HITROL HTM-20N Series User manual

HTM-20N 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. : [phone]
FAX. : [phone]
www.hitrol.com
INSTRUCTION MANUAL
VIBRATION TYPE LEVEL SWITCH
HTM-20N Series
Doc. no. : HTM20N_IM_Eng_Rev.3.2
Issue date: 2020. 09

HTM-20N Series
HITROL CO., LTD. 2
You should be careful where CAUTION is marked to carry
outthework.
You should be well-informed of the contents where
WARNING is marked before carrying out the work.
.
You should be aware of where NOTICE is marked to carry
outthework.
Table of Contents
Overview ·····························3
Characteristics ·····················3
Operating Principle and Appearance ······3
Specifications ····················4
Dimensions ·······················5
Weather-proof Version (PBT) ·············5
Weather-proof Version (AL.C) ············6
Attachment and Precautions ·········7
Installation on Side (Horizontal) ············7
Installation on Top (Vertical)···············7
Technical Data ··················8
Use ··························9
Maintenance ··················9
Failure Check ·················9
Precautions for Removal ···········9
Precautions for Installation ·········10
Precautions for Transportation and Assembly ···10
Precautions for Lead-In Method of External Wiring
(Ex-proof) ·················10
Precautions for Grounding (Ex-proof) ·····10
Safety and Environment ···············11
Marking ····························11
User Training ···················11
Warranty and Contact ··················12
APPENDIX
APPENDIX O ········HTM-20N Setting Guide
APPENDIX H ····Serial USB Terminal Install Guide

HTM-20N Series
HITROL CO., LTD. 3
Overview
Characteristics
Operation
Principle and
Appearance
A certain level of electric signal is transferred to the piezo sensor so as to vibrate the
tuning fork. The vibration of the latter is reduced when it comes in contact with the
subject. As such, the electric signal is reduced to stop the oscillation of the piezo sensor.
The electric signal is detected by the electronic circuit to operate the relay, so that the
state can be detected with the contact output.
■Level of different powder types can be detected.
■It can measure powder particles, ranging from small to large.
■The membrane is made of stainless steel with a solid structure and a high bearing capacity.
■The wiring is simple.
■It is customizing with the key button.
■It has a simple structure for easy maintenance.
■It has Ex-proof and Dust-proof structures. (HPV-Series)
The HTM-20N Series is a tuning fork type vibration level switch that consists of one
membrane and two stainless forks to detect powder and output the state using the
relay contact, which is applicable for alert and process control.
CABLE ENTRY
HOUSING
CONNECTION
SCREW or FLANGE
TUNING FORK
M-20N Module

HTM-20N Series
HITROL CO., LTD. 4
Specifications
Model
HTM-20N-A
HTM-20NH-A
HTM-20N-B
HTM-20NH-B
HTM-20N-C
Mounting
Screw
Screw, Flange
Max. Temperature
80℃
120℃
80℃
120℃
60℃
Max. Process Pressure
10kg/㎠
2kg/㎠
Power Source
AC 90V~240V, 50/60Hz (Std.) / DC +24V (Opt.)
Output Signal
DPDT
Enclosure
Weather-Proof, IP65
Wetted Part Material
SCS 14
SUS 304+SCS 14, SUS 316L+SCS 14
Process Connection
PT 1-1/2”(M)
PT 1-1/2”(M) (Std.), 2”Flange
Housing ; Cable Entry
PBT (Opt. AL.C) ; 2-PF 1/2”(F) (Std.)
Installation
Side
Side & Top
Top
Contact Rating
AC 250V, 5A / DC 30V, 5A
Item
Specification
Module
M-20N
Microprocessor
16Bit Microprocessor
Power Consumption
AC
Stand-by
AC110 @ 4.8W / AC220V @ 9W
Active
AC110 @ 5.6W / AC220V @ 9.8W
DC
Stand-by
DC+24V @ 1.5W
Active
DC+24V @ 2.3W
Oscillation Frequency
85Hz @ ±5Hz
Sensitivity Resolution
0.1V
Function (Adjustment)
Sensitivity
Relay Delay
Relay Return Time
Relay Contact Control (Normal/Reverse)
Relay Contact Out Control
Normal Close @ Default
Status Indicator
Bi-Color LED [Green / Red / Orange]
Detection Indicator
Red LED
Relay Control Indicator
Green LED
Dimension
80mm x 65mm x 54mm
UART
Monitoring
Ambient Temperature
-20℃~ 80℃
Product Spec.
Electrical Spec.

