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273	273
274	274	Installation Photo as reference:
275	275
276		-**Submerged installation:**
	276	+(% style="color:blue" %)**Submerged installation:**
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278	278	The lead wire of the equipment passes through the waterproof pipe, and the 3/4 thread on the top of the equipment is connected to the 3/4 thread of the waterproof pipe with raw tape. Ensure that the top of the equipment and the equipment wire are not flooded.
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280	280	[[image:image-20240718191348-6.png]]
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282		-**Pipeline installation:**
	282	+(% style="color:blue" %)**Pipeline installation:**
283	283
284	284	Connect the equipment to the pipeline through the 3/4 thread.
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286	286	[[image:image-20240718191336-5.png||height="239" width="326"]]
287	287
288		-**Sampling:**
	288	+(% style="color:blue" %)**Sampling:**
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290	290	Take representative water samples according to sampling requirements. If it is inconvenient to take samples, you can also put the electrode into the solution to be tested and read the output data. After a period of time, take out the electrode and clean it.
291	291
292		-**Measure the pH of the water sample:**
	292	+(% style="color:blue" %)**Measure the pH of the water sample:**
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294	294	First rinse the electrode with distilled water, then rinse it with the water sample, then immerse the electrode in the sample, carefully shake the test cup or stir it to accelerate the electrode balance, let it stand, and record the pH value when the reading is stable.
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309	309	The equipment should be calibrated before each use. For long-term use, it is recommended to calibrate once every 3 months. The calibration frequency should be adjusted appropriately according to different application conditions (degree of dirt in the application, deposition of chemical substances, etc.). After aging, the electrodes should be replaced in time.
310	310	)))
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	312	+
312	312	== 2.6 RS485 Commands ==
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	315	+
314	314	RS485 signaldefault address 0x10
315	315	Standard Modbus-RTU protocol, baud rate: 9600; check bit: none; data bit: 8; stop bit: 1
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	319	+
317	317	=== 2.6.1 Query address ===
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	322	+
319	319	send
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321	321	(% border="1" cellspacing="3" style="background-color:#f2f2f2; width:676.25px" %)
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328	328	|=(% style="width: 50px;background-color:#4F81BD;color:white" %)New address|=(% style="width: 50px;background-color:#4F81BD;color:white" %)Function code|=(% style="width: 106px; background-color: rgb(79, 129, 189); color: white;" %)Data length|=(% style="width: 93px; background-color: rgb(79, 129, 189); color: white;" %)CRC16 low|=(% style="width: 104px; background-color: rgb(79, 129, 189); color: white;" %)CRC16 high
329	329	|(% style="width:99px" %)0X01|(% style="width:112px" %)0X03|(% style="width:106px" %)0X00|(% style="width:93px" %)0X20|(% style="width:104px" %)0XF0
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	335	+
331	331	=== 2.6.2 Change address ===
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333	333	For example: Change the address of the sensor with address 1 to 2, master → slave