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| Maintenance tips for differential pressure transmitters |
| 2011-11-23 14:06:25 |
The differential pressure transmitter is a very widely used instrument at present, so its care and maintenance become very important. The specific method is described below
调查法：回顾故障发生前的打火、冒烟、异味、供电变化、雷击、潮湿、 误操作、误维修。 1. Investigation method: review the fire, smoke, odor, power supply change, lightning strike, humidity, misoperation, and maintenance before the fault occurred.
直观法：观察回路的外部损伤、导压管的泄漏，回路的过热，供电开关状态等。 2. Intuitive method: observe the external damage of the circuit, the leakage of the pressure guiding tube, the overheating of the circuit, the state of the power switch, etc.
差压变送器 不能正常Hart远程通讯，可将电源从表体上断开，用现场另加电源的方法为变送器通电进行通讯，以查看是否电缆是否叠加约2kHz的电磁信号而干扰通讯。 3. Detection method: Open circuit detection: Separate the part suspected of being faulty from other parts, and check whether the fault disappears. If it disappears, determine the fault, otherwise, you can find the next step, such as: the differential pressure transmitter cannot work normally. Hart For remote communication, the power can be disconnected from the meter body, and the transmitter can be powered on by the method of additional power on site to check whether the cable is superimposed with an electromagnetic signal of about 2kHz and interferes with the communication. Short circuit detection: Under the condition of ensuring safety, short the relevant part of the circuit directly, such as: the output value of the differential transmitter is too small, the pressure guiding tube can be disconnected, and the differential pressure signal can be directly led from outside the pressure taking valve. Go to both sides of the differential pressure transmitter and observe the output of the transmitter to determine the continuity of the blockage and leakage of the pressure-conducting pipeline. Replacement test: Replace the suspected faulty part to determine the faulty part.
怀疑变送器电路板发生故障，可临时更换一块，以确定原因。 For example, if the differential pressure transmitter suspects that the transmitter circuit board is malfunctioning, temporarily replace one to determine the cause. Sub-division detection: Divide the measurement circuit into several parts, such as: power supply, signal output, signal transmission, signal detection, check by sub-section, from simple to complex, from the table and the inside, narrow down the scope and find the fault location.