaws to prevent leakage.
If there is a risk of surge pressure, use the throttle fitting and
dampener.
■
7.2 Precautions for Possible Water Sprinkling
Install the product so that the gland part (cable outlet) faces
downward to prevent water from entering through there as
shown in the figure below (recommended installation direction).
Tighten the gland securely to prevent the intrusion of water (See
“8.1 Wiring”).
When installing the cable, move it down to the bottom first as
shown in the following figure, bend it in a circular pattern a few
times and then install it upward so that water hardly enters or
accumulates inside the cable (move the cable down to the
bottom first before installation regardless of the mounting
orientation).
For installation of conduit, do the same to prevent water from
entering.
CAUTION
CAUTION

13 Y-KH15-007A Rev.3
Atmospheric pressure is introduced into an instrument via the
cable. If the cable is pressed due to a clamp, bush, or extreme
bend in the middle of the cable, or if the cable is long, the
exhaustion of pressure takes time. In this case, an output error
may be caused because of pressure within the case or a change
in temperature. Conduct wiring not to seal the cable end with
tape or adhesive.
Be sure to select and use a transmission cable with an
appropriate outer diameter according to the size of the gland.
Waterproof performance (equivalent to IPX7* (watertight)) is
ensured by using a cable conforming to the gland. Waterproof
performance is also affected by how you tighten the terminal box
lid and install a wire inlet.
Be sure to check the waterproof performance when using
commercially available glands or cable conduits instead of the
supplied gland parts.
Waterproof performance equivalent to IPX7 is guaranteed only
when the components are properly assembled. So, please check
it carefully.
* IPX7 (provision of protecting temporary immersion into water): Submerge the main unit in a tank with a
depth of 1 m for 30 minutes to check that the unit is not flooded (the amount of water causing harmful
effects is not intruded).
< Figure 7-1 Installation direction recommended for possible water sprinkling >
CAUTION
Cable Gland
(Cable outlet)
Downward
Upward

14 Y-KH15-007A Rev.3
8. WIRING AND CONNECTION
■
8.1 Wiring
1) Refer to the table below to obtain a suitable shielded cable.
Model number Terminal opening size
Gasket inner dia.
(mm)
Suitable cable dia.
(mm)
KH15-J-□□
terminal box
(small) G3/8
10a
(standard)
φ7 φ6 to 7
10b φ8 φ7 to 8
KH15-K-□□
terminal box
(large) G1/2
15a φ9 φ8 to 9
15b
(standard)
φ10 φ9 to 10
15c φ11 φ10 to 11
2) Process the end of the cable in accordance with Figure 8-1 and 8-2 below for each model number.
< KH15-J□□ (small terminal box) >
Strip 60 mm of the cable sheath and 7 to 9 mm of the core coat. Provide shielding at the bottom
end of the sheath. Cable that fits the terminal block is AWG24 to 12 (0.2 to 3.3 mm2).
< KH15-K□□ (large terminal box) >
Strip 80 mm of the cable sheath, and then strip the core coat to fit the length of the M3 crimp
terminal to be used. Mount the crimp terminal to the wiring terminal. Provide shielding at the
bottom end of the sheath.
< Table 8-1 >
< Figure 8-2 >
80
7 or less
For M3
< Figure 8-1 >
(60) 7 to 9

15 Y-KH15-007A Rev.3
3) Open the terminal box lid and insert the cable from the terminal opening deep into the gasket (See
Figure 8-3 below).
4) Tighten the gland and seal the terminal opening. (See Figure 8-3 below).
Pass the cable through the gasket and tighten it with the gland
to prevent the intrusion of water.
Use a dedicated tool to peel the coating to avoid damage to the
cable core.
Be careful if the shielded wires do not extend the sheath end
face.
Atmospheric pressure is introduced into an instrument via the
cable. If the cable is pressed due to a clamp, bush, or extreme
bend in the middle of the cable, or if the cable is long, the
exhaustion of pressure takes time. In this case, an output error
may be caused because of pressure within the case or a change
in temperature. Conduct wiring not to seal the cable end with
tape or adhesive. Avoid using the cable with poor ventilation
performance (no clearance within the cable).
Always attach a crimp terminal that fits with the core wire.
CAUTION
CAUTION
< Figure 8-3 >
Cable
Gland Washer
Terminal box lid Terminal block
Terminal opening
Gasket
Terminal box

16 Y-KH15-007A Rev.3
5) Secure the wire to the terminal block.
The recommended tightening torque for KH15-J□□ terminal block: 0.4 N･m
The recommended tightening torque for KH15-K□□ terminal block: 0.5 N･m

Never connect the wires with moisture adhering to the product.
Penetration of moisutre or other substances inside the product
will cause malfunction.
When using a bare crimp terminal, use an insulation tube to
keep necessary insulation distance to avoid the live part
exposure for possible electric shock or short circuit. (see the
figure below).
Be careful not to lose each component during wire connection.
6) Seal the terminal box by tightening the box lid.
Tighten the terminal box lid securely to prevent the intrusion of
water.
■
8.2 Waterproofness of Wire Inlet
Waterproof performance of this product is secured by using the cable with a suitable outer diameter
according to the gland size. Pay enough attention to those actions affecting waterproof performance
such as the tightening of the terminal box lid and installation of the wire inlet. Be sure to check the
waterproof performance when using commercially available glands or cable conduits instead of the
supplied gland parts.
Protection class equivalent to IP67 is guaranteed only when the
components are properly assembled.
CAUTION
CAUTION
Insulation tube
Insulation distance
Live part
CAUTION

