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 17 to 1.030 l/h at uniform operation conception, 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 dosing tasks.

Advantages

Process safety: In case of average, dosing 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 dosing accuracy better than ±2 %.
Easy handling: direct adjustment and control of dosing 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 dosing for pH neutralization in waste water treatment
Time-controlled chemical addition in cooling water circuits.
Pulse-controlled dosing when bottling different volumina, e.g. glycerine filling of manometres.

Features

Capacity range 50 - 420 l/h, 12 - 4 bar
High-strength inner housing for energy-stressed components as well as additional polymer housing as protection against corrosion.
Stroke length: 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 dosing medium may not escape uncontrollably from the pump or get into the gear area of the pump.
Liquid end materials: PVDF, stainless steel 1.4571/ 1.4404
Reproducible dosing 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 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	bar	l/h	strokes/min.	psi	l/h / gph	strokes//min.	suction lift mWS	connector dimensions G - DN
16050	10/16*	50	73	145	60 / 15,9	87	7	1 - 15
16090	10/16*	90	132	145	108 / 28,5	156	7	1 - 15
16130	10/16*	130	198	145	156 / 41	232	7	1 - 15
07120	7	120	73	100	144 / 38	87	5	20^**
07220	7	220	132	100	264 / 69,7	156	5	20^**
04350	4	350	198	58	420 / 111	232	5	20^**

* Please note: Maximum operation of 10 bar for material version PVT

**Please note: Sigma types 07120, 07220, 04350 liquid ends are fitted with DN 25 (G 1 1/2) vales. Since 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 DN 20, i.e. customers can order standard 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 1.4571 / 1.4404	Stainless Steel 1.4581	PTFE	Stainless Steel 1.4404	Stainless Steel /FPM**