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**