Nohken VQ20-R00 User manual

ＴＳ０２－１０００１５
ＩＮＳＴＲＵＣＴＩＯＮ ＭＡＮＵＡＬ
FOR
TUNING FORK LEVEL SENSOR
MODEL: ＶＱ２０
Revision 2020-01-08

- ADD 1 -
Read this manual carefully for safe usage.
・This manual applies to general purpose equipment. For equipment intended for
use in potentially explosive atmospheres, see applicable manuals.
・This manual contains important information on handling, inspection and
operation of the equipment indicated on the cover page. Before handling the
equipment, read this manual carefully.
・Instructions in documents submitted by Nohken or its representative have
higher priority than those in this manual.
・Keep this manual within easy access.
・Depending on environment, the equipment may not satisfy specifications
shown in this manual. Check the application conditions carefully beforehand.
・Please contact our sales office for any questions or comments about the
equipment or this manual. Sales offices are shown on the back of the manual.
Safety Symbols:
WARNING Means a potentially hazardous situation which,
if necessary precautions are not observed, can result
in death, serious injury and/or considerable material
damage.
CAUTION Means a hazardous situation which, if necessary
precautions are not observed, can result in minor or
moderate injury or damage to the device.
Means prohibited actions.
Means mandatory actions.

- ADD 2 -
WARNING
This equipment is NOT intended for use in potentially hazardous
atmospheres. Never use it where flammable gas or vapor may be
present. Failure to observe this may result in ignition of flammable
gas or vapor, causing disaster.
Do not alter or disassemble the equipment, unless you have been
instructed to do so by Nohken or its representative.
Failure to observe this may result in:
- malfunction of or damage to the equipment or connected devices;
- ignition;
- electric shock or user injury.
Turn off the equipment before wiring or inspection. Otherwise
leakage or short circuit may cause ignition or electric shock.
After wiring is complete, always check for its correctness. Wrong
wiring may cause:
- damage to or malfunction of the equipment or connected devices;
- ignition;
- electric shock or user injury.
Turn off the equipment immediately in case smoke, unusual smells
or sounds are noticed. Do not supply power until problems are
solved.
CAUTION
Handle the equipment with care. Do not drop, throw, or give
a strong shock to avoid damage.
Observe operation conditions specified in the manual. Use outside
the specified conditions may result in malfunction of or damage to
the equipment or connected devices, ignition, user injury, or
electric shock.
Perform operation tests before actual application to ensure
performance. Install back-up instruments based on different
technologies if failure of this equipment is expected to result in
a serious incident.

- ADD 3 -
CAUTION
Check carefully for chemical compatibility of materials of
construction before installation.
Use the flange, thread or somewhere close to the process
connection to handle the equipment. Do not use the terminal box
(housing) to avoid dropping the equipment, and resultant damage
to the equipment or user injury.
Equipment 50cm or longer:
Lay the equipment when not in use. Otherwise it may fall and
damage itself or things around it, and cause user injury.
Always connect the protective terminal inside the housing
to the ground. (Grounding resistance: 100Ωmax.)
Otherwise leak may occur to cause electric shock
when error occurs.
When connecting to inductive or lamp loads:
Ensure the maximum voltage/current ratings will not be exceeded
to avoid damage to the relay contacts.
Use lightening arrestors or surge absorbers to prevent:
- malfunction, damage, or ignition of the equipment and connected
instruments;
- electric shock or injury.

- ADD 4 -
INTRODUCTION
A) This manual applies to standard models. Please note that information in
this manual may not be applied to customized versions.
B) We are willing to help customers select a suitable model or provide
information about chemical compatibility of materials used, but the
customer is responsible for the decisions made.
C) We always welcome suggestions and comments about this manual.
Please contact our sales office when you have questions or comments.
D) Component replacement:
The equipment design is regularly reviewed and improved. The same
components therefore may not be available when replacement is required.
In such cases, different components or products may be supplied. Please
contact our sales office for detail.
E) The contents of this manual are subject to change without prior notice as
a result of improvement of the equipment.
WARRANTY & DISCLAIMER
A) Nohken warrants the equipment against defect in design or material, and
workmanship for a period of one (1) year from the date of original
shipment from Nohken’s factory.
B) Nohken will not assume liability for loss nor damage resulting from the
use of the equipment.
C) Nohken will not assume liability for damage resulting from:
C-a) not observing instructions in this manual;
C-b) installation, wiring, operation, maintenance, inspection, or storing in
a manner not outlined in this manual;
C-c) unauthorized alterations and repairs;
C-d) the use of or replacement with components not provided by Nohken;
C-e) devices or instrument other than those manufactured by Nohken;
C-f) the use not described in Chapter 1 Purpose of Use of the manual;
C-g) force majeure including, but not limited to, fire, earthquake, tsunami,
lightning strike, riot, commotion, war, armed conflict or terrorist
attack, radioactive pollution, act of God, governmental decisions or
actions, and compliance with laws and regulations.
THE PROVISIONS OF THIS SECTION DO NO LIMIT YOUR LEGAL RIGHTS.