Model: CJDMF-1-CR

Description

Insert Tuning Fork Density Meter is a new product which is based on the principle of vibration. Product design using plug-in installation, is widely used in the pipeline, the medium density detection, container open, closed container in the product in the mud slurry, evaporator, solvent separation, oil measurement and other fields. The density of the fluid directly dependents on vibration frequency which tuning fork receives when sensor inserts into media. Sensor’s built-in temperature sensor provides temperature compensation

 

Application

CJDMF-1-CR insertion density meter could apply the on-line density testing. It could be applied in the product process controlling based on the basic parameters of density, or the mass controlling system as the solid percentage or the concentration for references.

 

Feature

Plug in design, plug and play, and continuous online measurement

No moving parts, maintenance free, anti-corrosion design for specific conditions

Temperature compensation

Customize rod length

The environment is not sensitive to vibration, and the short rod type is suitable for high

pressure pipeline (maximum pressure 20Mpa)

 

Working Principle

The sensor is based on the principle of component vibration, and the component part is a part of tuning fork immersed in measured liquid. The tuning fork induces vibration by a piezoelectric device fixed at one end of bottom of the fork. The vibration frequency is detected by two piezoelectric devices fixed at the other end of the fork, and then signal is amplified through the top of the circuit. The liquid density is closely related to the vibration frequency of measured liquid when measured liquid is streaming. When the measured liquid density changes, the vibration frequency of it also changes when the measured liquid is streaming.The density of the measured liquid can be calculated accurately by equation.

 

Technical Parameters

Density Range	0.5 – 2.5 g /cc (500 – 2500 kg/m3)
Calibration Range	0.8 – 1.2 g /cc (800 – 1200 kg/m3)
Accuracy	± 0.002 g /cc (± 2 kg/m3)
Repeatability	± 0.0002 g /cc (± 0.2 kg/m3)
Temperature Range (Process)	-50°C ~ +200°C
Pressure Rating	10MPa ~ 20MPa
Viscosity Range	0 – 20000 cP
Temperature Effect	> 0.1 kg/m3/°C (adjusted)
Impact from Pressure	none
Built-in Temperature Sensor	PT100
Wetted Parts	Stainless steel 316L Hastelloy alloy
Tine Finish	Standard, PFA coated, or Electro-polished
Power supply	24VDC,≥50 mA
Outputs	4 -20 mA,0-1000Hz,RS485 Modbus RTU
Density accuracy - process(20°C)	± 0.1% or ± 0.05% FS of indicated figures
Repeatability - process(-40 ~ +85°C)	± 0.05% FS
Process connection	ANSI 150 ~ 1500 RF DIN 50 PN16 DIN 50 PN40 IDF and RJT hygienic type
Defensibility	IP65
Outer Covering	Aluminum alloy

 

Calculation of Fluid Measurement

V = Q / (1/4 *π*d²)

Eg: flow rate20m³/h,pipe diameter 100mm

V = 20 / 3600 / (1/4 * 3.14 * 0.1 * 0.1) = 0.7m/sec

 

Installation

1.      Demonstration of tubes installation

To ensure the stabilities of measurement accuracy and the stable display, when the flow velocity of the liquid is higher than 0.5m/s:

l  If the size of the pipeline is higher than DN 100:

It would be advisable to apply the necking installation on the vertical or horizontal pipeline.

l  If the size of the pipeline is smaller than DN 100:

It would be advisable to enlarge of the pipeline and apply the necking Installation. In addition to this, it is necessary to have a certain distance of straight tube of both size to make sure the liquid flowing through the tubes are under the situation of laminar conditions, which is shown as the figure below.

Cautions

1.        Do not cause any physical damage to the meter.

2.        Do not measure incompatible fluid.

3.        Do not operate the device if exceeding its rated pressure or maximum temperature.

4.        Do not do any pressure test beyond the specified test pressure.

5.        Do not expose the meter to excessive vibration (> 0.5 g continuous).

6.        Do not modify this instrument in any way (mechanical or electrical), otherwise the factory warranty will be invalidated. This meter can be ordered with Zirconium wetted parts. In this case, mechanical modifications of any kind may produce a safety hazard and must not be performed.

7.        Do not exceed the stated supply voltage range, otherwise the meter may be damaged and a hazard may exist.

8.        Ensure all explosion-proof requirements have been applied.

9.        Ensure the meter and associated pipe work are pressure tested to 1-1/2 times at the maximum operating pressure after installation.

10.    Ensure the transmitter outer covers are tightened properly after wiring to maintain ingress protection.

11.    Be aware of handling PFA-coated tines as the coating is not resistant to any impact.

Always keep the protective cover on when the meter is not in use.

12.    Maintain the meter in its original packaging. For the long-stem meters, ensure the transit cover secured by the grub screws.

Appendix I – Address Book of Modbus RTU

No.	Holding register	Address  (16/10 Bit)	Definition	Note
1	41001	0x03E8 / 1000	density
2	41003	0x03EA / 1002	temperature
3	41005	0x03EC / 1004	Frequency rate
4	41007	0x03EE / 1006	Adjusted frequency rate
5	41009	0x03F0 / 1008	Contains of measurement A

 

Demonstration

1. To prevent unnecessary issues which might occur, editing the address info is not recommended

2. Default setting for communication setting:

Data bit:           8

Stop bit:       1

Check:          None

Baud rate:         9600

Station:         1  

Protocol:        Modbus RT

 

Model Selection

Code	production
CR	CJDMF-1-CR Insertion liquid density meter
	code	material
	A	316 Stainless Steel Standard
	B	316 Stainless Steel Electro-polished
	C	304 Stainless Steel Standard
	D	Hastelloy alloy Standard
	E	Hastelloy alloy Electro-polished
	S	Requested preference：::Please inform for particular quirement
		code	Transmission output
		C	4-20mA 0-1000Hz     RS485 Modbus RTU
			code	Transmission device cover case
			B	Aluminum alloy
				code	Connection process
				16	50mmGB/T 9123.1-2000 RF DN50/PN1.6
				40	50mmGB/T 9123.1-2000 RF DN50/PN4.0
				XX	Requested preference：Please inform for particular requirement
					code	length
					150	Standard length 150mm
					XXX	User length
						code	Marked edge
						A	inserted directly
						C	DN50 sloping attached pipe Standard
						E	DN50 sloping attached pipe Hygienic
						T	Please inform for particular requirement
							code	Original setting
							G	Options for original setting
CR        A          C         B        40         150         A          G              Typical module selection