Introduction

In the field of industrial water treatment, HYLD electromagnetic flowmeters have become the preferred choice thanks to their high-precision measurement and stable performance. This article analyzes how to select HQ/TC series electromagnetic flowmeters for technical evaluators from 5 core dimensions: measurement accuracy, medium characteristics, pipe size, installation method, and output signal, ensuring that your water flow sensor perfectly matches the operating conditions.

1. Measurement accuracy: the core indicator for ensuring data reliability

Measurement accuracy is the primary consideration when selecting an electromagnetic flowmeter. For the water treatment industry, Class 0.5 accuracy (error ±0.5%) is the basic requirement, while the TC-DCZHQ model in the HYLD series can achieve Class 0.2 accuracy, making it especially suitable for fields with stringent water quality monitoring requirements such as pharmaceuticals and food. It is worth noting that actual accuracy is affected by the following factors:

• Electrode material: Titanium electrodes are suitable for corrosive media, while Hastelloy C276 is more suitable for water containing chloride ions
• Flow velocity range: It is recommended to keep the flow velocity between 0.3-10m/s; accuracy will decrease if this range is exceeded
• Straight pipe section requirements: At least 5D upstream and 2D downstream straight pipe sections (D is the pipe diameter) are required to ensure nominal accuracy

When evaluating insertion-type flowmeters such as the TC-CDC, additional consideration should be given to the impact of probe insertion depth on the measurement cross-section, and the pipe fill rate is generally required to be ≥80%.

2. Medium characteristics: matching rules for lining and electrodes

Different water qualities have differentiated requirements for the flowmeter lining and electrodes:

For intelligent flowmeters such as the TC-ZNDC, the equipped conductivity self-adaptation function can automatically compensate for changes in medium conductivity (the range must be above 5μS/cm), which is particularly critical when treating reclaimed water.

3. Pipe size: full-coverage solutions from DN15 to DN3000

The HYLD series provides 3 adaptation solutions:

3.1 Inline installation

The standard pipe diameter is DN15-DN600. For example, the HQ electromagnetic flowmeter uses a flange connection, complies with the GB/T9119 standard, and offers optional pressure ratings of PN10/16/25.

3.2 Insertion installation

Suitable for pipelines above DN200, the TC-DCGD model uses a V-cone sensor and only requires opening a Φ22mm hole in the pipeline during installation, making it especially suitable for retrofit projects.

3.3 Customized solutions

For water transmission pipelines above DN1000, the TC-DCZHQ split-type design is recommended, with a maximum distance of 30 meters between the sensor and the converter.

4. Installation method: technical points for horizontal/vertical/inclined pipelines

Improper installation can lead to a measurement error increase of more than 30%:

• Horizontal pipeline: The electrode axis should be parallel to the horizontal plane to avoid air bubble accumulation
• Vertical pipeline: The medium must flow from bottom to top, and the full-pipe rate can reach 100%
• Inclined pipeline: When the inclination angle is ≥15°, an air release valve needs to be installed; refer to the anti-air-pocket design of the TC-CDC

When selecting an insertion-type water flow transmitter, special attention should be paid to the following: the probe should be inserted into the center area of the pipeline (where the flow velocity is the highest), and the flow direction arrow must be consistent with the actual flow direction of the medium.

5. Output signal: application-based selection between 4-20mA and pulse output

Modern electromagnetic flowmeters generally support multiple output combinations:

1. 4-20mA+HART: Standard configuration for TC-ZNDC, transmission distance up to 1500 meters, with strong anti-interference capability
2. Pulse output: Each liter of water corresponds to 1 pulse, suitable for batching control scenarios
3. RS485 Modbus: Supports networking of up to 31 devices, with adjustable baud rates from 9600-115200

For operating conditions requiring on-site display, the TC-GYDC is equipped with an LCD backlit display screen, which can simultaneously show instantaneous flow (m³/h) and totalized flow (m³), with a protection rating of IP67.

Summary and professional recommendations

When selecting a HYLD electromagnetic flowmeter, it is recommended that technical evaluators make decisions according to the following process: confirm medium characteristics → determine accuracy requirements → measure pipe diameter → select installation method → configure output signals. As a national high-tech enterprise, Xi'an Shenghongchuang Instrumentation Co., Ltd. has all HQ/TC series products certified to ISO9001 and provides a 3-year warranty service.

Contact our technical engineers now to obtain an electromagnetic flowmeter selection solution and quotation list tailored to your specific operating conditions.