HTM-20N Series
HITROL CO., LTD. 5
Dimensions Weather-proof Version (PBT)
HTM-20N-A
HTM-20N-B
HTM-20N-C
<Screw Type>
<Flange Type>
HTM-20N-B
HTM-20N-C

HTM-20N Series
HITROL CO., LTD. 6
Weather-proof Version (AL.C)
HTM-20NH-A
HTM-20NH-B
HTM-20N-C
<Screw Type>
<Flange Type>
HTM-20NH-B
HTM-20N-C

HTM-20N Series
HITROL CO., LTD. 7
The HTM-20N Series is installed on the top or the side of a container and silo to detect the
upper or the lower limit, respectively. The level switch can be installed on any material, so it
is applicable to ferrous or nonferrous tanks and silos.
When installing this product, considering the following:
Installation on Side (Horizontal)
■A-Type or B-Type can be installed on the side of a tank. A screw-socket shape under
24mm shall be used for installing the A-Type on the side. Otherwise, dust or foreign
matter may enter, resulting in a malfunction. The extended B-Type supports the screw
and the flange.
■When side installation, it shall be installed slopingly (more than 15°) with a direction of
wider side of tuning fork vertically to avoid build-up of the medium on the tuning fork.
(Refer to Fig. 1)
■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 by falling medium if it is installed
at the inlet. (Refer to Fig. 1)
■Cable lead-in inlet shall be installed facing the ground as shown in the figure. (Refer to Fig. 1)
■Sun cover shall be installed to protect the housing from the damage by direct sunlight. (Refer to Fig. 1)
When installing the product, install it using a tool that fits the hexagon connector of
the screw.
Max. Length shall be 500mm or less for a side installation.
Installation on Top (Vertical)
■Use the B-Type and the C-Type for installation
on top of a tank or silo. Both B-Type and the
C-Type can be installed with the socket or
flange on top.
■Sensor shall be installed at the place far
from inlet of the tank.
■Sun cover shall be installed to protect the
housing from the damage by direct
sunlight. (Refer to Fig. 1.)
Attachment
& Precautions
SUN COVER
PROTECTOR
<Fig. 1>

HTM-20N Series
HITROL CO., LTD. 8
Technical
Data
Bulk Density Particle Density 0.2g/cm3 HTM-20N Series
Max. Mechanical Load 400N (1kgf=9.8N) HTM-20N-A / HTM-20N-B
(For stacking heavy subjects,
use a protection cover.)
Max. Tractive Force 500N HTM-20N-C
Max. Process Pressure Up to 10kg/㎠(150#) HTM-20N-A / HTM-20N-B 최대
Up to 2kg/㎠HTM-20N-C
Relative Humidity Good for 0~100％
(Ratio between the vapors in the air
and that required for saturation at
the same temperature)
Ambient Temp. (Housing) -20 ~ +60 ℃HTM-20N Series
Process Temperature MAX. 80 ℃HTM-20N-A / HTM-20N-B
공정온도(Process temperat ure) MAX. 120 ℃ HTM-20NH-A / HTM-20NH-B
공정온도(Process temperature) MAX. 60 ℃HTM-20N-C
ⓐ
ⓑ
ⓐ
ⓒ
T amb.
T process
120℃
80℃
T amb.
T process
60℃
ⓒ
ⓐⓑ
60℃

HTM-20N Series
HITROL CO., LTD. 9
Turn off the power of the product for maintenance.
Use
Maintenance
Failure Check
Precautions
for Removal
If there is a problem with operation, check the following first.
■Is power voltage connected correctly?
■Is power voltage supplied according to specifications correctly?
■Is output contact wiring correctly?
The main inspection parts of the vibrating level switch are divided into the sensor and
transmission parts. The life span of the major components depends on user’s
environment and can be used in optimal condition through periodic checks. Therefore,
the user shall check and maintain at least once a year. Inspection of the appearance of
the product shall be visually checked to see if there is any damage, and the attachment
of the medium or foreign substances to the sensor will make it worse, so they shall be
removed regularly.
- Remove any sticky object from the device when cleaning 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.
- It may cause sensor error and malfunction, so conduct a regular water-proof check.
- When measuring sticky material, check if such material grows. Remove them regularly if
any should appear. The sticky material may cause malfunction and damage to the
device.
■Check the level and presence of liquid in the tank before removing it.
■Overheated product may cause burn, so wear gloves to remove it.
■It there is explosive gas in the atmosphere, do not open the cover.
■Remove it with the power disconnected.
■Make sure that any o-ring or gasket is not damaged while opening or closing the cover.
The level switch that prevents the vibration of the tuning fork is good for most of the
materials, but the following need to be taken in consideration.
■Max. Ambient Temperature
■Max. Pressure
■Max. Particle Size
■Vibration

