HITROL HM-90-Ex Series User manual

HM-90&95-Ex 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
DISPLACER & FLOAT TYPE LEVEL SWITCH
HM-90&95-Ex Series
Doc. no. : HM90&95-Ex(IECEx)_IM_Eng_Rev.0
Issue date : 2019. 11

HM-90&95-Ex 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
Features ······························3
Applications ···························3
Operating Principles ·····················3
Switch Action ···························4
Specification ···························6
Components ··························7
Dimensions and Detailed Technical Specifications ·
·····································10
Process temperature Switch specification ····10
Detail Dimensions ·····················11
Wiring ······························13
Installation ··························13
Maintenance ·························14
Failure Check ·························15
Cautions for Removal ··················15
Transportation and Cautions for Assembly ···15
Cautions for Installation ·················15
Cautions for Grounding ·················15
Cautions for Inserted External Wire ········16
Safety and Environment ···············16
Marking ····························16
Product Notation ·····················17
User Training ······················18
Warranty and Contact ··················18

HM-90&95-Ex Series
HITROL CO., LTD. 3
Overview
Features
Applications
Operating
Principles
■ Solid structure and long service life
■ Applicable in high temperature and pressure
■ Current operation state display
■ Customizable with special material (alloy)
■ Pressure-resistant and ex-proof type available
■ ASME B31.1, ASME B31.3 (If chamber design is required.)
HM-90&95-Ex Series is a level detector with ON/OFF contact signals to detect upper and
lower limits of vessel. It is firmly designed to be used in high temperature and pressure with
excellent reliability. It is mainly used as a water level detector for boilers of power plants and
refining equipment of petrochemical plants.
HM-90 Series is installed on top of tank or connected chamber and works with buoyancy of displacer and
tension of spring. If the displacer is submerged when the level of measure object rises, it becomes lighter
because of the buoyancy, where the spring that was compressed by the weight of displacer is released so the
core rises within the enclosing tube. The magnet which is connected with the switch responds to trigger the
switch when the core rises.
■Feedwater heaters ■Steam drums
■Condensate drip Pot ■Flash tank
■Separators ■Receivers
■Accumulator
Displacer
Chain(wire)
CORE
ENCLOSING TUBE
Base
Cover
Spring Holder
Extension
Spring

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Core
Enclosing tube
Socket
Cage
Pivot
RISING LEVEL
Switch Action
The core rises within the enclosing tube because of buoyancy when the level of measure object
rises and the displacer is submerged. The magnet which is connected with the switch responds to
trigger the switch when the core rises.
MAGNET
SNAP SWITCH
CORE
ENCLOSING TUBE
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.
Base
Cover
Float

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Core
Micro Switch
Magnet
Enclosing Tube
When the level of the object to be measured rises, the core also rises and switch block
magnet responds to the core so as to trigger the switch.
When the level of the object to be measured is lowered, the core rises and the switch
block magnet responds to the core so as to trigger the switch.

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Specification
Model
HM-90-Ex
HM-90H-Ex
Process connection
80A JIS 10K RF (Std.)
Ambient Temperature
-20℃to +60℃
Max. Process Temp.
-40℃to +75℃
-40℃to +120℃
-40℃to +190℃
-40℃to +285℃
-40℃to +435℃
Max. Process Pressure
Up to 63kg/㎠(900#)
Switch Type
Micro Switch
Contact Form
SPDT, DPDT
Contact Rating
(Maximum)
AC 250V, 15A / DC 125V, 0.5A
AC 250V, 5A / DC 125V, 0.5A
AC 250V, 1A / DC 125V, 0.4A
Enclosure
Ex-Proof
(Ex d IIC T6/T4 Gb)
Ex-Proof
(Ex d IIC T3/T2/T1 Gb)
Material
Displacer
304, 316L
Chamber
C.S, 304, 316L, Other
Housing; Cable Entry
AL; PF 3/4”(F) (Std.)
Installation
Top
Model
HM-95-Ex
HM-95H-Ex
HM-95V-Ex
HM-95VH-Ex
Process connection
100A JIS 10K RF (Std.)
1”Socket (Std.)
Ambient Temperature
-20℃to +60℃
Max. Process Temp.
-40℃to +75℃
-40℃to +120℃
-40℃to +190℃
-40℃to +285℃
-40℃to +435℃
-40℃to +75℃
-40℃to +120℃
-40℃to +190℃
-40℃to +285℃
-40℃to +435℃
Max. Process Pressure
Up to 63kg/㎠(900#)
Up to 105kg/㎠(1500#)
Switch Type
Micro Switch
Contact Form
SPDT, DPDT
Contact Rating
(Maximum)
AC 250V, 15A / DC 125V, 0.5A
AC 250V, 5A / DC 125V, 0.5A
AC 250V, 1A / DC 125V, 0.4A
Enclosure
Ex-Proof
(Ex d IIC T6/T4
Gb)
Ex-Proof
(Ex d IIC
T3/T2/T1 Gb)
Ex-Proof
(Ex d IIC T6/T4
Gb)
Ex-Proof
(Ex d IIC
T3/T2/T1 Gb)
Material
Float
316L
Cage
Opt.
C.S, 304, 316L, Others
Housing; Cable Entry
AL.; PF 3/4”(F), Other
Installation
Top
Top and Bottom, Side to side