17 Y-KH15-007A Rev.3
■
8.3 Wiring Diagram and External Connection
(1) Wiring diagram
(2) Examples of external connection
< 2-wire system (4 to 20 mADC) >
< 3-wire system (1 to 5V DC, 0 to 5V DC) >
KH15 Ammeter to monitor output
+
+CH
-
Power supply
4 to 20 mA DC +24V
0V
Load resistance
< Figure 8-5 >
KH15
< Figure 8-6 >
POWER
OUTPUT
COM.
Power supply
+24V
0V
Terminal block
AWG24 to 12
2-wire system 3-wire system
Terminal block
AWG24 to 12
Terminal
block
M3
Terminal
block
M3
< Figure 8-4 >

18 Y-KH15-007A Rev.3
* When using the same power supply to connect equipment that causes
surge or other phenomena, a varistor or the like should be connected to
protect the transmitter.
Before installation, check the rated value specified for this
product to determine the rated value of the power supply to use.
Internal resistance of equipment to be connected should be
within the rated load resistance of the product.
9. OPERATION (ENERGIZATION)
Before powering on, make sure once again that the correct connections are established and that the
rated voltage/current of the power supply as well as the internal resistance of the externally
connected equipment are within the rated range of the load resistance applied to the product. Then,
power on and wait at least 5 minutes for warm-up before starting a production run.
Observe the following precautions during operation:
Avoid applying pressure equal to or higher than the rated
pressure shown on the product label.
Do not conduct wiring in the power-on state. Failures or electric
shocks may be caused in the product. Follow the wiring diagram
to install the cables.
Before installation, check the rated value specified for this
product to determine the rated value of the power supply to use.
Internal resistance of equipment to be connected should be
within the rated load resistance of the product.
10. MEASURES AGAINST NOISE
■
10.1 Effects of Noise
If intermittent changes in measurement values or output are found, or if pressure values different from
actual ones are indicated, they may be affected by noise. Generally, sources of noise include power
supply, an output cable, peripheral equipment, and wiring. Values may be subject to effects of noise
depending on the installation place or position of the product. When you identify the source and take
the measures below, you can reduce effects of noise.
Radiation noise
• Keep the product away from the source.
• Change the direction of the product toward the source to change an incidence angle to a board.
• Install an electromagnetic shield in the source or the product.
CAUTION
CAUTION

19 Y-KH15-007A Rev.3
Induction noise
• Keep the product away from the wiring carrying high current.
• Keep the product away from electrically charged machines or objects.
Conductive noise
• Use the stable power supply that is difficult to generate noise.
• Install power supply or output measurement equipment in an environment that is impervious to
being affected by noise.
• Use a ferrite core to filter cables.
• Use high-noise-resistant cables such as a shield one for connection to connect the shield to the
ground.
11. STORAGE
■
11.1 Precautions for Storage
Do not store the product in the places listed below. If you do not
observe this instruction, the product will fail or get damaged.
• Locations that are prone to condensation with high humidity
• Locations that may be adversely affected by atmospheric
pressure, temperature, humidity, ventilation, sunlight, dust, salt,
sulfur-containing air or other factors
• Locations subject to inclination, vibration or shock (including
those during transportation)
• Locations where chemicals are stored or gases are generated.
• Locations exposed to direct sunlight or in high-temperature cars
12. MAINTENANCE
■
12.1 Periodical Inspection
A periodical maintenance once a half year will be needed due to possible aging under different
operating conditions. Also, perform calibration as needed. Calibration should be performed in a
specified manner or at a designated calibration laboratory.
Refer to the following checklist for periodic inspections.
< Periodic Inspection Checklist >
・Appearance (flaws, cracks, deformation, and corrosion)
・Corrosion state of the pressure inlet
・Insulation resistance between the case and all terminals tied (100 MΩ or more at 50V DC)
・Leak check and retightening of the threads
・Output check with a reference pressure gauge and a measuring instrument
・Waterproof check and retightening of the cable, gland, and terminal box
CAUTION

20 Y-KH15-007A Rev.3
Current output can be checked with a check terminal (+CH) without
removing any wiring. Use an ammeter with an internal resistance of 10Ω
or less during checking.
Avoid electrostatic charge.
To clean the appearance of the product, use a water-soaked soft
cloth. Do not use thinner and benzine that cause degradation or
failures.
■
12.2 Adjustment
Remove the terminal box lid to adjust the output of this product. When removing the lid, you will see
the plate as shown in Figure 8-7 below. The characters “Z” and “S” printed on the plate are trimmers
for zero and span adjustment respectively.
Do not perform an adjustment when the surface of the product is
wet. Moisture getting inside the product will cause a failure.
Never cause short circuits with a driver (be sure to use a resin or
ceramic driver).
After powering on, wait at least 5 minutes for warm-up in an
energizing state before performing an adjustment.
Care should be taken to prevent excessive load on trimmers.
Otherwise, trimmers (circuit parts) may be damaged.
For adjustment, use the reference pressure gauge and
measuring instrument with traceability ensured.
CAUTION
CAUTION
KH15-J-□□
(current output) KH15-K-□□
(current output)
< Figure 12-1 >
Span trimmer
Zero trimmer
Plate
Zero trimmer
Plate
Span trimmer