HollySys HT5 Series User manual

Please read the manual before using the product
HT5 series metal tube flowmeter
Instructions for use

CONTENTS
1、Instructions.....................................................................................................................1
1.1 Intended use .........................................................................................................................1
1.2 Safety instructions ..........................................................................................................1
1.3 Copyright and data protection ...........................................................................................1
1.4 Technical Support. .............................................................................................................1
2、Device description.........................................................................................................2
2.1 Brief description .................... ... .......................................................................................2
2.2 Structure principle .............................................................................................................2
2.3 Features .......... ... ...............................................................................................................3
2.4 Capabilities .......................................................................................................................3
2.5 Technical Parameters . .........................................................................................................4
2.6 Model Description ...............................................................................................................7
2.7 Flow Meter ...........................................................................................................................8
2.8 Indicator Type. ....................................................................................................................9
2.9 Indicators Structure and disassembly ...................................................................................11
2.10 Float damping ......................................................................................................................11
2.11 Installation conditions .....................................................................................................12
3、Electrical connections..................................................................................................13
3.1 Safety instructions ..............................................................................................................13
3.2 Conversion module connection ..................................................................................................13
3.3 Limit switch connection.. ......................................................................................................14
4、Dimensions...........................................................................................................................15
4.1 Basic and Heat insulation Dimensions HT50 . .........................................................................15
4.2 Dimensions HT50/RP......................................... ........ .......... ........ ....................................16
4.3 Dimensions HT51.......................................................................... …..................................16
4.4 Dimensions HT52.................................... ............................................................................16
4.5 Dimensions HT53................................................ ....... ........... ............................................17
4.6 Dimensions HT54........................................................... ...... ..............................................18
4.7 Dimensions HT55...................................................... ...... ...................................................18
4.8 Dimensions HT56............................... ........................ ........................................................19
5、 Installation ..............................................................................................................................20
5.1 Installation conditions ........................................................................................................20
5.2 Protection category .............................................................................................................21
5.3 Installation diagram ............................................................................................................21
6、Maintenance .......................................................................................................................23
6.1 Indicator . ..........................................................................................................................23
6.2 Measuring tube .....................................................................................................................24
7、Caliber ..............................................................................................................................26
7.1 Determine the correction coefficient Kx ..................................................................................26
7.2 Determine float diameter and measurement range .......................................................................27
Appendix Selection Specification.....................................................................................28

1
Metal tube flowmeter
1. Terms and Conditions
1.1 Intended use
Metal tube flowmeter in mind, also known as variable area flowmeter (hereinafter referred
to as meter).The variable area flowmeter are suitable for measuring gases, vapours and
liquids.Meter can be used to measure the continuous cleaning of gases and liquids, especially
for flow measurement and control of low flow, low flow rate, harsh media conditions. Not
used to measure solid particles and highly viscous media. If the media conditions are quite
poor, when ordering the instrument, please contact me to confirm the instrument meets its
requirements. The devices are particularly suitable for the measurement of:Water、
Hydrocarbons、Corrosion protection agents and lubricants、Chemicals and additives、Solvents、
Superheated steam、Air、Industrial gases and so on.
Meter is limited to medium conditions specified under meter data (temperature, pressure,
media and the environment etc.).
WARNING!
The operator himself bears the sole responsibility for the intended use of the device
regardingthe suitability and the corrosion resistance of the used materials against the
measured fluid.The manufacturer is not liable for any damage resulting from improper use
or use for other thanthe intended purpose.
1.2 Safety instructions
Using this product, please read the instructions carefully to avoid improper use, causing
injuries to the user, damage equipment, cause
Accidents. Meter used in hazardous areas, must carefully review whether the nameplate before
commissioning explosion-proof requirements, proof mark, should be properly installed in
accordance with the requirements of explosion protection, Using instruments, to avoid
security risks, ensure safety in production.

