HITROL HNV-970 Series User manual

HNV-970 Series
HITROL CO., LTD. 1
HITROL CO., LTD.
HEAD OFFICE.FACTORY.R&D INSTITUDE
HITROL CO., LTD. 141, Palhakgol-gil, Jori-eup
Paju-si, Gyeonggi-do, Korea
TEL. : (00)[phone]
FAX. : (00)[phone] ~ 9799
www.hitrol.com
INSTRUCTION MANUAL
Vibration Type Level Switch
HNV-970 Series
Doc. no. : HNV970_IM_Eng_Rev.0
Issue date: 2021. 03

HNV-970 Series
HITROL CO., LTD. 2
Table of Contents
Overview ·····························3
Characteristics ·························3
Operating Principles and Appearance ·······3
Specifications ··························4
Dimensions ····························5
Precautions for Mounting ·················6
Wiring ·······························7
Operating ·····························7
Precautions for Installation ················8
Precautions for Removal ··················8
Safety and Environment ·················8
Maintenance ·······················8
Precautions for transportation & assembly ···8
Failure Check ··························9
Marking ···························9
Warranty and Contact Information ··········9
해당 표시가 있는 부분은 필히 숙지하고
작업을 이행해야 합니다.
해당 표시가 있는 부분은 주의하여 작업을
이행해야 합니다.
You should be well-informed of the contents
where WARNING is marked before carrying
out the work.
You should be careful where CAUTION is
marked to carry out the work.

HNV-970 Series
HITROL CO., LTD. 3
Housing
Cable Entry
Coil
Connector
Sensor
Extension Sensor
Terminal block
Overview
Characteristics
Operating
Principles and
Appearance
A coil which generates a frequency is installed in the housing and it vibrates the sensor
continuously with natural frequency. When the medium is contacted with the sensing
rod, the frequency is becoming low and output is significantly decreased. It is sensed by
the control unit and relay signal is out. It can be generally used for alarm and process
control.
■Various kinds of solid or powder level can be detected.
■Used to detect an Interface level of sediments such as sand and carbon, etc in liquids.
■Long life cycle due to mechanical moveless parts
■Length extension is available.
HNV-970 Series is a level switch which detects powder and liquid in the tank. It is
generally used to detect a contact output after sensing of medium in the tank. In
particular, the HNV-970 series can be used to detect an interface level of sediments
such as sand and carbon, etc in liquids.

HNV-970 Series
HITROL CO., LTD. 4
Specifications
Model
HNV-970
Housing ; Cable Entry
AL.C ; PF 3/4”(F)
Enclosure
Weather-Proof, IP54
Max. Temperature
80℃
Max. Process Pressure
10kgf/㎠(Screw Type)
Mounting
Screw, Flange
Wetted Part Material
316L SS
Process Connection
PT 1”(M)
Installation
Side & Top
Distance
Max. 500m (between sensor and unit)
Model
HLC-970-L
Housing ; Cable Entry
AL.C ; 2-PF 3/4”(F)
Enclosure
Weather-Proof, IP65
Ambient Temperature
-20℃~ +60℃
Installation
Local
Power Source
AC 110V, AC 220V, DC 24V
Contact Form
DPDT
Contact Rating
AC 250V, 5A / DC 30V, 5A
Sensor
Combination Unit

HNV-970 Series
HITROL CO., LTD. 5
Dimensions
HNV-970
HLC-970-L

HNV-970 Series
HITROL CO., LTD. 6
Precautions
for Mounting
For the mounting of vibration level switch, Screw and Flange (ANSI, JIS and DIN) types
are available and installation with various mounting type is available. Below points shall
be considered when installation of the product.
Side Installation (Horizontal Installation)
The product is not much affected by the material build-up on the sensor but it can be sensitive
by shock due to thin sensing part. So, if possible, it is not recommended to install where the
medium is falling down. However, if it is unavoidable to install at the inlet, protector shall be
installed to prevent a sensing part from damage by falling medium.
Top Installation (Vertical Installation)
Special precautions are not required. It is generally used to detect an interface level of
sediment in liquids.
■When side installation, inactive rod shall be exposed min. 50mm at least into the tank
inside and it is recommended to install slopingly (about 15o) against a horizontal line
in order to prevent a malfunction by foreign substance between nozzle and probe.
■Sensor shall be installed at the place far from inlet of the tank and protector shall be
installed in order to protect the sensor from damage.
■When side installation, cable entry shall be installed facing the ground for rain proof.
■When the installation at outside, it is recommended to install a sun cover in order to
avoid an effect caused by temperature rise.
■If there is an agitator in the tank, the probe shall be installed with a safe distance
from the agitator.
Pay more attention for installation to the tank which has a vibration because
it may cause a malfunction.
INTERFACE
Sediment
s
Liquid

