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EHM410 Electrometric Flowmeter Heat Meter and Cold Meter 1

EHM410 Electrometric Flowmeter Heat Meter and Cold Meter 2

EHM410 Electrometric Flowmeter Heat Meter and Cold Meter 3

EHM410 Electrometric Flowmeter Heat Meter and Cold Meter

When meter works with sensors and conductivity of measuring flow is larger than 50μS/cm, under this circumstance, PVVPB 2*0.12*280mm2 model cable (metal shielded signal line covered with PVC) can be used as communication cable for flow signals. The length of signal cable should be less than 100m.

Signal lines have to be connected to sensors that were assembled by producers. The meter can output equivalent level of exciting shielded signal voltage so that interference on flow measurement signals can reduced by means of decreasing the distributed capacitance of communication cable.

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Basic function

● Low frequency square wave excitation, excitation frequency: 1/ 10 Power frequency, 1/ 12 Power frequency;

● Exciting Current: 125mA, 250 mA；

● Empty pipe measuring with no additional pole, continuously measuring, alarm by fixed value ;

● Flow velocity measuring range: 0.1 to15m/s, velocity resolution: 0.5mm/s；

● AC high-frequency switching power supply: 85VAC to 250VAC;

● 24V DC switching power supply: 20VDC to 36VDC;

● Network function: MODBUS(Standard), HART(Optional), GPRS(Optional), PROFIBUS(Optional);

● English and Chinese for choosing(Other language is optional);

● Two integrators insides to record flow and heat.

Technical Specifications

● Accuracy: Class 2.

● Installation Method: Horizontal Installation.

● Temperature Class: Cold water: T30(0.1~30℃).

● Working Pressure: 1.0MPa.

● Flow Field Sensitivity Class: U10/D5.

● Pressure Loss Class: △p63.

● Flow Rate Parameters: Q3 /Q1=50 Q4 /Q3=1.25, Q2 /Q1=1.6.

● Maximum Permissible Error: Lower Flow Range (Q1 ≤ Q < Q2): ±5%, Upper Flow Range (Q2 ≤ Q < Q4): ±2%.

Series	Diameter（mm）	Q3(m3/h)	Q3 /Q1
LXLG	50	25	R50
	65	40
	80	63
	100	100
	125	160
	150	250
	200	400
	250	630
	300	1000

Meter Terminal Wiring

Nominal diameter （DN）	15~400mm
Service	Clean Water
Storing/Ambient temperature	+5～+55℃
Ambient humidity	<93%
Environmental class	EN1434／CJ128 A Class
Accuracy class	EN1434／CJ128 2 Class
Flow range	50:1 (default) or 100:1(customize)
Enclosure protection	IP65
Pressure loss	<25kPa/qp
Maximum admissible working pressure	1.6MPa(default)/2.5Mpa(customize)
Temperature difference threshold value	0.3K
Temperature range	2～95℃
Temperature difference range	2～85K
Temperature resolution	0.01℃
Installation	Horizontal or vertical installing is available
Rated voltage	3.6VDC battery	3.6VDC battery+24VDC
Network interface	M-BUS	RS485
Communication Protocol	EN1434, Own protocol	MODBUS RTU
Baud rate	2400bps(8,E,1)	9600bps(8,N,1)
Agency Approvals	CE

Meter Terminal Wiring

Symbols and Description of Terminals:

TRA1	Entry Temperature Input	TRA2	Entry Temperature Input
TRA3	Entry Temperature Input	TRB1	Outlet Temperature Input
TRB2	Outlet Temperature Input	TRB3	Outlet Temperature Input
SIG +	Signal 1	SGND	Signal Ground
SIG-	Signal 2	DRS +	Exciting Shielding 1
DRS-	Exciting Shielding 2	MTDR	Reserve
EXT +	Exciting Current +	EXT-	Exciting Current-
POUT	Frequency Output +	PCOM	Frequency Output Ground
IOUT	Current Output +	ICOM	Current Output Ground
TRX-	Communication Interface	TRX+	Communication Interface
LN-	220V (24V) Power Supply Input	LN+	220V (24V) Power Supply Input

TYPE SELECTION DN50-DN400

Dimensions						Flow-rate
mm						m3/h
DN	L	D	H	D1	n-m	Qmax	Qp	Qmin
50	200	165	250	125	4-M16	30	15	0.3
65	200	185	265	145	4-M16	50	25	0.5
80	225	200	280	160	8-M16	80	40	0.8
100	250	220	310	180	8-M16	120	60	1.2
125	250	250	330	210	8-M16	200	100	2
150	300	285	360	240	8-M20	300	150	3
200	350	340	405	295	12-M20	500	250	5
250	450	405	460	355	12-M22	800	400	8
300	500	460	503	410	12-M22	1200	600	1.2
350	550	520	560	470	16-M22	1600	800	1.6
400	600	580	613	525	16-M26	2000	1000	2

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)

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