2
1.3 Copyright
This article belongs to all companies, the company has to explain, change, improve, improve
rights. Subject to change without
Notice.
1.4 Technical Support
When users select a product, please read this manual carefully and combine your conditions
select the appropriate function of the instrument.If you have technical problems in the
selection process or read or explained in the manual is not clear where you need help, please
contact our technical department, you will be satisfied with the technical support and
ultimately help you solve all the questions.
2. Product description
2.1 Description
HT5series metal tube is based on a variable area flow meter float position measurement.
All-metal structure, modular design, because of its small size, small pressure loss, range
ratio (10: 1), easy installation and maintenance, etc., it is widely used in various
industries complex, harsh environment, low flow, low flow rates, a variety of harsh
conditions of media flow measurement and process control.
HT5series metal tube using the international advanced non-contact magnetic sensor,
and with a single-chip microprocessor system, enabling the liquid crystal display,
cumulative, remote output (4 ~ 20mA), upper and lower alarm output function the instrument
has high accuracy and reliability, and can replace imported the same type of Meter, and
has a cost-effective, multi-parameter calibration, power-down protection and so on.
HT5series metal tube series of products for different user needs, different
occasions, for a variety of measurements in the form of user-selectable; divided by output
in the form of local indication type, output type remote control alarm type; according to
the requirements of explosion-proof classification, can be divided into ordinary type,
intrinsically safe, explosion-proof isolation-type three; site process flow according to

HT5 series metal tube flowmeter
3
user requirements, vertical mount (HT50), progress under-mount (HT51), side into the side
mount (HT52), end into the side-mounted (HT53), threaded connection type (HT54),
horizontal-mounted installation (HT56R / L) and other options.
2.2 Structure principle
HT5series metal tube composed of two parts:
Measuring tube - magnetic couplings, sensors;
Indicators - signal conversion, conditioning, or a
digital display indicating the scale;
Wetted material of the measuring tube there are four:
stainless steel, Hastelloy, titanium, stainless steel
lining PTFE; the user may require different process
pressure corrosive media and select different wetted material to meet process pressure
corrosion and media needs. Depending on the measurement requirements, users in the selection,
you can select a different combination of indicators, to achieve different measurement
requirements. Specific type indicator corresponding function indicator see chapter.
Measuring principle
Relative to a medium flows
through the sensor fixing
condition, when the flow
rate reaches a certain
flow design flow range,
the float rises to a position of the cone relative to a stationary, then flow area changes,
the float suffered three a force equilibrium (gravity + = thrust buoyancy), this position
by the close magnetic coupling transmission shaft driven pointer and components, completion
pointer flow indication, through the modular design of the converter is converted to the
flow rate corresponding to 4 ~ 20mA / Hart output. Change the position of the float, that
reflects the changing media traffic.

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2.3 Features
 Simple and practical, low-cost installation, in situ measurements without
auxiliary power;
 General concept of prevent explosion: explosion-proof and intrinsically safe
isolation integration;
 Modular design, easy maintenance, maintenance-free normal use;
 A variety of flow: horizontal, down-up, up- down, side to side, a bottom side
optional;
 All-metal structure, seismic, pressure, temperature, corrosion resistance;
 Variety of connections: flanged, threaded, fast card and other equipment;
 Range ratio: 10: 1 special can be 20: 1;
 Variety of power supply (220V AC, 24V DC, battery-powered);
 Material specifications: 304, 316, 316L, Hastelloy, PTFE lined, etc;
 Standard output (current 4 ~ 20mA, available with HART communication);
2.4 product function
LCD: You can customize the display of instantaneous value, the accumulated value,
current output value, percent of range;
Output signal: 4 ~ 20mA two-wire output;
HART Communication: Supports universal HART protocol;
Configuration features: engineering units, state media, medium density, operating
pressure, operating temperature, the density of the float,
measuring range, display variables, alarm and other protection
configuration; and having cleared the cumulative flow, zero
correction;
Protection function: to set upper and lower limit guard values; below the lower limit
or above the upper limit output 3.8mA or 22mA.
Monitoring functions: on-line monitoring of instantaneous value, the percentage of the
output current, the accumulated value of the like;

