HITROL HM-90S Series User manual

HM-90S Series
HITROL CO., LTD. 1
HITROL CO., LTD.
HEAD OFFICE.FACTORY.R&D INSTITUTE
HITROL CO., LTD 141, Palhakgol-gil, Jori-eup
Paju-si, Gyeonggi-do, Korea
TEL. : [phone]
FAX. : [phone]
www.hitrol.com
INSTRUCTION MANUAL
Float Type Level Switch
HM-90S Series
Doc. no. : HM90S_IM_Eng_Rev.0
Issue date: 2021. 09

HM-90S Series
HITROL CO., LTD. 2
You shall be well-informed of the contents
where WARNING is marked before carrying
out the work.
.
You shall be aware of where NOTICE is
marked to carry out the work.
You shall be careful where CAUTION is
marked to carry out the work.
Table of contents
Overview ······················3
Operating Principles ···················3
Characteristics ······················3
Specifications ····················4
Product Components ···················5
Dimensions & Technical Specifications ····6
Switch Specification by Process Temperature ····
································7
Wiring ·······················7
Installation ·······················8
Maintenance ······················9
Failure Check ·······················9
Precautions for Removal ···············9
Precautions for Transportation and Assembly ·····
·····························10
Precautions for Installation ·············10
Precautions for Grounding ·············10
Precautions for Inserted External Wire (Ex-proof)····
·························10
Safety and Environment ···············10
Marking ·························11
User Training ··················11
Warranty and Contact ···············12

HM-90S Series
HITROL CO., LTD. 3
Overview
Operating
Principles
Characteristics
HM-90S Series is a level switch with ON/OFF contact signals to detect upper and lower
limits of vessel. It has a solid structure and high reliability. It is mainly used as a water
level detector for boilers of power plants and refining equipment of petrochemical
plants.
Core
Base
Cooling Fin
(For high temp.)
Cover
Enclosing Tube
Float
Switch Block
When the level of the object to be measured rises, the float also rises due to buoyancy
and, accordingly, the connected core also rises. When the core rises, a switch block
magnet responds to the core so as to trigger the switch.
■ Solid structure and long service life
■ Current operation state display
■ Customizable with special material (alloy)
■ Ex-proof type available (HM-90S-Ex, HM-90SH-Ex)

HM-90S Series
HITROL CO., LTD. 4
Specifications
Weather-Proof
Ex-Proof
※ The housing is designed to avoid damage from dust or water, and if necessary, anti-
corrosion housing (EPOXY Coated) can be selected.
Model
HM-90S
HM-90SH
Process connection
80A JIS 10K RF, Others
80A JIS 10K RF, Others
Ambient Temperature
-20℃~ +80℃
Max. Process Temp.
-40℃to +120℃
-40℃to +200℃
-40℃to +350℃
-40℃to +500℃
Max. Process Pressure
Up to 20kg/㎠(300#)
Up to 20kg/㎠(300#)
Switch Type
Micro Switch
Contact Form
SPDT, DPDT
Enclosure
Weather-Proof (IP65)
Material
Flange
C.S, 304 SS, 316L SS
Chamber
C.S, 304 SS, 316L SS
Float
316L SS
Housing; Cable Entry
C.S; PF 3/4”(F), AL.; PF 3/4”(F)
Installation
Side
Model
HM-90S-Ex
HM-90SH-Ex
Process connection
80A JIS 10K RF, Others
80A JIS 10K RF, Others
Ambient Temperature
-20℃to +80℃
Max. Process Temp.
-40℃to +120℃
-40℃to +200℃
-40℃to +350℃
Max. Process Pressure
Up to 20kg/㎠(300#)
Up to 20kg/㎠(300#)
Switch Type
Micro Switch
Contact Form
SPDT, DPDT
Enclosure
Ex-Proof (Ex d IIC T4, IP65)
Material
Flange
C.S, 304 SS, 316L SS
Chamber
C.S, 304 SS, 316L SS
Float
316L SS
Housing; Cable Entry
AL.; PF 3/4”(F), Others
Installation
Side

HM-90S Series
HITROL CO., LTD. 5
Product Components
HM-90S Series
Float
Aluminum Housing (Weather-Proof, Ex-Proof)
Aluminum Housing + Terminal Box (Weather-Proof)
Carbon steel Housing (Weather-Proof)
Carbon steel Housing + Terminal Box (Weather-Proof)
Wetted Parts
Cover
Base
Cooling Fin
Terminal
Box
Rod
Flange
Chamber
Cap
Cover
Base
Cooling Fin
Terminal
Box

HM-90S Series
HITROL CO., LTD. 6
Dimensions & Technical Specifications
Std. Length L1 / L
Minimum Specific Gravity
150mm / 350mm
0.8
Carbon steel Housing (Weather-Proof)
Float
HM-90 Series
~120℃
~200℃
~350℃/~500℃
~500℃
Aluminum Housing (Weather-Proof)
~120℃
~200℃
~350℃/~500℃
~500℃
Aluminum Housing (Ex-Proof)
~120℃
~200℃
~300℃
~350℃
If the fluid temperature is over 200°C, heat resistance cables for high temperatures shall be applied.
※Based on pressure of 10kgf/cm2, temperature of 120°C, Standard length.
Some tolerances may occur with actual products.
※Unit of Length: [mm]