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Components
HM-90-Ex Series
Wetted Parts
Aluminum Housing (Ex-Proof)
Displacer
Flange
Displacer
<Standard>
<Protection Tube>
<Side to Side>
Cover
Base
Cover
Base
Cooling Fin
Displacer
Process Conn.
Flange
Flange
Flange
Spring Holder
Spring Holder
Spring Holder
Chain
Wire
Wire
Guide Pipe
Chamber
Extension
Spring
Extension
Spring
Extension
Spring

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HM-95-Ex Series
Drain Parts
Wetted Parts
Float
Cage
Cage
Flange
Flange
Flange
Ball Valve
Plug
Gate Valve
Globe Valve
Float
<Standard>
<Side to Bottom>
<Side to Side>
Cover
Base
Cooling Fin
Socket
Socket
Process Conn.
Flange
Float
Aluminum Housing (Ex-Proof)
Cover
Base
Cooling Fin

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HM-95V-Ex Series
Float
Socket
Cage
Drain Valve
Tee
Elbow
Socket
Vent Valve
Double Vent
Valve
Wetted Parts
Plug
Double Drain
Valve
Cover
Base
Cooling Fin
Aluminum Housing (Ex-Proof)

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Specifications of Temperature and Contact Form (SPDT, DPDT) are optional.
Dimensions and Detailed Technical Specifications
Ex-Proof Version
The unit of length is expressed in mm.
Process temperature
Switch specification
공정온도
SWITCH 사양
~120℃
AC 250V, 15A
DC 125V, 0.5A
~190℃
AC 250V, 15A
DC 125V, 0.5A
~285℃
AC 250V, 5A
DC 125V, 0.5A
~435℃
AC 250V, 1A
DC 125V, 0.4A
Float Size
Minimum Specific Gravity
Ø94
0.8
Ø114
0.5
Float Size
Minimum Specific Gravity
Ø94
0.8
HM-95 Series
HM-95V Series
※Based on pressure 10kgf/cm2, temperature of 120℃, Std. Length.
HM-95 Series Float

HM-90&95-Ex Series
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Some tolerances may occur with actual products.
Detail Dimensions
The unit of length is expressed in mm.
1F
2F
3F
4F
Guide Pipe Version
Chamber Version
HM-90-Ex Series
Contact composition

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Some tolerances may occur with actual products.
The unit of length is expressed in mm.
HM-95-Ex Series
HM-95V-Ex Series

HM-90&95-Ex Series
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Wiring
Installation
Default connection is Top type, but it is customizable to Side to Side or Side to Bottom.
According to the dimensions of the drawing, the connection and main unit must be leveled.
Also, it is recommended to install a bracket to support the product if necessary.
Prevent the heat of content from being transferred to the instrument when installing the product.
First of all, remove the product housing cover for wiring.
After that, connect the wires to COM, N.O, and N.C terminals of switch block.
The housing is designed to prevent damage from dust or water, and if necessary,
anti-corrosion (Epoxy Coat) housing is optional.
COMMON(C)
Normal Open(NO)
Normal Close(NC)
COMMON(C)
Normal Open(NO)
Normal Close(NC)
DPDT wiring
SPDT wiring
COMMON(C)
Normal Open(NO)
Normal Close(NC)
Internal circuit
1
2
3
Vessel
Isolation
Valve
Isolation
Valve
Vessel
HM-95-Ex
HM-95V-Ex
300~600
300~600

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For maintenance, check for the presence of the object to be measured in the tank first.
Learn how to adjust the switch block before adjusting it, and contact the headquarters or
dealership for any replacement required.
Maintenance
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 pressure, 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.
Do not insulate the housing and cooling fin.
-Check Ex-proof rating and fluid temperature before applying an Ex-proof product. If the
temperature of measure object exceeds 350˚C, cannot use an Ex-proof type product.
-If the temperature of measure object exceeds 120˚C, use a high-temperature product, and
insulate the main unit and connection as shown below.

