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1. Wiring diagram of ultrasonic flowmeter
Ultrasonic flowmeter wiring is mainly divided into two parts: host wiring and probe wiring. There are differences between different brands and models, and it is necessary to follow the product manual for accuracy. 1. Power input for host wiring: Supports AC 220V or DC 24V power supply. Choose one of them according to the wiring diagram. Sensor interface: - Downstream probe connected
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2. Terminal 3 (GND, DN -, DN+), usually only need to be connected to DN - and DN+(terminals 2 and 3) - Upstream probe connected
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5. Terminal 6 (GND, UP -, UP+), usually only need to be connected to UP - and UP+(terminals 5 and 6) 4-20mA output: AO terminal connected to signal positive pole, 24V - terminal connected to signal negative pole 485 communication: connect 485 OUT A and 485 OUT B terminals Heat meter function: - Water supply terminal connected to TX
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1. GND - Return terminal TX
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2. GND (supply and return GND are connected together) Relay output: Connect RELAY+and RELAY - terminals 2. Probe wiring Probe cables usually include shielded wires, signal positive (+) and signal negative (-) terminals. Conventional connections only require connecting the+and - terminals, and shielded wires can be omitted. Due to possible differences in terminal definitions and wiring methods among different manufacturers, please make sure to check the wiring diagram provided in the instruction manual before actual wiring.
2. Should the ultrasonic flowmeter in the fire pump room be wired?
The handheld ultrasonic flowmeter used in the fire pump room does not need to be wired.
. It adopts an external clamp installation, with the probe directly attached to the outer wall of the pipeline, powered by batteries, and can measure flow by inputting parameters such as pipe diameter and material when turned on. The entire process does not require pipe breakage, continuous water supply, or power cord connection. Fixed ultrasonic flow meters (such as pipe section or flange type) require wiring, including power lines, 4-20mA signal lines, or RS485 communication lines, for long-term online monitoring and data remote transmission. However, these devices are mostly used for new construction or renovation projects and are not for inspection scenarios. According to the spot parameters of Shanghai Fire Ultrasonic Flow Meter (DN50-DN500, Mingyu brand), portable models are commonly used for on-site testing, emphasizing "instant clamping and testing, instant testing and travel". The 15 hour battery life supports full day inspection, completely avoiding the difficulties of wiring construction.3. What are the well-known brands of steam flow meters?
Currently, well-known brands of steam flow meters are divided into two camps: domestic and international, covering different application scenarios of high, medium, and low-end. Suitable products can be selected according to working condition accuracy, temperature and pressure resistance requirements, and budget.
.1. Domestic Brands 1 Chongqing Qingtian Teke: Southwest flow meter leader, high-end substitute benchmark for domestic steam flow meters. The core products include vortex street, orifice plate, V-cone, ultrasonic flowmeter, etc., with an accuracy of ± 0.5% FS, temperature resistance of -40 ℃ to 350 ℃, and a maximum pressure resistance of 40MPa. Equipped with integrated temperature and pressu