HT5 series metal tube flowmeter
5
Calibration function: analog output current calibration;
Calibration function: You can choose from 5 to 16 points calibration;
Host variable zero: zero trim function;
Power-down protection: In case of power failure without loss of data;
LCD backlight: LCD with backlight can be better at night or in dark light observation
instruments;
The cumulative amount of storage: storage and memory cycles accumulated value can be
changed;
Situ configuration functions: engineering units, state media, medium density,
operating pressure, operating temperature, the density of the float,
measuring range, display variables, alarm and other protection
configuration and having accumulated traffic cleared, zero
correction, data recovery Features;
Current output trim: capable of 4mA and 20mA current trimming;
Data backup and recovery: the manufacturer of the instrument configuration, after
calibration, the original factory backup information, such as on-site personnel
due to non-normal adjustment resulting instrument does not work, you can enter the
password "5942", enter the data operations restore function, select the factory
information transferred to the manufacturer, and cover the illegal user error
message, normal operating state.
Parameter setting can be achieved: multi-parameter calibration, automatic ambient
temperature compensation function;
User Fixed: users can amend their own 5-point field (field regulation meter curve);
2.5 Technical Parameters

6
Product
Model
Technical
Parameters
HT50
HT51 HT52 HT53
Meter diameter
DN15~DN150
Measuring range
water （20°） 16~150000L/h；
air （20°0.1013MPa ）0.5~5000m3/h
Range ratio
Standard ：10:1；Particular ：20:1
Accuracy
1.0；1.5
Mounting height
Standard :250mm( Particular, please consult the manufacturer )
Wetted materials
R0(316)R1(304)RL(316L)RP(PTFE lining )
RC( Hastelloy C）RT（Ti titanium liner ）
R0(316); R1(304) ; RL(316L) ;
Pressure Level
Standard ：DN15~DN50 4.0MPa；
DN80~DN200 1.6MPa；
Particular：DN15~DN50 5~42MPa；
DN80~DN150 2.5~16MPa；
Jacketed pressure rating ：1.6MPa ；
Standard ：
DN15~DN50 4.0MPa；
DN80~DN200 1.6MPa；
Particular ：
DN15~DN50 5~42MPa；
DN80~DN100 2.5~25MPa；
DN150 2. 5~16MPa
Connection
Standard flanges ：HG/T20592-2009；Or specified by the user of any standard flanges
Ambient temperature
-40℃~120℃， Flameproof ：-20℃~+40℃， Intrinsically Safe ：-20℃~+40℃
Medium temperature
Standard -40℃～+120℃； Particular -80℃～+350℃； PTFE lining ≤80℃
Signal output
Two-wire4 ~ 20mA output;Hart communication;Two-wire sensor threshold
switch ,8VDC power supply;
Power supply
Standard :24VDC(10.8VDC～28VDC) AC type :220VAC(85～265VAC)
Battery type :3.6V-9Ah lithium battery
Explosion levels
Intrinsically Safe ：Exia II CT6 Ga Flameproof ：Exd II CT6 Gb
Protection class
IP65
Medium viscosity
DN15：≤5mpa.s（H15.1~15.3)
≤30mpa.s（H15.4~15.9)
DN25：≤250mpa.s
DN50~DN150：≤300mpa.s
Display method
Scene pointer display; LCD
Electrical connections
1/2”NPT；M20×1.5；