HNV-970 Series
HITROL CO., LTD. 7
Wiring
Operating
- Wiring shall be performed after confirming of power source, AC 110V, AC 220V or DC +24V.
- In case of DC power, +, - shall be wired correctly.
- Make sure that wiring shall not be carried out when the power is supplying.
- When wiring of HVN-970 to HLC-970L, use CVVS1.25^2 x 2C cable and maximum
distance between sensor and control unit is 500 meter.
- Power and LOW / MIDDLE SENSITIVITY LEDs are on when the power is supplied. When
the medium is detected, LOW / MIDDLE SENSITIVITY LEDs are off and Relay LED is on.
No need separate setting by user because it is basically set by factory.
- If the setting at the site is newly required, adjust VR1 and VR2 to LEDs to be off and
adjust VR1 until Red LED of LOW SENSITIVITY is on. After that, adjust SPAN to be
detected turning yellow LED on additionally.
Sensor
Control Unit
If frequency is adjusted at the site, it causes a malfunction so make sure to do not set it.

HNV-970 Series
HITROL CO., LTD. 8
Precautions
for installation
Precautions
for Removal
Safety and
Environment
Maintenance
Precautions for
Transportation
& Assembly
■Pay special attention to prevent any impact on the device during transportation or
assembly. The impact may directly lead to failure.
■While transporting or assembling the product on a tank or silo, prevent any damage
to the assembly packing
Please do not apply high impact to the product.
■Check the level and presence of medium in the tank before removing it.
■Overheated product may cause burn, so wear gloves to remove it.
■Remove it with the power disconnected.
■Make sure that any o-ring or gasket is not damaged while opening or closing the cover.
■Maintenance
- Remove a material stuck on the sensor when cleaning of the tank or silo.
- If the medium moves fast or the agitator works in the tank, perform regular inspection to
prevent mechanical damage to the sensor.
- If the measuring medium is so sticky, check if the medium is stuck on the sensor and remove
it periodically.
- The material stuck on the sensor may cause a malfunction and damage to the device.
■Precautions for Use
- Make sure to mount the product to a vessel using required tools for sure as tightly
as possible.
- Do not apply high impact to the product.
■Precautions for Wiring
- Make sure to wire correctly to the terminal of contact. (Refer to wiring method)
- Wire and supply the power to the product after checking of the specifications.
- Incorrect power supplying may cause damage to the product.
- Pay attention to prevent electric shock.
■Connect the flanges or bolts with the same specifications.
■Make sure to insert washers between bolts and nuts to prevent loosening.
■Make sure to insert a gasket between flanges.
(Select the gasket in consideration of the temperature of the medium and the pressure
inside the container.)
■Do not bend the sensor which is a vibration part.
■After installation is completed, make sure to assemble the product cover before
supplying of the power.

HNV-970 Series
HITROL CO., LTD. 9
Failure Check
Marking
Warranty and
Contact
Information
Warranty and Service
The product is subject to the warranty for 2 years after shipment and unpaid service
will be provided for any damage occurred under normal operating conditions. If it is
not about the failure of product, service fee will be charged.
Headquarter․Factory․R&D Institute
Hitrol Co., Ltd.
141, Palhakgol-Gil, Jori-Eup, Paju-Si, Gyeonggi-Do, Korea
Tel. : [phone] (Headquarter and After Sales Service Team)
Fax : [phone] (Headquarter and After Sales Service Team)
■Product Identification
The product identification mark is attached on the housing and shows the model
name, serial number, working temperature, working pressure and matters regarding
output. The serial number is a unique manufacturing number for the identification of
the product.
If the operating does not work normally, check first below points.
■Is the power connection correct?
■Is the power supplying properly in accordance with the specifications?
■Is the wiring for output contact correct?