HTM-20N Series
HITROL CO., LTD. 10
Please do not apply high impact to the product.
Make sure to insert a washer if the terminal lug is removed from ground
terminal and then re- connected. (Loosening prevention)
Precautions
for Installation
Precautions
for Transportation
& Assembly
Precautions
for Lead-in
Method of
External Wiring
(Ex-proof)
Precautions
for Grounding
(Ex-proof)
■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.
- The grounding has an external and an internal grounding. When connecting to an external ground, the
ground wire shall be 4㎟(4mmSQ). (Internal Grounding is connected and shipped by the
manufacturer.)
External Grounding
4㎟(4mmSQ)
Outside of Head (PBT)
Outside of Head (AL.C)
■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 gaskets between flanges. (Select the gaskets in consideration of the
temperature of the content and the pressure inside the container.)
■Install an ex-proof product in an ex-proof zone.
■Do not bend or extend the sensor that vibrates.
■Make sure to install the product and the cover before supplying the power.
When installing the product, use the tool to tighten it.
- Use the cable gland connection or metal pipe line lead-in on the wire inlet, and use a
product with equivalent Ex-proof certificate to connect it with the external line lead-in
method.
- For non-use external wire inlet, use a closed plug that passes safety certificate above
equivalent performance with the product.

HTM-20N Series
HITROL CO., LTD. 11
Do not apply the Non Ex-proof product in an Ex-proof zone.
The Ex-proof product can be used where the environment and liquid inside the containers
are of zone 1 and 2
Safety and
Environment
Marking
User Training
The above matters shall be fully understood, and the temperature of fluids in the
container where the product is used shall not exceed 80℃in the case of general
types and 120℃in the case of high-temperature types. In addition, make sure that the
ambient temperature of housing is kept at -20℃~ +60℃. (However, C-Type sensor’s the
fluid temperature of the container is limited to 60℃.)
An Ex-proof product is a pressure-resistant and Ex-proof type, so never open the cover during
operation. Ex-proof products are designed according to Article 34 of the Industrial Safety and
Health Act and Article 58.4 of the Enforcement Rules of the same Act.
■Precautions for Use
- Make sure to connect the product and vessel using required tools for sure.
- Keep the lock key safe and make sure that it is locked.
- Do not apply high impact to the product.
■Precautions for Wiring
- Make sure to wire contacts correctly.
- Internal ground (inside product housing) and external ground shall be connected.
- Wire and supply the power to the product after checking the specifications.
- Incorrect power voltage may cause damage to the product.
- Pay attention to prevent electric shock.
■Disposal of Product
- Make sure to separate the amplifier and main unit from housing before disposing
the products. Also, the amplifier shall be detached and discard the metal and non-
metallic materials. No part (ex. Mercury switch) has influence on the environment,
so no special attention is required.
■Product Identification
- The product identification mark is attached onto 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 products.

HTM-20N Series
HITROL CO., LTD. 12
Warranty and
Contact
■Warranty and Service
This product is subject to the warranty for 2 years of shipment and unpaid service will
be provided for any damage found under normal operating conditions. If it is not
about the failure of product, the service charge will be payable.
You can request A/S at our website or by contacting our headquarters.
■Headquarters ․Factory ․Laboratory Contact Number
ADRESS : HITROL CO., LTD 141, Palhakgol-gil, Jori-eup, Paju-si, Gyeonggi-do, Korea
T E L : 031-950-9700 (Headquarters & A/S)
F A X : 031-943-5600 (Headquarters & A/S)

HTM-20N
Setting Guide
Tuning Fork Type Vibration Level Switch
Doc. no. : Rev0.0
Issued Date : 2020.08.31
APPENDIX O

