Flowmeter AT 7185

Flow range with inductive metering principle for measuring flows on conductive fluids in closed pipe systems. Suitable for most media like cold water and warm water, sewage water mm. Used for process control and distribution facilities. Can be used for thermal energy measurement.

Dimension range	DN 15 to DN 1200
PN	10 to 16
Temperature range	-10ºC to +70ºC, short term +90ºC (as an option -20ºC to 130ºC PTFE lining)
Material	NBR alternatively.EPDM

Variations
Product information

Variations

Article number	Amount
AT 7185-
AT 7185-E
AT 7185-P
AT 7185-MAG5
AT 7185-MAG6
AT 7185WALL
AT 7185SUB
AT 7185-10C
AT 7185-10SC

Product information

Main facts

Dimension range	PN	Temperature range	Material
DN 15-1200	16/10	-10°C to 70 ºC (short term 90 ºC)	Carbon steel, Lining: NBR alt. EPDM

Range application

For measuring flows on conductive fluid in closed pipe systems. Suitable for most media like cold water, hot water, sewage water and other types of corrosive fluids with different viscosity. Used for process control and distribution facilities.

Program text

UGE.35 Meter for flow, pipe mounted with digital display accumulated value
Flow meter, magnetically inductive, AT 7185, DN ..... PN... Internal lining of..... Signal converter compact (alternatively wall mounted) type AT 7185 alt. MAG6.

Quality assurance

EMC 2004/1087EG, LVD 2006/95/EG, MID 2004/22/EG, PED AFS 1994:4. Certified according to FM class 1 div 2. Drinking water approval is available for EPDM-lining.

Material specification

1	Body and flanges	Carbon steel ST 37.2, two-component epoxy coating (Corrosivity category C4)
2	Lining	NBR hard rubber (standard) alt. EPDM
3	Electrodes	Hastelloy C276
4	Signal converter	Fiberglass reinforced polyamide

Dimensions and weight

DN	A *)	B	C	Vikt **)
	EN 1092-1 PN 16	Excluding signal converter	Including signal converter
50	200	188	341	9
65	200	194	347	11
80	200	200	353	12
100	250	207	360	15
125	250	217	370	20
150	300	232	385	26
200	350	257	410	48
250	450	284	437	69
300	500	310	463	86
350	550	382	535	115
400	600	407	560	125
500	600	463	616	189
600	600	514	667	301
700	700	564	717	320
800	800	616	769	428
900	900	663	816	619
1000	1000	714	867	636
1200	1200	820	973	813
Dimensions in mm, weight in kg
All flange dimensions according to EN 1092-1 (or ANSI B 16.5 on request)
*) If grounding flanges are mounted as an option, these and the strainer need to be added to the height.
**) With mounted signal converter MAG6000/5000 increases the weight with roughly 1 kg.

Function and design

The meter principle based on Faraday's induction law that says that when a conductor(fluid) moves through a magnetic field(meter pipe) it creates an induced current. This current is directly proportional to the flow. The meter readings is handled by the signal converter which gives the desired output signal. A prerequisite is that the conductive ability of the fluid is over 5 mikroS/cm.

The flow meter consists of a meter pipe, completely without movable parts and a signal converter that is mounted directly on the meter pipe or separately on a wall. The meter pipe is provided with a lining to decrease the risk for internal build up. The lining is selected based on the area of use, temperature etc. grounding electrodes are integrated in the meter pipe.

Signal converter MAG 5000
Wide meter area with high accuracy (± 0,4% of measured value). LCD-indicator for reading. Doesn't need calibration. Equipped with self diagnosis, automatic zero point adjustment and indicated an empty meter pipe and flow direction signal. Is available with type approval for cold water.

Signal converter MAG 6000
Very high accuracy (±0,2% of measured value). Dosing function. Limit alarm. In other aspects similar to MAG 5000.

Technical data

Meter pipe MAG 5100W
Flow range	See connection in table
Meter accuracy	±0,5 %, see chart
Pressure loss at 3 m/sec.	DN 50-300 (down coned 1 DN): max. 25 mbar
	DN 350-1200: as straight pipe
Lowest conduction ability of media	5 mikroS/cm
Protection class	IP 67 enl. EN 60529, 1 mvp under 30 min.
Flanges	According to EN 1092-1 (ANSI B16.5 as option)

Pressure and temperature

Pressure and temperature
Pressure	DN15...DN40	PN 40
	DN 50... DN 150	PN 16
	DN 200... DN 1200	PN 10 (DN 200..DN1200 option PN16)
Media temperature	DN 15... DN 1200	-10...70 °C