HT5 series metal tube flowmeter
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Product
Model
Technical
Parameters
HT54
HT55
Meter diameter
DN15~DN100
DN15~DN100
Measuring range
water（20°）16~100000L/h
air（20°0.1013MPa）
0.5~3000m3/h
water（20°）16~100000L/h
air（20°0.1013MPa）
0.5~3000m3/h
Range ratio
Standard ：10:1；Particular ：20:1
Accuracy
1.0；1.5
Mounting height
Standard :250mm( Particular, please consult the manufacturer )
Wetted materials
R0:316;R1:304;RL:316L;
R0(316); R1(304) ; RL(316L) ;
Pressure Level
Standard ：DN15~DN50 4.0MPa
Particular, please consult the
manufacturer
Standard ：DN15~DN100 1.6MPa
Particular, please consult the
manufacturer
Connection
Pipe thread ；Threaded SMS
Jacket (quick connector)
Ambient temperature
-40℃~120℃， Flameproof ：-20℃~+40℃，Intrinsically Safe ：-20℃~+40℃
Medium temperature
Standard -40℃～+120℃； Particular -80℃～+350℃
Signal output
Two-wire4 ~ 20mA output;Hart communication;Two-wire sensor threshold
switch ,8VDC power supply;
Power supply
Standard :24VDC(10.8VDC～28VDC) AC type :220VAC(85～265VAC)
Battery type :3.6V-9Ah lithium battery
Explosion levels
Intrinsically Safe ：Exia II CT6 Ga Flameproof ：Exd II CT6 Gb
Protection class
IP65
Medium viscosity
DN15：≤5mpa.s（H15.1~15.3)
≤30mpa.s（H15.4~15.9)
DN25：≤250mpa.s
DN50~DN100：≤300mpa.s
Display method
Scene pointer display; LCD
Electricalconnections
1/2”NPT；M20×1.5；

8
Product
Model
Technical
Parameters
HT56
Meter diameter
DN15~DN50
DN80~DN150
Measuring range
water（20°）16~25000L/h
air（20°0.1013MPa）
0.5~1000m3/h
water（20°）16~150000L/h
air（20°0.1013MPa）
1000~4000m3/h
Range ratio
Standard ：10:1；Particular ：20:1
Accuracy
1.0；1.5
Mounting height
250mm
250mm or 350-400mm
Wetted materials
R0:316;R1:304;RL:316L;
R0(316); R1(304) ; RL(316L) ;
Pressure Level
Standard ：DN15~DN50 4.0MPa
Particular ：DN15~DN50 6.3MPa
Standard ：DN80~DN150 1.6MPa
Particular ：DN80~DN50 6.3MPa
Connection
Standard flanges ：HG/T20592-2009；Or specified by the user of any standard
flanges
Ambient temperature
-40℃~120℃， Flameproof ：-20℃~+40℃，Intrinsically Safe ：-20℃~+40℃
Medium temperature
Standard -40℃～+120℃； Particular -80℃～+350℃
Signal output
Two-wire4 ~ 20mA output;Hart communication;Two-wire sensor threshold
switch ,8VDC power supply;
Power supply
Standard :24VDC(10.8VDC～28VDC) AC type :220VAC(85～265VAC)
Battery type :3.6V-9Ah lithium battery
Explosion levels
Intrinsically Safe ：Exia II CT6 Ga Flameproof ：Exd II CT6 Gb
Protection class
IP65
Medium viscosity
DN15：≤5mpa.s（H15.1~15.3)
≤30mpa.s（H15.4~15.9)
DN25：≤250mpa.s
DN50~DN150：≤300mpa.s
Display method
Scene pointer display; LCD
Electrical
connections
1/2”NPT；M20×1.5；