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Failure Check
Cautions for
Removal
Transportation
and Cautions
for Assembly
Cautions for
Installation
Cautions for
Grounding
If there is a problem with operation, check the followings first.
■Remove the cover and check the output contact of snap switch. (Check the output by connecting
COM with N.O or N.C using a tester.) Replace the snap switch if necessary.
■After checking the snap switch, remove the product and move up or down the displacer and recheck
the contact with the tester. When moving up of down the displacer, check the internal core (magnet)
and the fixed magnet on the switch block.
■ Recheck if the measuring point of fabricated product and level of measure object are leveled.
■When moving up or down the displacer, check if the extension spring is correct displaced.
(HM-90-Ex Series)
■ Recheck if the float is positioned on top of the object to be measured.
(HM-95-Ex Series)
■ Pay special attention to prevent any impact on the product during transport or assembly.
The impact may directly lead to a failure.
■ When attaching the product to a vessel, pay attention to prevent any damage to the assembly
packings.
■ Check the level and presence of object to be measured in the vessel before removing it.
■ The product may be overheated so wear gloves to prevent burns.
■ If there is explosive gas in the atmosphere, do not open the cover.
■ Make sure that any O-ring or gasket is not damaged while opening or closing the cover.
■ To remove the cover of an ex-proof product, release the lock key first.
■ Use the same standard flange or screws.
■ 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 of the
container.)
■ Install an ex-proof product in an ex-proof zone.
Make sure that the product would not be subject to any high impact during transport or
assembly.
External ground is located on top of the cable entry, and the grounding wire to connect
external ground must be 4 mm2(4 mm SQ). (Internal ground is connected before shipment.)
Make sure to insert a washer if the terminal lug is removed from the ground
terminal and then reconnected (to prevent loosening).

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Cautions for
Inserted External
Wire
Safety and
Environment
Marking
■ Cautions for Use
- Make sure to connect the product and container using the required tools.
- Store the key safely and make sure that it is locked.
- Do not apply high impact to the product.
■ Cautions for Wiring
- Make sure to correctly connect the contacts.
- Pay attention to prevent electric shocks.
■ Disposal
- Make sure to separate the microswitch of a switch block from the
housing before wasting the product.
No part affects the environment so no special attention is required
(e.g., mercury switch).
■ Use the cable gland connection or metal pipe line lead-in on the wire inlet,
and use a product with an equivalent ex-proof certificate to connect it using the
external line lead-in method.
■ For an unused external line inlet, use a closing plug with an equivalent ex-proof
certificate.
■The label is attached on the housing to state the model, serial number, working
temperature, working pressure, and output. The serial number is a unique
manufacturing number.
Ex-Proof Version

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Product Notation
■IECEx and Atex Certification standard
IEC 60079-0 : 2017 Edition : 7.0
Explosive atmospheres –Part 0 : Equipment –General requirements.
IEC 60079-1 : 2014 Edition : 7.0
Explosive atmospheres –Part 1 : Equipment protection by flameproof enclosures “d”IEC
EN 60079-0 : 2018
Explosive atmospheres –Part 0 : Equipment –General requirements. (IEC 60079-0:2017)
EN 60079-1 : 2014
Explosive atmospheres –Part 1 : Equipment protection by flameproof enclosures “d”
The composition of the product is as follows.
HM-9 ** * - Ex- *
(Only HM-90-Ex)
1F (1-POINT)
2F (2-POINT)
3F (3-POINT)
4F (4-POINT)
“H”High Temperature
“V”(Only HM-95V_Side Type))
“0” Displacer Type Level Switch
“5” Ball Float Type Level Switch

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User Training
Warranty
and Contact
■Warranty and Service
This product is subject to a two-year warranty upon shipment and free service will
be provided for any damage found under normal operating conditions. If troubles
that occur are not due to product failure, service charge will apply.
You can request A/S from our website or by contacting our headquarters.
■Headquarters, Factory, and Research Center (Contacts)
Address: HITROL CO., LTD. 141, Palhakgol-gil, Jori-eup, Paju-si, Gyeonggi-do,
Republic of Korea (Palhakgol-gil 98)
TEL.: [phone] (Headquarters and A/S)
FAX: [phone]~9799 (Headquarters and A/S)
Do not apply a non-ex-proof product in an ex-proof zone.
An ex-proof product can be used where the environment and containers of the
object to be measured are type 1 and 2.
Read and understand the aforementioned and make sure that the temperature of
the object to be measured does not exceed 120℃ for general purpose. For an ex-
proof type, the maximum is 435℃. In addition, make sure that the ambient
temperature of the housing is kept at -20 ~ +60℃.
Ensure that a high-temperature cable is used for high-temperature products
(to prevent cable damage).
An ex-proof product is a pressure-resistance and ex-proof type, so do not open
the cover while using it.