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Sigma/ 2 Diaphragm Metering Pump

Sigma/ 2 Diaphragm Metering Pump

Together with Sigma/ 1 and Sigma/ 3, Sigma/ 2 Motor Diaphragm Metering Pumps compose a continouos product line, covering the capacity ranges from 4.5 to 272 gph (17 - 1,030 L/h) at uniform operation, control conception and spare parts management. All three pumps are available as Basic types with no internal electronic control systems or as microprocessor versions for rapid and reliable adjustment to fluctuating metering tasks.

Advantages

  • Process safety: In case of failure, metering medium does not escape to the environment or into the pump gear, thanks to double diaphragm with diaphragm failure indication.
  • Reliable operation thanks to automatic bleeding.
  • Protection of the pump against overload with integrated relief valve.
  • High process quality: reproducible metering accuracy better than ±2 %.
  • Easy handling: direct adjustment and control of metering capacity in plain language via the big illuminated LC display (Control version)
  • Problem-free connection to complex process control systems with optional equipment with PROFIBUS®-DP interface (Control version)
  • Simplified spare parts management and decreased stock handling efforts at same availability of pumps within the Sigma product line.
  • Less training efforts for operating staff when handling the Sigma product line, thanks to same operation modus.

Application Areas

  • Quantity-proportional chemical addition in water treatment, e.g. Sodium Hypochlorite for drinking water disinfection.
  • Measurement-dependent chemical addition, e.g. acid and brine metering for pH neutralization in waste water treatment
  • Time-controlled chemical addition in cooling water circuits.
  • Pulse-controlled metering when bottling different volumina, e.g. glycerine filling of manometers.

Features

  • Capacity range 13.2 - 111 gph (50 - 420 L/h), 174 - 58 psig (12 - 4 bar)
  • High-strength inner housing for energy-stressed components as well as additional polymer housing as protection against corrosion.
  • Stroke length: 0.19" (5 mm), adjustable via self-arresting adjusting knob in 0.5 % steps.
  • Double diaphragm with diaphragm failure indication (optionally, also retrofittable), i.e. even with diaphragm failure the metering medium may not escape uncontrollably from the pump or get into the gear area of the pump.
  • Liquid end materials: PVDF, stainless steel
  • Reproducible metering accuracy at defined conditions and correct installation better than ±2 % (stroke length area 30 - 100 %)
  • Integrated hydraulic relief valve: protection of pump against overload without complex extra-installations and costs as well as problem-free bleeding of metering pump during suction process.
  • For high pressure rates a plunger version for up to 4,641 psig (320 bar) is available

Features Basic type (S2Ba)

  • Broad selection of drive versions: three-phase norm motor, single-phase alternating current motor, motors for the use in EXe and EXde areas, various flange versions for the use of customer-specific motors.
  • Protection class IP 55 (optionally ATEX-T3/T4)
  • Stroke-length adjustment: manually (optionally with stroke positioning drive or with stroke control drive)

Features Control Version (S2Ca)

  • Microprocessor control: optimum combination of variable AC frequency combined with digital stroking frequency, ensures exact metering even in the lower minimum range due to individual stroke control.
  • The individual pump functions are simply adjusted using the five programming keys.
  • Big backlit LCD
  • Indication in plain language of metering capacity in L/h or US-gal/h
  • 3-LED-function as operation indicator, alarm indicator and fault indicator.
  • Control via contact or analogue signals (e.g. 0/4-20 mA)
  • On demand, integration of 2-week-process timer. The intelligent alternative to clock timers.
  • Protection class IP 65 
  • Interface for PROFIBUS®-DP

Technical Data

 

ati 50 Hz

 at 60 Hz

 

Pump type
Sigma/ 2  HM

 psig

bar

 gph

L/h

strokes/

min.

 psig

bar

gph 

L/h

strokes/

min.

suction lift mWS

connector dimensions

G - DN

16050

 145/232

10/16*

13.2

 50

 73

 145

10

 15.9

60

 87

 7

 3/4"(1 - 15)

16090

 145/232

10/16*

23.7

 90

 132

 145

10

 28.5

108

 156

 7

 3/4"(1 - 15)

16130

 145/232

 10/16*

34.3

 130

 198

 145

10

 41

156

 232

 7

 3/4" (1 - 15)

07120

 102

7

31.7

 120

 73

 100

7

 38

 144

 87

 5

  3/4" (DN 20)**

07220

 102

7

58.1

 220

 132

 100

7

 69.7

264

 156

 5

 3/4" (DN 20)**

04350

 58 

4

92.5

 350

 198

 58

4

 111

420

 232

 5

 3/4" (DN 20)**

* Please note: Maximum operation of 145 psig (10 bar) for material version PVT

**Please note: Sigma types 07120, 07220, 04350 liquid ends are fitted with DN 25 (G 1") vales. Since 3/4" (DN 20) is normally large enough for these versions (see technical data, connector suction/discharge line), the connector parts identified in the identity code (e.g. inserts) are already reduced to 3/4" (DN 20), i.e. customers can order standard 3/4" (DN 20) pipe and accessories. For the S2Ca pump types the 60 capacity data (since internal 60 Hz operation applies, however, max. 200 strokes/min.

Materials in Contact with Chemicals at Liquid End Version

Material

Liquid End

Suction/Discharge Connector

Seals

Balls

Integrated Pressure Relief Valve

PVT

PVDF
(Polyvinylidene-
fluoride)

 PVDF
(Polyvinylidene-
fluoride)

 PTFE

Ceramic/Glass*

 PVDF/FPM**

 SST

Stainless Steel

Stainless Steel 

 PTFE

 Stainless Steel 

 Stainless Steel /FPM**

* at 07120, 07220, 04350. **FPM Viton: (Fluoric caoutchouc)