1. M-20N Configuration and Function
No.
Configuration
Function
1
SEN.
■Sensitivity Adjustment
2
DT.
■Relay Delay Time Adjustment
○Time Range: 0.5s, 1s ~ 10s @ Adjustment 0.1s
3
RT.
■Relay Return Time Adjustment
○Time Range: 0.5s, 1s ~ 10s @ Adjustment 0.1s
4
Fail Safe Mode
■Relay Transformation Adjustment
○N.C ↔N.O
5
DET.
■Measurement Status LED
○OFF →Red
6
RLY.
■Relay Status LED
○N.C: OFF →Green
○N.O: Green →OFF
7
PWR
■Power & Status Display
8
UART
■M-20N Status Display Communication Port
9
Power
■Power (AC / DC)
10
Relay Out
■Relay Contact Out (DPDT)

2. M-20N Setting & Adjustment
■Initialization Setting Method
□After installing it on the tank, set it to the initial state for quick response.
■Tuning Setting 1
□The reference setting method according to the “Initialization Setting Method”.
No.
Function
Method
1
Vibration Frequency Tuning
■The SEN. VR status is the most sensitive according to the “Initialization
Setting Method”.
■Keep this status for sensitive use
[Initialization Setting Status]
Relay Delay Time: 0.5s
Relay Return Time: 0.5s
SEN. : 0
Fail Safe Mode (NC)

■Tuning Setting 2
□How to set up when the DET. LED on.
■Sensitivity Adjustment Method
□You can adjust measurement sensitivity for each environment.
No.
Function
Method
1
Vibration Frequency Tuning
■If the DET. LED is on, fine-tune the SEN. VR to the right until the DET.
LED turns off to set the reference value.
No.
Function
Method
1
Tuning Setting Status
■The SEN. VR status is the most sensitive state according to the “Tuning
Setting Method”.
■Keep this status for sensitive use.
2
Sensitivity Adjustment
■You can adjust the sensitivity by adjusting the SEN. VR.
■Sensitivity Adjustment Method
[Before Adjusting SEN. VR]
[After Adjusting SEN. VR]
[SENSITIVE]
[INSENSITIVE]

■Relay Time Adjustment Method
□You can adjust the relay operation time after detecting the measurement.
□You can adjust the relay operation time after not detecting the measurement.
No.
Function
Method
1
DT.
■Relay Delay Time
■Time Adjustmnet Range: 0.5s, 1s ~ 10s @ Adjustment 0.1s
No.
Function
Method
1
RT.
■Relay Return Time
■Time Adjustment Range: 0.5s, 1s ~ 10s @ Adjustment 0.1s
Relay Delay Time
Relay Return Time

■Fail Safe Mode Adjustment Method
□You can adjust the contact status to Relay Contact N.C.
□You can adjust the contact status to Relay Contact N.O.
No.
Function
Method
1
N.C
■Relay Contact Out Default Status
■After detecting the measurement, the contact point changes from N.C →N.O.
■LED Status
No.
Function
Method
1
N.O
■Relay Contact Out Opposite Status
■After detecting the measurement, the contact point changes from N.O →N.C.
■LED Status

3. M-20N UART Monitoring
■Monitoring Method
□You can only check the state of the adjusted setting values using PC or Smartphone.
□The execution method is the same using PC or Smartphone. (Password: 1975)
□Run Screen Component: You can check the sensor measurement status, sensitivity
setting value, relay setting, etc.
■Monitoring Method Using PC
□Component: PC, USB Cable(typical USB to Micro USB B), UART Adaptor.
[M-20N PC UART RUN SCREEN]
[M-20N PC UART Component]
[USB Cable]
Min. Frequency Setting Value for Medium Detection
Max. Frequency Setting Value for Medium Non-detection
Current Measurement Voltage
Sensitivity Setting State Voltage Threshold
Relay Delay Time Adjustments
Relay Return Time Adjustments
Relay Contact Status
Board Temperature

■Monitoring Method Using Smartphone
□Component: Smartphone(Android OS), OTG, USB Cable(typical USB to Micro USB B),
UART Adaptor.
□App: Refer to “Serial USB Terminal Install Guide”
[M-20N Smartphone UART Component]
[USB Cable]
[M-20N Smartphone UART Execution]
[Enter Password]
[Open App]
[Home Screen]
[Select UART Connection]
[M-20N Smartphone UART Exit]
[Select UART Disconnection]
[Exit Program]
[Enter exit command]
[Enter exit and Fly command]
[Run Screen]
[Enter PW and Fly command]