Technical information signal booster

Signal converter
Accuracy	MAG5000	±0,4%
	MAG6000	±0,2%
Operational current		115/230 V AC (alternatively 24 V AC/DC, 11...30 V)
Protection class		IP 67 according to IEC 529 and DIN 40050, 1 mvp under 30 min.
Surrounding temperature	During operation	-20 till +50°C
	Storage	-40 till +70°C
Signal output	Analog	0-20 mA eller 4-20 mA
	Resistance	<800 ohm
	Tidskonstant	0,1-30 s. adjustable
Digital output	Frequency	0-10 kHz 50% cycle
	Time constant	0,1-30 s. adjustable
	Active	24 V DC, 30 mA, 1 K Ω≤R_load≤ 10 K Ω
	Passive	3-30 V DC max. 110 mA, 200 Ω ≤R_load≤ 10 K Ω
Relay		Change-over relay
	Current	42 V AC/2 A, 24 V DC/1A
Digital input		11-30 V DC, Ri=4,4 k Ω
	activation time	50 ms
	Current	I₁₁ V DC = 2,5 mA, I₃₀ V DC = 7 mA
Functions		instantaneous and total flow, stop function by low flow or empty pipe,
		Indication of flow direction, error messages, run time, limit switch,
		uni/bidirectional flow, pulse output, control of cleaning and dosing 1)
Galvanically isolated		All in- and outputs are galvanically isolated
Stop function	Low flow	0-9,9% of max flow
	Empty pipe	Detection of empty meter pipe
Counter		Two eight figure counters for front, net and back flow
Display		LCD-display with back lighting with alpha numerical text,
		3 x 20 characters for indication of flow, total readings, settings and error messages
		Back flows are indicated with negative characters.
	Time constant	Time constant as actual output
Zero point adjustment		Automatic
Electrode input impedance		> 1 x 10¹⁴ Ω
Communication	Standard	Prepared for additional client mounted modules
1) Only MAG 6000

Sizing

The graph below shows the relation between flow speed, V, flow quantity, Q and the flow meter dimension DN.

Selection of flow meter
For sizing pick approtiate meter that gives a flow speed withing 2...3 m/s or more is recommended. This is partly to secure a good gauging accuracy, but also to prevent build up on the electrodes and insulation lining in the meter pipe. This gives in general at least one dimension less on the meter than the pipe line. In that case control that the pressure loss in the down cone doesn't get to large.

For measuring fluids with a high particle content the flow speed should be within 3...5 m/s or more to prevent internal build up.

Accessories and variants

Description		Artikelnr.
Signal converter MAG 5000	Wide range with high accuracy (±0,4 % of measured reading).
	LCD-indicator for reading. Does not need calibration.
	Equipped with self diagnosis, automatic zero point adjustment and indicates empty meter pipe and flow direction signal.	AT 7185-MAG5
Signal converter MAG 6000	Very high accuracy (±0,2 % of measured reading).
	Dosing function. Limit alarm. In other aspects similar to MAG 5000.	AT 7185-MAG6
Meter pipe lining	Alternate material, PTFE-teflon (temp. area-20...130 alt. 180 °C).
	Used for e.g. in Glycol- and larger heating systems.	se How to order
Pressure class	Option PN 16 DN 200-1200	se How to order
Capsule kit	Submersible performance (IP 68, 10 mvp in 10 years) for use with
	standard MAG 5000 signal converter, when the meter pipe is buried or submersed.	AT 7185SUB
Grounding/protection flange	Type C. Extra grounding ring (e.g. DN 100)	AT 7185-100J
Wall mounting kit	To IP 67 version. Including wall mounts and 5 st. Pg13 screwed cable entries.	AT 7185WALL
Standard electrodes and signal cable	3 x 1,5 mm² PVC in the lengths: 10 m, 20 m, 40 m, 60 m and 100 m. (t.ex. 10 m.)	AT 7185-10C
Special electrodes and signal cable	Double screened PVC (recommended for long distances and when
	detection of empty pipe is used).
	Available in the lengths: 10 m, 20 m, 40 m, 60 m and 100 m. (e.g. 10 m.)	AT 7185-10CS

Variants

When there is ethanol in the water, use EPDM lining. MAG meter in smaller dimensions, with battery or other lining for higher temperatures etc. on request.

Installation

The flow meter can be installed so that the meter pipe is always filled with liquid, in horizontal mode or vertically. Avoid high points or dropping pipes.

Straight lines of at least 5xD before the meter and 3xD after is required. Eventual down coning can be used on the straight. Choose a position where the flow isn't pulsating and avoid places where the meter is exposed to electromagnetic interferance.

With media temperatures > 90^oC compact mounting with signal converter on the meter pipe not possible. Use signal cable (e.g. AT 7185-10C) and wall mounting kit (AT 7185WALL).

In other cases, please see the separate instruktion manual.

Maintenance and spare parts

Since the flow meter doesn't have any movable parts, it's basically maintenance free. The only maintenance requirement is cleaning the meter pipe and electrodes. There is also a possibility to replace electrodes, and if these get affected, to alternative materials.

Marking

The meter pipe and the signal converter are marked with serial number, size, electric data mm.

How to order

AT 7185	-100	P	-PN16
Meter pipe (NOTE! Signal converter are ordered separately, see next How to order)
Example: AT 7185-100P-PN16
Fig. nr.	DN	Lining (option)	Pressure class (option)
		NBR hard rubber (standard)	PN 16 for DN 200-1200