HM-90S Series
HITROL CO., LTD. 7
Specifications of Temperature and Contact Form (SPDT, DPDT) are optional.
Switch Specification by
Process Temperature
Std. Type
Opt. Type
Process
Temp.
Contact Rating
~ 200˚C
AC 250V, 15A
DC 125V, 0.5A
~ 350˚C
AC 250V, 5A
DC 125V, 0.5A
Std. Type
Opt. Type
Process
Temp.
Contact Rating
+ External Terminal Box
~ 500˚C
AC 250V, 1A
DC 125V, 0.4A
Wiring
- Open the cover and insert the cable into the inlet.
- Connect the cable with COM, N.O, N.C terminal of the switch block as necessary.
Common (COM)
Close on High Level (N.O)
Close on Low Level (N.C)
Common (COM)
Close on High Level (N.O)
Close on Low Level (N.C)
Common (COM)
Close on High Level (N.O)
Close on Low Level (N.C)
■DPDT Wiring
■SPDT Wiring

HM-90S Series
HITROL CO., LTD. 8
Do not insulate the housing and cooling fin.
Installation
- Default connection is a side type.
- According to the dimensions of the drawing, the connection and main unit shall be leveled.
Also, it is recommended to install a bracket to support the product if necessary.
- When installing, the nozzle length shall be checked before installing the product.
- If the temperature of object to be measured exceeds 350℃, an ex-proof product (HM-
90S(H)-Ex) is not applicable.
- If the temperature of object to be measured exceeds 120℃, use a high-temperature
product (HM-90SH, HM-90SH-Ex) and insulate the main unit and connection, as
shown below.
Vessel
HM-90S

HM-90S Series
HITROL CO., LTD. 9
Maintenance
Failure Check
Precautions
for Removal
Regular inspection helps in using the product in the optimal condition. As such, it is
recommended to conduct annual inspection and maintenance.
■ Cage
The cage is designed to endure high temperature, and its safety is confirmed with
nondestructive and water-pressure tests. However, corrosion can lead to leakage in a
harsh working environment. As such, regular visual inspection and test are required.
■ Housing
Check the sealing of the housing cover and wire inlet to prevent dust or rain from
penetrating. Also, replace the sealing if it is old or damaged.
Exposure to excessive heat or humidity may damage the wire inlet insulation. It may
lead to short circuit, so check the wiring and replace it if necessary in advance.
If the terminal is not tightened, vibration may cause it to loosen.
Prepare a spare switch block so that the process can continue even if there is a
problem with the switch block.
The product can be removed from the vessel to check the contact of level switch
using liquid (e.g., water) and then reconfigure it.
For maintenance, check the presence of measure object in the tank and remove it.
Learn how to adjust the switch block first, and contact the headquarters or
dealership for any replacement required.
If there is a problem with operation, check the following first.
■Remove the cover and check if the output of the micro switch works fine.
Connect a tester to COM and N.O or N.C to check the output, and if there is a
problem, replace the micro switch.
■ After checking the micro switch, remove the product from the vessel and move the
float up and down to see if the switch block magnet responds to the core.
■ Recheck if the float and level of object to be measured are leveled.
■ Recheck if the float is positioned on top of the object to be measured.
■Check the level and presence of measure object in the tank before removing it.
■Wear gloves when removing it, to prevent a burn.
■Make sure that any O-ring or gasket is not damaged while opening or closing the
cover of product.
■Unlock the lock key before removing the cover.
■Disconnect the cable before removing the snap switch.
If there is explosive gas atmosphere, do not open the cover.

HM-90S Series
HITROL CO., LTD. 10
Make sure that it is not subject to any high impact when moving the product.
Precautions
for
Transportation
and Assembly
Precautions
for Installation
Precautions
for Grounding
Precautions
for
Inserted
External Wire
(Ex-proof)
Safety and
Environment
■Pay special attention to prevent any impact on the device during transportation or
assembly.
■Pay attention to prevent any damage to any packing when transporting or mounting
the machine to the vessel.
■External ground is located on top of cable entry, and the grounding wire to connect external
ground must be 4㎟(4mmSQ). (Internal ground is connected before shipment.)
■Use the same standard flange or screw.
■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
temperature of content and pressure of vessel.)
■Install an Ex-proof product only in an Ex-proof zone.
Make sure to insert a washer if the terminal lug is removed from the ground
terminal and then re-connected. (Loosening prevention)
■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.
■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.
- Pay attention to prevent electric shock.
■Disposal of Product
- Remove the snap switch of switch block from the housing before disposing a
product.
- No part (ex. Mercury Switch) has influence on the environment, so no special
attention is required.

HM-90S Series
HITROL CO., LTD. 11
Do not apply a Non-ex-proof product in an Ex-proof zone.
An ex-proof product can be used where the environment and liquid inside the
containers are of zone 1 and 2.
Marking
User
Training
■Product Identification
The product identification mark is attached onto the housing and shows the product
name, serial number, working temperature, working pressure, and matters regarding
output. The serial number is a unique manufacturing number for the identification of
products.
Understand the aforementioned and do not exceed 120℃ and 500℃ respectively for the
liquid in the general and high-temperature vessels to use the product. In addition, make
sure that the ambient temperature of housing is kept at -20 - +80℃. (However, Ex-Proof
product is limited to a maximum temperature of 350℃for the liquid in the container.)
Make sure to use high-temperature cables with high-temperature products. (To prevent
damage to the cable). 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.
Weather-Proof Version
(C.S + Aluminum Housing)
Weather-Proof Version
(Aluminum Housing)
Ex-Proof Version
(Certificate No.: 09-AV2BO-0097)

HM-90S 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
ADDRESS: 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)