HT5 series metal tube flowmeter
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2.6 Model Description
2.7 流量表
浮子材质： 1□R0、R1、RC 2□PTFE、RT
口径 浮子号 水空气 HT50 标准型
(20℃) 0.1013MPa(abs) 20℃最大压力损失
DN l/h m3/h KPa
1□2□1□水空气
15 H15.1 16 - 0.5 2.0 7.0
H15.2 25 16 0.7 2.3 7.2
H15.3 40 25 1.1 2.5 7.3
H15.4 63 40 1.8 2.5 7.5
H15.5 100 63 2.8 2.5 7.8
H15.6 160 100 4.8 2.6 8.0
H15.7 250 160 7.0 2.7 10.0
H15.8 400 250 10.0 2.9 10.8
H15.9 630 400 16.0 3.4 14
25 H25.1 630 400 16 4.0 7.0
H25.2 1000 630 30 4.1 8.0
H25.3 1600 1000 45 4.4 12.0
H25.4 2500 1600 70 5.2 19.0
H25.5 4000 2500 110 7.0 25.0
2.7 Flow rate table
HT5 □\□\ □\□\□\□
Proof
EX Intrinsically safe
Ed Explosion Isolation
In
di
c
at
o
r
M
4
1 Local Indication (pointer)
2 24VDC, pointer, 4-20 output
3 220VAC, pointer and LCD, 4-20MA output
4 24VDC，pointer and LCD, 4-20MA output
5 Battery-powered,pointers,and LCD,
K1 SJ3.5N Two limit switches
K2 SJ3.5N Two limit switches
A
d
di
ti
o
n
al
M
ul
ti
pl
e
ch
oi
ce
WSanitary （OnlyHT50)
Z With damping（Gas inlet pressure measurement or
unstable）
T Jacket type （Heat or cooling required）
G High temperature （≥120℃）
Y High pressure （Greater than standard pressure）
H Hart communication （With remote output）
Tube
Caliber
DN15-DN150 （HT50 .HT51 .HT52 .HT53. HT56）
DN15-DN100 （HT54 .HT55）
Wetted
materials
R0(316) R1(304) RL(316L) RP(PTFE lining) RC(Hastelloy C）RT（Ti Titanium liner）
Installa
tion
form
0 Vertical installation down-up
1 Vertical installation up-down
2 Side - side mounting side-side Description left or right when ordering
3 down-side mounting down-horizontal Description left or right when ordering
4 Threaded down-up
5 Jacket Installation down-up
6R Horizontal mounting right-left
6L Horizontal mounting left-right

10
Float Material：1□R0、R1、RC 2□PTFE、RT
Caliber Float size Water Air Standard HT50
(20℃) 0.1013MPa(abs) 20℃The maximum pressure loss
DN l/h m3/h KPa
1□2□1□水空气
15 H15.1 16 - 0.5 2.0 7.0
H15.2 25 16 0.7 2.3 7.2
H15.3 40 25 1.1 2.5 7.3
H15.4 63 40 1.8 2.5 7.5
H15.5 100 63 2.8 2.5 7.8
H15.6 160 100 4.8 2.6 8.0
H15.7 250 160 7.0 2.7 10.0
H15.8 400 250 10.0 2.9 10.8
H15.9 630 400 16.0 3.4 14
25 H25.1 630 400 16 4.0 7.0
H25.2 1000 630 30 4.1 8.0
H25.3 1600 1000 45 4.4 12.0
H25.4 2500 1600 70 5.2 19.0
H25.5 4000 2500 110 7.0 25.0
H25.6 6300 4000 180 12.5 33.0
50 H55.1 6300 4000 180 4.7 8.0
H55.2 10000 6300 250 5.1 15.0
H55.3 16000 10000 400 6.2 22.0
H55.4 25000 16000 1000 8.0 35.0
80 H85.1 25000 16000 1000 5.3 15.0
H85.2 63000 25000 1200 7.8 22.0
100 H105.1 63000 40000 1800 11.4 35.0
H105.2 100000 63000 3000 16.7
150 H155.1 150000 100000 4000 17.0
2.8 Indicator

HT5 series metal tube flowmeter
11
M4 indicator may install different modules for different functions.
Indicator with LCD display variables can be set, see the specific commissioning
instructions.
2.8.1 M41 Indicator（Basic type）
①------- pointer
②------- Axis system assembly
③------- Rail bracket fastening screws
④------- Rail bracket
⑤------- The nameplate
The main function:
With the sensor can be achieved with live pointer, no
external power supply.
2.8.2 M42 Indicator
①------- pointer
②------- Signal transmission module
③------- Terminals
④------- Rail bracket
⑤------- Operation buttons
⑥------- The nameplate
⑦------- Outlet connector
The main function:
With the sensor can be achieved with live pointer, 24VDC power
supply, two-wire 4-20mAoutput.
2.8.3 M43 Indicator
①------- pointer
②------- LCD
③------- LCD mounting plate
④------- Conversion module and a power outlet
⑤-------3.6V DC battery
⑥------- Rail bracket
⑦------- Operation buttons
⑧------- The nameplate
The main function:
With the sensor with, 3.6V DC power supply, enabling
LCD and pointer, no output.
2.8.4 M44 Indicator
①------- pointer
②------- LCD
③------- LCD mounting plate

