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291UHM050 - 400 Accurate Water Flow Ultrasonic BTU Meter

The 91UHM050-400 Ultrasonic BTU meter is a high-quality device designed for accurate measurement of water flow rates and temperatures. With a Class A environmental grade, PN16/PN25 pressure grade, and IP65 protection, this meter is suitable for a wide range of applications. It is capable of measuring water temperatures from 2 to 95℃ and temperature differences from 2 to 85 K, making it an ideal choice for monitoring energy consumption in heating systems. Installation is versatile, allowing for horizontal or vertical placement on either the supply or return pipe.

● Environmental grade: Class A（GB/T32224 or EN1434）
● Pressure grade: PN16/PN25（Default is PN16）

● IP grade: IP65

● Medium: Water

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Features

● Environmental grade: Class A (GB/T32224 or EN1434).

● Pressure grade: PN16/PN25 (Default is PN16).

● IP grade: IP65.

● Medium: Water.

● Medium temperature range: 2～95℃.

● Medium temperature difference range：2～85 K.

● Installation requirement: Horizontal or vertical installation (See installation instructions for details.).

● Installation position: Supply pipe/return pipe (Default to install on supply pipe).

Main parameter

Diameter	DN50～DN400
Accuracy	EN1434 or GB/T32224 Class 2
Flow range	50：1
Protection grade	IP65
Temperature range	2～95℃
Temperature difference	2～85 K
Power supply	（M-BUS meter bus supply& battery supply）or battery supply only	DC24V external power supply & battery supply
Communication interface	M-Bus、Photoelectric reading head	RS485、Photoelectric reading head
Protocol	Basic、EN13757、CJ188	MODBUS RTU、BACnet MS/TP

Dimensions

Flow code	DN(mm)	Height H(mm)	D(mm)	Length L（mm）	D1	n-M
N15	50	356	165	200	125	4-M16
N25	65	376	185	200	145	4-M16
N40	80	390	200	225	160	8-M16
N60	100	410	220	250	180	8-M16
N100	125	437	250	250	210	8-M16
N150	150	467	285	300	240	8-M20
N250	200	525	340	350	295	12-M20
N400	250	625	405	450	355	12-M22
N600	300	680	460	500	410	12-M22
N800	350	735	520	550	470	16-M22
N1000	400	790	580	600	525	16-M26

Flow code	Diameter DN(mm)	Height H(mm)	D(mm)	Length L（mm）	D1	n-M
N400	250	460	405	450	355	12-M22
N600	300	503	460	500	410	12-M22
N800	350	560	520	550	470	16-M22
N1000	400	613	580	600	525	16-M26

Transportation & Storage

● Handle the instrument carefully during transportation to avoid severe impact.

● Storage environment temperature (-25 ～ 55) ℃, relative humidity is less than 80%, prevent strong electromagnetic field and direct sunlight.

● The product stored at least 30cm away from the ground, at least 1m away from the four walls, and no less than 2m away from the heating equipment.

● Keep the warehouse dry and free of corrosive materials, gases and dangerous goods.

Water meter user manual (V2)

PDF

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