Các thông tin cơ bản cho một yêu cầu đo mức sóng radar
(The basic information for an radar level transmitter)

1. Question 1
Môi chất đo (type of fluid) =
Dielectric constant (hằng số điện môi) =
Conductivity (độ dẫn điện) =       (u siemen/cm)
% Concentration (nồng độ %)  =      ?
Slurry % Solid (thành phần rắn) = ?

2. Question 2
Process temperature (Nhiệt độ làm việc) = ?
Nhiệt độ min = (Nhiệt độ min) ?
Nhiệt độ max = (Nhiệt độ max) ?

3. Question 3 :
Process Pressure =        (bar)
Pressure min =      (bar)
Pressure max =     (bar)

4. Question 4 :
Tank Size (kích thước bồn) :
Height (chiều cao) =      (m)
Width (chiều rộng) =      (m)
Unit of measure  =          (m)

5. Question 5:
Tank Material of construction (vật liệu bồn) :
Metal (kim loại ) : yes/no
Plastic (nhựa) : yes/no
Concrete : yes/no
Lined : yes/no
Coated : yes/no

6. Question 6 :
Tank Top (Đỉnh bồn)
Flat (yes/no)
Horizontal Cylinder (yes/no)
Dome (vòm) : (yes/no)
Irregular (bất thường) : (yes/no)
Non-metallic (phi kim loại) (yes/no)

7. Question 7 :
Tank Bottom (Đáy bồn) :
Flat : yes/no
Dish : yes/no
Conde : yes/no

8. Question 8 :
Process connection (Kết nối):
Thread (ren) :               NPT or BSP
Flange (bích) (size/type)  :

9. Question 9
Nozzle (cổ ) :
Height =
Diameter =

10. Question 10 :
Stillwell (metal only) : yes/no
Inside Diameter =

11. Question 11:
Type of filling (vị trí fill môi chất đo) :
Top (yes/no)
Bottom (yes/no)
Side (yes/no)

12. Question 12 :

 Agitation (động/lắc/lung lay) : yes/no ?

During filling : yes/no ?

During empty : yes/no ?

Between fill and empty : yes/no?

13. Question 13:

Turbulence (ồn/nhiễu)

None : yes/no

Light : yes/no

Medium : yes/no

Heavy : yes/no

14. Question 14:

Mixer (Trộn)

Number of Blades (số lá) =

Blade Size (Kích thước lá) =

Number of stages =

Height of each stage =

RPM (Tần số) =

15. Question 15

Foam :

None : yes/no

Light : yes/no

Medium : yes/no

Heavy : yes/no

16. Question 16 :

Does liquid boil and/or flash (chất lỏng có sôi hay tia sáng) : yes/no ?

17. Question 17

Bản vẽ bồn : ?

MPx-xxx-x plastic version with up to 5 switching point and ATEX option

MRx-xxx-x stainless steel version with up to 5 switching points and ATEX option

MZx-xxx-x stainless steel single point version with Marine certificate option

You can see that we can offer either MR type with ATEX certificate or MZ type with Marine certificate but we don’t have a version with both certifcates.

Since you requirement is for a single switch with short immersion length I would recommend the MZ type.

Please also note that for the MR type switch there is a minimum distance from the probe end and from the top of the probe. This means that the minimum immersion length for this kind of switch is 163mm.

I’ve pasted the relevant drawing below for better understanding:

Yêu cầu :

Type of fluid: fish oil

Dielectric constant: εr=2.6

Process temperature= 40-50 °C

Min temperature= 25 °C

Max temperature= 120 °C

Process pressure= 500mbar

Height= 700mm

Tank : Metal

Tank : Top Dome

Tank Bottom : dish

Process connection : DN50 JIS 10K

Stillwell (metal only) : yes , Inside Diameter = 60mm

Type of filling : top

Agitation (movable/shake/slashing) : yes

Turbulence : light

Mixer : none

Foam : light

Giải pháp 1 :

 Guided Microwave Level Transmitters (Microtrek)                                     
Manufacturer : NIVELCO (Hungary)                                        
Model : HPB-407-6                                         
Report Glycerol level                                     
Type: High temperature transmitter + Display                                   
Housing: Aluminium                                      
Probe: Coaxial (Agitated or flowing liquids)                                         
Probe length: 700mm                                   
Diameter Coaxial: 28mm                                              
Probe material: SUS316                                
Process connection: 1'' NPT                                        
Output: 4-20mA + Hart                                 
Explosion proof model                                 
Medium temperature: -30...+ 200 °C                                      
Flange temperature: -30...+ 200 °C                                          
Medium pressure: -1...16 bar                                    
Power supply: 18-35 VDC                                            
Ingress protection: IP65                                               
Electrical protection: Class III                                      
Minimum dielectric constant: εr = 1.4   

Your selection would be the ideal model if the tank would be without still well.

Giải pháp 2:

Microtrek

Model : HPP-410-8

Power Supply : 18...35 VDC

Version : High Temp/ Flange temperature 200 degree C

Housing : Paint coated aluminium with IP65/NEMA 4

Probe size/type : 1.0m for mono rod, 1.4571

Output : 4...20mA + HART

Process connection : 1" NPT

Programming and local indicator : SAP-300

Approval : ATEX Ex II 1 G EEx ia II C T6…T3

 there is a still well then it is not necessary to select the coaxial probe, because the still well and a single rod probe act like a coaxial cable but this is a more cost effective solution 

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The quoted MicroTREK will work reliably in vacuum and with the presence of foam.

we have 3 models we can offer: SAT-304, SAK-305-2 and SAK-305-6. SAT-304-6 is not a valid order code.

You can find all the relevant technical information if you visit our website at the following links:

Unicomm product info: http://nivelco.com/site.php?upar=PRODUCT&pro_id=10073&lang=en

Unicomm coloured brochure: http://nivelco.com/download/pdf/sa30s12a0601b.pdf

Unicomm SAT-304 User’s manual: http://nivelco.com/download/pdf/sat3040a0600h_01.pdf

Unicomm SAK-305 User’s manual: http://nivelco.com/download/pdf/sak3052a0600h_02.pdf

 Price for your reference :

SAT-304 : 8,000,000 VNĐ/each

SAT-305 : 10,000,000 VNĐ/each

SAT-305-6 : 10,700,000 VNĐ/each