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④------- Conversion module and 24V DC power outlet
⑤------- Rail bracket
⑥------- Operation buttons
⑦------- The nameplate
⑧------- External ground screw
⑨------- Outlet connector
The main function: With the sensor with, 24VDC power supply, enabling LCD and
pointer, two-wire 4-20mAoutput (selectable Hart communication).
2.8.5 M45 Indicator
①------- pointer
②------- LCD
③-------220V AC outlet
④------- Rail bracket
⑤-------4-20mA output socket
⑥------- Operation buttons
⑦------- The nameplate
⑧------- Outlet connector
The main function: With the sensor with, 220VAC power
supply, enabling LCD and pointer, 4-20mA output (selectable Hart
communication).
2.8.6 MK1/MK2 Indicator
①------- Initiator
②------- Alarm pointer
③------- Terminals
④------- Rail bracket
⑤------- Limit switch board
⑥------- The nameplate
⑦------- Outlet connector
The main function:
With sensor fit, install one or two limit switches with an external
transistor amplifier with the realization of 1:00 or 2:00 alarm. Pointer can be achieved.
See in particular described later.
2.9 Indicators Structure and disassembly

HT5 series metal tube flowmeter
13
 Indicator Construction: housing cover, instrument panel, conversion module, plug
the module frame rails, pointers, Axis system assembly, chassis and other components.
 Loosen housing cover locking screws, unscrew the housing cover (when installed
housing cover must be tightened to prevent the corrosive gas and water vapor into the
device casing corrosion).
 Instrument panel: mounted in the front of the recess (not with other grooves),
careful attention when removing and installing bending deformation can not dial.
Instrument panel: mounted in the front of the recess (not with other grooves),
careful attention when removing and installing bending deformation can not dia
 Switch board: installed in the third layer recess and pointers fan-shaped plate
with the completion of the alarm function. Plug and play.
 Conversion Module: Installation in the fourth floor recess, after unplug the power
cord with a Phillips screwdriver to remove the converter module on the left column
positioning screw imprisonment, then remove the can.
 The shaft assembly: Remove the three fixing screws on the frame rails and remove
the rails frame and axle assembly.
Remove the screw connection indicator With the sensor (measuring tube) between
the sensor and the indicator can be separated.
2.10 Damper device
Objective metal tube Damping device is slow or even overcome instrumented unstable due
process reasons which led pointer swing sharply, output fluctuations larger, not normal
use and other conditions.
The following situations should be installed Damper device:
Low operating pressure
Pressure mounting position is unstable.
Meter pipe diameter before and after the change is too large.
Before and after the straight pipe seriously do not meet the specified requirements.
Measuring medium is a gas.

14
Will result in these cases in the media flow meter measuring tube is very unstable,
float suffered three forces can not achieve equilibrium caused
by the float up and down, up and down movement of the float
is transmitted by a magnetic coupling system, so do follow the
motion of the pointer Axis system, ultimate expression of
continuous non-stop swing pointer larger output variation
margin. Users can not read the current instantaneous value
scale, transmitter output signal can not be used by the system.
Customers are advised to avoid the above situation, please
select the instrument with additional structural damping
device. Even so, they can not guarantee the stable operation
of the instrument, situations pointer swinging and output volatility does not appear, it
is suggested that users should namely process design, instrumentation installation location,
piping configuration, the voltage boost efforts to fundamentally solve the instrument could
cause unstable situation occurs.
Note: In order to achieve stable operation of the instrument working conditions, in
the selection of design should meet the working pressure stable and not less than 2 times
the pressure loss meter, gaseous medium working pressure should not be less than 5
times the pressure loss of the instrument.
2.11 Mounting accessories - magnetic filter and the straight pipe
Mounting accessories metal tube: the magnetic filter and the straight pipe, a user can
optionally order. The fluid conduit or contain tiny ferromagnetic particles dross purge
is not clean, it should be installed in the instrument magnetic filter to prevent adsorption
of the float when ferromagnetic particles flow through the float, causing float Caton, and
can not return movement not comfortable. Magnetic filter should be cleaned regularly to
prevent smoke filled not achieve filtration.
Location of the installation of the meter shall ensure that there is greater than or
equal inlet straight pipe 5D and export not less than 250mm straight pipe segment, the user
can request the installation location, choose to order straight pipe, to meet the conditions

