Seametrics EM 100 Series Manual de usuario

EM100/102 LOW FLOW

MAGNETIC FLOW METER

INSTRUCTIONS

1-800-975-8153

EM 100/102

LOW-FLOW MAGNETIC FLOW METER

INSTRUCTIONS

EM 100/102 - 025

EM 100/102 - 038

EM 100/102 - 050

GENERAL INFORMATION

FLOW RANGE

SPECIFICATIONS

MATERIALS

Wetted Materials - ● Body: Kynar™ PVDF

● Electrodes: Platinum over titanium

● Internal Seals: Viton™

Housing - ● ABS

POWER

●12-24 VDC, 180 mA

ACCURACY

●+/-1% of reading, above 10% of full scale

●+/-3% of reading, below 10% of full scale

MAXIMUM FLUID TEMPERATURE

●185º F

MAXIMUM PRESSURE

●150 PSI (@ 75º F)

MINIMUM CONDUCTIVITY

●20 microsiemens

OUTPUTS

●Frequency opto isolated 1000 pulse/liter (3785 p/g)

●Optional 4-20 mA opto isolated passive

The EM100 is a 24 VDC-powered electromagnetic flow meter with

chemically-resistant plastic wetted parts, in nominal maximum flow rates of

4, 11, and 30 liters per minute. It uses bipolar DC technology at a frequency

high enough to allow for measurement of pulsating flows from diaphragm-

type chemical metering pumps. All electronics are contained in a single

compact, chemical-resistant housing. This configuration, combined with the

standard pulse and analog outputs, makes the EM100 well suited for OEM

applications. Other applications include remote monitoring of chemical

volume or rate using a computer or PLC.

SIZE NOMINAL FULL SCALE MIN. FOR 1% ACCURACY LOW FLOW CUTOFF

L/MIN. GAL./MIN. GAL./HR. L/MIN. GAL./MIN. GAL./HR. L/MIN. GAL./MIN. GAL./HR

-025 3.8 1 60 .38 0.1 6 .04 .009 .54

-038 11 3 180 1.1 .3 18 0.1 .025 1.5

-050 30 8 480 3.0 .8 48 .25 .065 3.9

The EM100 can be supported by its piping connections

if the piping is rigid and there is no vibration.

Alternatively, the grounding studs can be used for

mounting by inserting them through pre-drilled holes.

Note the centerline distance in the dimensional

drawing below.

INSTALLATION

.83

.62

5.70

2.48

3.75

2.00

2.000

.60

6 FT. LONG

CONTROL CABLE,

6 CONDUCTOR

12 FT. LONG GROUNDING

WIRE WITH LUGS (SUPPLIED)

2 EACH #10 LOCKWASHERS

& #10-24 HEX NUTS (SUPPLIED)

#10-24 STUDS (2), 316

ABS HOUSING

-025

-038

-050

3/8 NPT

1/2 NPT

Size Fittings L (Length)

3.75

4.90

Table 1: Fittings and Length

MALE PIPE FITTING,

PVDF PLASTIC,

2 PLACES;

SEE TABLE 1

CAUTION: Although this meter has

an empty pipe detection function,

under certain conditions of empty

or partially-full pipe the meter may

read a flow when there is none.

If this is a hazardous condition,

mount the meter in such a way as to ensure the meter

will always be full of liquid.

MOUNTING

EM 100/102 SERIES

MAGNETIC FLOW METER INSTRUCTIONS

www.seametrics.com

PIPING

Metallic pipe or tube, or plastic tubing can be used with the meter. The -025 and -038 meters have 3/8 NPT male

pipe fittings, and the -050 has 1/2 NPT male pipe fittings. For plastic tubing, use female NPT x tubing adaptors. In

installations exposed to vibration, using the piping as the sole support for the meter is not recommended, particularly

on the smaller sizes.

If metal piping is used, ground connections from the grounding studs on the bottom of the unit to both inlet and outlet

pipes provide the best results in metering accuracy. This does not apply to plastic tubing. A minimum of 1”of straight

pipe run is recommended on the inlet side of the meter. Straight run is not necessary on the outlet.

CONNECTIONS

Power and signal connections are provided by the single 4 or 6-conductor cable, and are color-coded. See the “wiring

connections”chart. In addition, it is necessary for proper operation to ground the unit to a good quality earth ground.

Use the 12 ft. grounding wire supplied with the unit, or if necessary, a longer wire attached to one or both of the

grounding studs.

WIRING

CONNECTIONS

EM 100/102 SERIES

MAGNETIC FLOW METER INSTRUCTIONS

RED + 12 to 24 VDC Power

BLACK - Power

GREEN + Pulse Output Isolated

WHITE - Pulse Output Isolated

ORANGE + 4-20 mA Isolated

BLUE - 4-20 mA Isolated }Optional

EM100/102 LOW FLOW

MAGNETIC FLOW METER

INSTRUCTIONS

www.seametrics.com

19026 72ND AVE SOUTH, KENT, WA 98032 USA

(P) 253.872.0284 (F) 253.872.0285

WWW.SEAMETRICS.COM 1.800.975.8153

LT-11748-A

Revised 8/03

EM100/102 TROUBLESHOOTING GUIDE

Problem Possible Causes Possible Solutions

Analog output at 0 mA

Analog output is 4 mA

with flow

No pulse output

Flow rate incorrect

No loop power

Unit not grounded

Flow reversed

Reversed output connections

Not grounded

Reversed flow

Missing or incorrect ground wire

Fluid conductivity <20 uS/cm

Empty pipe

4-20 mA loop needs an external

power supply - if missing, add it

Connect to earth ground

Note flow direction arrow, reverse

direction to match

Change output connection

Connect to earth ground

Change flow direction

Check for proper grounding

Select other flow meter

Install meter in vertical position

OPERATION

When the newly-installed meter is first powered up, particularly if it has been dry prior to start up, it can take from

a few seconds to a minute for the signal to stabilize. In normal operation, keeping the meter filled with fluid is

recommended to prevent this delay. An empty pipe detection feature will normally respond to lack of liquid in the

pipe, and will register zero flow, but under certain rare conditions it is possible for this feature to fail to recognize

the empty pipe. See the warning under “Mounting”regarding this possible problem.

The optional 4-20 mA signal outputs 4 mA at zero flow and 20 mA at maximum rated flow. The standard pulse

signal is a 50% duty cycle pulse set at 1000 pulses/liter (3785 pulses/gallon).

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