The EMCO EPSI-STEEM compact orifice flow meters measure the flow of saturated and superheated steam within the process industries, including chemical, petro-chemical, pharmaceutical and the power industry. The EPSISTEEM is especially designed for installations with limited space due to the flow conditioning effect created by the 5 hole design. The EPSI-STEEM is based on the principle of measuring velocity in the pipe line, therefore the flow measurement is volumetric. The EPSI-STEEM flow meters are based on international standards and private information covering flow calculation, manufacturing tolerances, accuracy and installation requirements. This new type of bare bone technology enlarge the number of potential successful applications for DP flow meters in world.

The EPSI-STEEM flow meter features are:

  • Very short straight pipe run requirement
  • Standardised product based on well proven technology.
  • Compact design.
  • Simple construction.
  • Standardised construction means low inventory.
  • No moving parts.
  • Not sensitive to vibrations.
  • The electronics delivers linear to flow output signal.
  • Digital indicator for local flow reading.
  • High accuracy.
  • Wide rangeability.
  • Easy to install.
  • Easy to re-calibrate.
  • Models with integrated manifold valve


epissteem model

Model ES1

The EPSI-STEEM flow meter model ES1 consists of a primary element based on the differential pressure principle, a condensing pot arrangement, a 3 valve manifold and an electronic differential pressure transmitter with digital signal processing.

Model ES2

The EPSI-STEEM flow meter model ES2 consists of a primary element based on the differential pressure principle, an all welded integrated condensing pot arrangement, a 3 valve manifold and an electronic differential pressure transmitter.

Model ES3

The EPSI-STEEM flow meter model ES3 consists of a primary element based on the differential pressure principle, an all welded integrated condensing pot arrangement, with transmitter mounting flange, 3 valve double flanged manifold and an electronic differential pressure transmitter.

The EPSISTEEM flow meter is mounted between flanges in sizes from DN 40 (11⁄2") to DN 400 (16") in pressure ratings up to PN 40 (300 lbs).


Remote electronic indicator with LCD is available for local flow indication and if required check/change of flow rate (differential pressure).

Principle of Measurement

The EPSI-STEEM is a velocity flow meter. A restriction in a pipe line changes the value of the different energies. Based on the law of energy balance developed by Bernoulli the sum of energies remains constant. Increases the velocity in the pipe line decreases the pressure in the restriction. The pressure differential between the inlet pressure and the pressure in the restriction is measured expressing the flow velocity. When the physical values of the fluid is known and the inner pipe diameter is established the electronics calculate the flow rate. The flow rate is expressed in an analogue signal 4 - 20 mA or signal for digital communication.

Installation Orientation

epsisteem orient

Technical Data

  • Sizes : DN 50 - DN 400, 2" - 16", larger sizes on request
  • Pressure rating : up to PN 40, 300 lbs, higher pressure ratings on request
  • Temperature : Process : up to 400°C,
  • Mounting style : Between flanges according to DIN or ANSI standards
  • Flange facing : flat face (standard), raised face, DIN 2512 N, DIN 2513 R
  • Overall length : 32 mm
  • Material : Stainless steel AISI 316
  • Design and calculation standards : ISO 5167, ASME MFC-3M.
  • Drain hole : On request
  • β (d/D) : 0,5 and 0,6
  • Accuracy : +/- 1,2 %
  • Rangeability : 8:1
  • Repeatability : better than 0,1 %
  • Pressure loss : typical 150 mbar (values are given at full flow)
  • Reynolds No : Re > 5000
  • Allowable differential Pressure : max 2,5 bar
  • Output signal : analogue 4 - 20 mA or Digital communication via protocol, HART, PROFIBUS, Foundation Fieldbus or others.
  • Local indicator (option) : LCD showing flowing units or %
  • Power supply : 14 - 36 Vdc, typical 24 Vdc.
  • Max load (24 Vdc) : 700 Ohm
  • Enclosure : IP 67
  • Ex protection : intrinsically safe EEx ia IIC T6, Explosion proof EEx d IIC T6
  • Temperature : Ambient : -40 - +80°C


DIN Flanges

SizePipe ODPressure ratingInner pipe diameterBA1A2
DN 5060,3PN 4070,3127166289
DN 6576,1PN 4082,5142173296
DN 8088,9PN 40107,1162183306
DN 100114,3PN 16107,1168186309
DN 100114,3PN 40131,7192198321
DN 125139,7PN 16131,7194199322
DN 125139,7PN 40159,3218211334
DN 150168,3PN 16159,3224214337
DN 150168,3PN 40207,3273239362
DN 200219,1PN 16206,5284244367
DN 200219,1PN 25206,5290247370
DN 200219,1PN 40260,4329267390
DN 250273PN 16258,8340272395
DN 250273PN 25258,8352278401
DN 250273PN 40309,7378291414
DN 300323,9PN 10309,7384294417
DN 300323,9PN 16307,9400302425
DN 300323,9PN 25307,9417311434
DN 300323,9PN 40341,4438321435
DN 350355,6PN 10339,6444324447
DN 350355,6PN 16339,6457331454
DN 350355,6PN 25338,0474339462
DN 350355,6PN 40392,2489341464
DN 400406,4PN 10390,4495350473
DN 400406,4PN 16388,8514359482
DN 400406,4PN 25384,4546375498

ANSI Flanges

SizePipe ODPressureSch. 10S Inner pipe dia.Sch. 40 Inner pipe dia.Sch. 80 Inner pipe dia.BA1A2
2”60.3150 lbs54,752,549,3104,8154277
  300 lbs   111,1158281
3”88.9150 lbs82,877,973,7136,5170293
  300 lbs   149,1177300
4”114.3150 lbs108,2102,397,2174,6189312
  300 lbs   181,1193316
6”168.3150 lbs161,5154,1146,3222,3213336
  300 lbs   250,7227350
8”219.1150 lbs211,5202,7193,7279,4242365
  300 lbs   308256379
10”273150 lbs264,6254,5242,8339,7272395
  300 lbs   362283406
12”323.9150 lbs314,7303,2289,1409,6307430
  300 lbs   422,3313436
14”355.6150 lbs346333,3317,5450,9327450
  300 lbs   485,8345468
16” 150 lbs396,8381363,6514,4359482
  300 lbs   539,8372495

Overall Dimensions

epsisteem overall dims

Installation Requirements

The EPSI-STEEM flow meter can be mounted in a horizontal or vertical pipe. The condensing pot arrangement shall be mounted horizontally with the outlet pointing downwards. To insure high accuracy of measurement, long straight pipe runs up-stream from the flow meter is necessary. The required straight pipe run depends on the disturbance upstream. To maintain the 1,2% accuracy the minimum straight pipe run upstream shall be 14 x inner pipe diameter and 6 x downstream If an additional inaccuracy of 1⁄2 % is acceptable the required straight pipe runs are reduced to half of the above values. Mass flow Mass flow measurement of saturated steam is obtainable using EPSI-STEEM with a multi variable differential pressure transmitter. Mass flow measurement of super heated steam : ask for EPSI-STEEM-MAS mass flow meter data sheet.

Typical Applications

Mass flow metering of saturated and superheated steam, with mass flow, temperature and pressure variables transmitted on 4-20mA and HART.


DN 100 EPSISTEEM ES1 in stainless steel PN 40 with DIN 2526 facing, β value 0,6, with drain hole, for
horizontal right hand mounting and 3 valve double flanged manifold valve type G3H and without
transmitter has following code:
8" EPSISTEEM ES2 in stainless steel 150 lbs with RF facing, β value 0,5, without drain hole, with
Integrated manifold, for vertical mounting flow direction downwards has following code:


Works with:-

Differential pressure transmitters:-IDP10; IDP15; IDP25; IDP31; IDP50
And all our Absolute Pressure and Gauge Pressure transmitters, Temperature sensors and mass flow computers.
MultiVariable Transmitters :- IMV25, IMV30

Download Manual (Not Available)

If you require further information on this product or would like a quotation, please contact dp-flow on:

sales +44(0)1865 600245