HT5 series metal tube flowmeter
15
of stable operation of the instrument.
Dimensions are shown.
Straight pipe straight pipe PTFE lining filter PTFE lining filter
Caliber DN15 DN25 DN50 DN80 DN100 DN150
Former straight pipeH1≥（mm）75 125 250 400 500 750
After the straight pipeH2≥（mm）250 250 250 250 250 250
d（mm）95 115 165 200 220 285
Note: The straight pipe and magnetic filters are used HG / T20592-2009 standard flanges,
special criteria specified by the user.
3 Electrical connections
3.1 Precautions
 Electrical connections shall be
carried out in order to disconnect the
power supply situations. Instruments
for hazardous areas explosion-proof
document should refer to comply with
safety regulations, by qualified personnel to electrical operation. Please see the
installation wiring The nameplate, conforming instruments and acknowledgment of
receipt of the order, confirm the parameters of voltage on the nameplate.
 Recommended cable diameter 8-13mm; at the entrance to the cable interface cable

16
is bent into a U-shaped to provide a drip point; cable connection fittings to avoid
the use of ferromagnetic materials products, the ferromagnetic material will affect
the measurement;
to the terminal, and then the outlet connector locking nut tightened before tightening
indicator cover to ensure that housing is airtight.
 Proof products Note: When used in hazardous locations, please first check whether
the meter pointer mark the approval label, if the intrinsically safe explosion-proof
EXiaII CT6Ga, should be based on the maximum allowable connection cable distributed
capacitance, inductance parameter selection cable, by placing in a safe place barrier
for the power meter. If it is flameproof EXdIICT6Gb should be noted that cables are
lead directly to a safe place, no points midway core wire, cable and wiring should be
connected to the lead terminals solid and reliable, without fly line phenomenon.
3.2 Conversion module wiring
Only for M42, M44, M45 type indicator. For 220V AC power supply M45 type indicator, power
lines and signal lines, respectively, the joint should enter from a different outlet.
Connection diagram is as follows:
3.3 Limit switches and wiring

HT5 series metal tube flowmeter
17
M4 type indicator can install up to two limit switches constitute M4K1 and M4K2 type
indicator. Limit switch is a fork sensor, activated by the metal blade by induction
semicircular pointer on. The switching point by the limit pointer to set the dial at the
switch position display on the dial. Limit alarm switch mounted in the indicator part is
called TG22. TG22 limit alarm switch consists SJ3,5 type initiator, aluminum, etc., by
changing the position of the pointer can be arbitrarily set limit alarm value.
TG22 limit alarm switch with an external transistor relays used in conjunction with
the implementation, lower limit alarm output signal, the transistor relay WE77 / EX-1 and
WE77 / EX-2 includes a power pack, rectifier transistor amplifier and relay output. WE77
/ EX-1 with a set of safety control circuit can be equipped with a limit switch, WE77 /
EX-2 with two safety control circuit can be equipped with two limit switches. Relay normally
open contact work, it is easy to transform jumpers according to the table to change the
way work is normally closed, or normally closed to work with open-circuit fault LED monitor
mode
①Offline alarm pointer
②On-line alarm pointer
③Fastening screws
④Limit switch
⑤Connection terminals
Two-wire switch board: