Trong mỗi đồng hồ đo lưu lượng Thermal mass có hai đầu dò nhiệt độ được cắm sâu vào trong đường ống, thường là các đầu dò nhiệt điện trở PT100. Một trong 2 đầu dò được sử dụng để đo nhiệt độ thực tế trong lòng ống mà không quan tâm đến lưu tốc của khí cần đo, đầu dò còn lại được nung nóng liên tục bằng điện năng nhằm duy trì 1 nhiệt độ không đổi so với đầu kia.
Khi chưa có lưu lượng chảy qua, độ chênh lẹch nhiệt độ giữa 2 đầu dò là không đổi. Khi có lưu lượng, phần nhiệt năng của đầu dò được gia nhiệt sẽ bị cuốn theo dòng chảy dẫn đến giảm nhiệt độ trên que đo. Hiệu ứng làm mát này sẽ được đo, và bù ngay lập tức bằng cách tăng dòng điện gia nhiệt.
Kết quả là độ chênh lệch nhiệt độ giữa 2 đầu dò luôn luôn không đổi , dòng điện gia nhiệt tỉ lệ thuận với hiệu ứng làm mát nên cho mát đo được trực tiếp lưu lượng khối lượng chảy trong lòng ống. Khi lưu tốc càng lớn thì hiệu ứng làm mát càng tăng dẫn đến dòng điện gia nhiệt càng lớn.
Đồng hồ Thermal mass có thể cắm thẳng trực tiếp vào đường ống qua các chuẩn kết nối cụ thể , phù hợp để lắp vào các đường ống vuông hoặc hình chữ nhật.
Phù hợp sử dụng để đo các loại khí như : N2, O2, NO2,Ag...
Đường kính ống : DN8 - DN300
Phạm vi hoạt động : 0.1 up to 224 m/s
Ít phụ thuộc vào áp suất đường ống

Một số hình ảnh về Thiết bị đo lưu lượng khí Cs Instruments kiểu Thermal mass

Đồng hồ đo lưu lượng dạng Thermal Mass có 2 loại lắp là insertion ( lắp qua van bi) và inline ( lắp trực tiếp)

1. Bảng đo lưu lượng khí dạng Thermal mass

Flow Ranges - Insertion Meters
Pipe Diameter	SCFM	MSCFD	NM3/H
1.5" (40mm)	0 - 354	0 - 510	0 - 558
2" (50mm)	0 - 583	0 - 840	0 - 920
2.5” (63mm)	0 - 830	0 - 1,310	0 - 1,200
3" (80mm)	0 - 1,280	0 - 1,840	0 - 2,020
4” (100mm)	0 - 2,210	0 - 3,180	0 - 3,480
6" (150mm)	0 - 5,010	0 - 7,210	0 - 7,910
8" (200mm)	0 - 8,680	0 - 12,500	0 - 13,700
10" (250mm)	0 - 13,600	0 - 19,600	0 - 21,450
12" (300mm)	0 - 19,400	0 - 27,900	0 - 30,600

Flow Ranges - Inline Meters
Pipe Diameter	SCFM	MSCFD	NM3/H
0.75”	0 - 93	0 - 134	0 - 146
1”	0 - 150	0 - 216	0 - 237
1.25”	0 - 260	0 - 374	0 - 410
1.5"	0 - 354	0 - 510	0 - 558
2"	0 - 583	0 - 840	0 - 920
2.5”	0 - 830	0 - 1,310	0 - 1,200
3"	0 - 1,280	0 - 1,840	0 - 2,020
4”	0 - 2,210	0 - 3,180	0 - 3,480
6"	0 - 2,500	0 - 3,600	0 - 3,950

* Lưu ý : Việc chọn đường kính ống và kiểu lắp rất quan trọng, hãy liên hệ với chúng tôi để được tư vấn và hỗ trợ tốt nhất*

Một số Model Flow meter CS Instruments thường dùng tại Việt Nam

2. Đồng hồ đo lưu lượng khí CS Instruments

VA500 CS Instruments

RS 485 interface, Modbus-RTU as a standard
Option integrated display for m³/h and m³
Usable from 1/2“ to 12“ (DN 300)
Easy installation under pressure
4...20 mA analogue output for m³/h resp. m³/min
Pulse output for m³
Inner diameter adjustable via keypad
Consumption counter resettable
Adjustable values at the display of the flow sensor: Reference conditions, °C and mbar, 4...20 mA scaling, pulse weight

Flow sensor VA 500			Order no.
VA 500 flow sensor, with RS 485 interface (Modbus-RTU), with analogue output 4...20mA and pulse output (galvanically separated)			0695 5001
Max. Version (185 m/s)			Z695 5003
HighSpeed version (224 m/s)			Z695 5002
Display			Z695 5000
M-Bus (pulse output not available)			Z695 5004
Sensor length 120 mm			ZSL 0120
Sensor length 160 mm			ZSL 0160
Sensor length 220 mm			ZSL 0220
Sensor length 300 mm			ZSL 0300
Sensor length 400 mm			ZSL 0400
Sensor length 500 mm			ZSL 0500
Sensor length 600 mm			ZSL 0600
Sensor length 700 mm			ZSL 0700
Ball valve I/I G 1/2" stainless steel			3300 0002
welding neck, L = 35 mm, male screw, R1/2",stainless steel 1.4301			3300 0006
welding neck, L= 35 mm, male screw, R1/2",stainless steel 1.44571			3300 0007
M12 – T plug for VA 500/520 to connect several sensors			020000823
Real gas calibration for oxygen (O2) with cleaning - free of oil and grease			3200 0010
Oil and fat free, special cleaning			0699 4005
5 point precision calibration of new instrument with ISO certificate			3200 0001
Real gas calibration			3200 0015

Chuyên dùng đo khí, khí nén trong công nghiệp

3. Đồng hồ đo lưu lượng khí nén CS Instruments

VA520 CS Instrument

Our affordable mass flow meter for compressed air and gases works according to the approved calorimetric measuring principle. An additonal pressure and temperature compenstation is not necessary. Contrary to the previously used bridge circuit the newly developed evaluation electronics records all measured values digitally. This enables very precise and fast measurements

Flow meter VA520			Order no.
VA520 Flow meter with integrated 1/4", DN 8 measuring section 1,4301			0695 0520
VA520 Flow meter with integrated 1/2", DN 15 measuring section 1,4301			0695 0521
VA520 Flow meter with integrated 3/4", DN 20 measuring section 1,4301			0695 0522
VA520 Flow meter with integrated 1", DN 25 measuring section 1,4301			0695 0523
VA520 Flow meter with integrated 1 1/4", DN 32 measuring section 1,4301			0695 0526
VA520 Flow meter with integrated 1 1/2", DN 40 measuring section 1,4301			0695 0524
VA520 Flow meter with integrated 2", DN 50 measuring section 1,4301			0695 0525

4. Đồng hồ đo lưu lượng khí gas CS Instruments

VA550 CS Instruments

4 values in the display: Nm³/h, Nm³, Nm/s, °C units freely adjustable
Min/max values and daily/hours/minutes average values freely adjustable
All measured values, settings like gas type, inner diameter, serial number and so on retrievable via Modbus RTU
Comprehensive diagnosis functions readable at the display or remote access via Modbus like e. g. exceeding of max/min values °C, calibration cycle, error codes, serial number, all parameters readable and adjustable
Notification in case of exceeding of the calibration cycle
Standard version accuracy 1.5 % of m.v. ± 0.3 % of f.s.
Precision version accuracy 1.0 % of m.v. ± 0.3 % of f.s. up to
40 calibration points with certificate
Measuring span of 1 : 1000 (0.1 up to 224 m/s)
Configuration and diagnosis via display, hand-held instrument
PI 500, PC service software on-site
Gas type (air, nitrogen, oxygen, argon and so on) freely adjustable
Reference conditions °C and mbar/hPa freely adjustable
Zero-point adjustment, leak flow volume suppression
Pressure loss negligible
Flow measurement in both directions via flow direction switch

The immersion flow meter VA 550 is the ideal flow sensor for installation into existing compressed air resp. gas lines from 3/4“ up to DN 500.

Robust impact-proof aluminum die cast housing for the outdoor area IP 67
All medium-touching parts made from stainless steel 1,4571
As immersion sensor suitable for 3/4“ up to DN 500
On request with ATEX approval ATEX II 2G Ex d IIC T4
On request with DVGW approval for natural gas (up to 16 bar)
Pressure range up to 50 bar, special version up to 100 bar
Temperature range up to 180 °C
No moving parts, no wearout
Sensor tip very robust, easy to clean
Easy mounting and dismounting under pressure via 1/2“ ball valve
Housing twistable, display twistable by 180°
Safety ring for mounting and dismounting under pressure
Depth scale for precise installation

VA 550 Flow sensor, measuring head in robust aluminium die cast housing			0695 0550

Measuring range:			Bestell-Code
A1 - Standard version (92,7 m/s)			A1
A2 - Max version (185 m/s)			A2
A3 - High-Speed version (224 m/s)			A3

Screw-in thread:
B1 - G 1/2" outer thread			B1
B2 - NPT 1/2" outer thread			B2
B3 - PT 1/2" outer thread			B3

Mounting length / shaft length:
C1 - 220 mm			C1
C2 - 300 mm			C2
C3 - 400 mm			C3
C4 - 500 mm			C4
C5 - 600 mm			C5
C7 - 160 mm			C7

Option display:
D1 - with integrated display			D1
D2 - without display			D2

Option signal outputs / bus connection:
E1 - 2x4...20mA a. output,galv.isolated,pulse output RS485 Modbus-RTU			E1
E4 - 1x4…20mA analogue output (not galv. isolated), pulse output, RS 485 (Modbus RTU)			E4
E5 - Ethernet-Interface (Modbus/TCP), 1 x 4…20 mA analogue output (not galvanically isolated), pulse output, RS 485 (Modbus-RTU)			E5
E7 - 2x4..20mA analogue output passive,pulse output RS485 (Mb-RTU)			E7
E8 - M-Bus (Z6955504)			E8
E9 - Ethernet-Interface PoE (Power over Ethernet) (Modbus/TCP), 1 x 4…20 mA analogue output (not galvanically isolated), pulse output, RS 485 (Modbus-RTU)			E9

Calibration:
F1 - no real gas calibration - gas adjustment via gas constant			F1
F2 - real gas calibration in the gas type as selected below			F2

Gas type:
G1 - Compressed air			G1
G2 - Nitrogen (N2)			G2
G3 - Argon (Ar)			G3
G4 - Carbon dioxide (CO2)			G4
G5 - Oxygen (O2)			G5
G6 - Nitrous Oxide (N2O)			G6
G7 - Natural gas (NG)			G7
G8 - Helium (He) - Real gas calibration required			G8
G9 - Propane (C3H8) - Real gas calibration required			G9
G10 - Methane (CH4)			G10
G11 - Biogas (Methane 50% : CO2 50%)			G11
G12 - Hydrogen (H2) - Real gas calibration required			G12
G90 -Further gas			G90
G91 - Gas mixture			G91

5. Đồng hồ đo lưu lượng khí oxy CS Instruments

Flow sensor with integrated measuring section | VA 420 CS Instruments

Easy and affordable installation
Units freely selectable via keypad m³/h, m³/min, l/min, l/s, kg/h, kg/min, kg/s, cfm
Compressed air counter up to 1,999,999,999 m³, Resetable to "zero" via keypad
Analogue output 4...20 mA, pulse output (galvanically separated)
High measuring accuracy also in the lower measuring range (ideal for leakage measurement)
Negligibly small loss of pressure
Calorimetric measuring principle, no additional pressure and temperature measurement necessary, no mechanically moved parts
Gas types adjustable via software (nitrogen, oxygen, CO2, nitrous oxide, argon)

6. Máy đo lưu lượng khí CS Instruments

VA570 CS Instruments

VA 570 - Flow sensor with integrated measuring section			Order no.
VA 570 Flow sensor with integrated 1/2" measuring section			0695 0570
VA 570 Flow sensor with integrated 3/4" measuring section			0695 0571
VA 570 Flow sensor with integrated 1" measuring section			0695 0572
VA 570 Flow sensor with integrated 1 1/4" measuring section			0695 0573
VA 570 Flow sensor with integrated 1 1/2" measuring section			0695 0574
VA 570 Flow sensor with integrated 2" measuring section			0695 0575
VA 570 Flow sensor with integrated DN 15 measuring section with weld neck flange			0695 2570
VA 570 Flow sensor with integrated DN 20 measuring section with weld neck flange			0695 2571
VA 570 Flow sensor with integrated DN 25 measuring section with weld neck flange			0695 2572
VA 570 Flow sensor with integrated DN 32 measuring section with weld neck flange			0695 2573
VA 570 Flow sensor with integrated DN 40 measuring section with weld neck flange			0695 2574
VA 570 Flow sensor with integrated DN 50 measuring section with weld neck flange			0695 2575
VA 570 Flow sensor with integrated DN 65 measuring section with weld neck flange			0695 2576
VA 570 Flow sensor with integrated DN 80 measuring section with weld neck flange			0695 2577

7. Cảm biến lưu lượng khí CS Instruments

Flow sensor for compressed air and gases | VA 400 CS Instruments

Integrated display for m³/h and m³
Depth scale for accurate installation
Usable from 1/2" to 12" (DN 300)
Easy installation under pressure
4...20 mA analogue output for m³/h resp. m³/min
Pulse output for m³
Inner diameter adjustable via keypad
Consumption counter resettable

8. Đo điểm sương CS Instruments

Thiết bị đo điểm sương CS Instruments thường được dùng đo độ động sương trong máy nén khí, và nhiều thiết bị khác.

Máy đo khí cầm tay PI 500 CS Instruments

Bộ ghi dữ diệu DS 400, DS 400 SET CS Instruments

Dew point set DS 400 for desiccant driers (-80…+20°Ctd)			0601 0510
consisting of:
Chart recorder DS 400			0500 4000
FA 510 dew point sensor for desiccant driers incl. inspection certificate, 4…20 mA output signal (3-wire connection) and Modbus-RTU interface (-80…+20°Ctd)			0699 0510
Standard measuring chamber up to 16 bar			0699 3390
Connection cable for VA/FA, 5 m with M12 plug			0553 0104
Dew point set DS 400 for refrigeration driers (-20…+50°Ctd)			0601 0512
consisting of:
Chart recorder DS 400			0500 4000
FA 510 dew point sensor for refrigertation driers incl. inspection certificate, 4…20 mA output signal (3-wire connection) and Modbus-RTU interface (-20…+50°Ctd)			0699 0512
Standard measuring chamber up to 16 bar			0699 3390
Connection cable for VA/FA, 5 m with M12 plug			0553 0104

Optionen:
Integrated data logger for 100 million measured values			Z500 4002
Integrierte Ethernet- und RS 485 Schnittstelle			Z500 4004
2 additional sensor inputs for analogue sensors (like: pressure, temperautre sensors ...)			Z500 4001
2 additional sensor inputs for digital sensors (SDI/Modbus)			Z500 4003
Integrated Webserver			Z500 4005
CS Soft Basic - data evaluation in graphic and table form, reading out of the measured data via USB or Ethernet			0554 7040
Alarm device assembled			Z500 0003
Alarm device for external assembly incl. 5 m cable			Z500 0004
Calibration and adjustment:
Precision calibration at -40 °Ctd or 3°Ctd including ISO certificate			0699 3396

Thiết bị đo điểm sương cầm tay DP 510 CS Instruments

Cảm biến điểm sương FA 500, FA550 CS Instruments

FA 500 dew point sensor for refrigeration driers, -20...50°Ctd			0699 0501
FA 500 dew point sensor for desiccant driers, -80...20°Ctd			0699 0502
FA 500 dew point sensor, -60...30°Ctd			0699 0503

Options:
Ethernet-Interface for VA500/VA520, FA500			Z695 5006
Ethernet-Interface PoE for VA500/VA520, FA500			Z695 5007
M-Bus (pulse output not available)			Z695 5004
Option analogue output FA5xx, Special version 2…10 Volt			Z699 0510
Option max. pressure FA5xx 350 bar			Z699 0515
Option max. pressure FA5xx 500 bar			Z699 0516
Option special scaling FA5xx 4…20 mA=__ … __ g/m³, ppm etc.			Z699 0514
Option connection thread FA5xx, 5/8" UNF			Z699 0511
Option connection thread FA5xx, 1/2" NPT			Z699 0512
Option surface condition FA5xx, free of oil & grease			Z699 0517