Siemens SIPART PS2 Series, SIPART PS2, SIPART PS2 PA, SIPART PS2 EEx-d, SIPART PS2 FF Technical Description

Electropneumatic positioners

© Siemens AG 2008

SIPART PS2

6/2 Product overview

6/3 SIPART PS2

6/3 Technical description
6/8 Technical specifications
6/8 - all versions
6/9 - SIPART PS2
6/11 - SIPART PS2 PA
6/13 - SIPART PS2 FF
6/15 - Option modules
6/18 Ordering data
6/18 - SIPART PS2, PS2 PA, PS2 FF
6/19 - SIPART PS2 EEx-d, PS2 EEx-d PA,

6/20 - Accessories
6/22 Dimensionsal drawings
6/23 Schematics
6/24 Mounting kits

Software

Sec. 9 SIMATIC PDM, for parameterize

HART and PROFIBUS P

PS2 EEx-d FF

A devices

You can download all instructions, cata­logs and certificates for SIPART PS2 free
of charge at the following Internet
address:

www.siemens.com/sipartps2

Siemens FI 01 · 2009

Electropneumatic positioners

6

© Siemens AG 2008

Product overview

■

Overview

Electropneumatic positioners SIPART PS2

Application Device description Catalog

Position control
Pneumatic linear or part­turn actuators, also for
intrinsically-safe opera­tion

As above, but in flame­proof casing for explo­sion-proof application

SIPART PS2

Universal device for positioning pneumatic actuators

• Connection: 4 to 20 mA

• HART, PROFIBUS PA or Foundation Fieldbus

• Local manual operation

• Binary inputs and outputs

• Diagnosis functions

• Blocking function

• Automatic startup

SIPART PS2

As above, but in flameproof aluminium
casing

page

6/3 SIMATIC PDM

6/3 SIMATIC PDM

Software for
parameterization

6/2

Siemens FI 01 · 2009

■

© Siemens AG 2008

Overview

SIPART PS2 electropneumatic positioner

Electropneumatic positioners

SIPART PS2

Technical description

■

Benefits

SIPART PS2 positioners offer decisive advantages:

• Simple installation and automatic commissioning (self-adjust­ment of zero and span)

• Simple operation with

- Local operation and configuration of the device using three

input keys and a user-friendly two-line LCD

- Programming through SIMATIC PDM

• Very high-quality control thanks to an online adaptation proce­dure

• Negligible air consumption in stationary operation

• "Tight shut-off" function (ensures maximum positioning pres­sure on the valve seat)

• Numerous functions can be activated by simple configuring
(e.g. characteristics and limits)

• Extensive diagnosis functions for valve and actuator

• Only one device version for linear and part-turn actuators

• Few moving parts, hence insensitive to vibrations

• External non-contacting position sensor as option for extreme
ambient conditions

• "Intelligent solenoid valve": Partial Stroke Test and solenoid
valve function in a single device

• Partial Stroke Test e.g. for safety valves

• SIL (Safety Integrity Level) 2

• Can also be operated with natural gas

SIPART PS2 EEx d electropneumatic positioner in flameproof casing

SIPART PS2 in stainless steel casing

The SIPART PS2 electropneumatic positioner is used to control
the final control element of pneumatic linear or part-turn actua­tors. The electropneumatic positioner moves the actuator to a
valve position corresponding to the setpoint. Additional function
inputs can be used to block the valve or to set a safety position.
A binary input is present as standard in the basic device for this
purpose.

■

Application

The SIPART PS2 positioner is used, for example, in the following
industries:

• Chemical/petrochemical

• Power stations

• Paper and glass

• Water, waste water

• Food and pharmaceuticals

• Offshore plants

The SIPART PS2 positioner is available:

• For single-action actuators: in plastic, stainless steel or alumi­num casings, as well as flameproof aluminium casing (EEx d)

• For double-action actuators: in plastic and stainless steel cas­ing, as well as flameproof aluminum casing (EEx d)

• For non-hazardous applications

• For hazardous applications in the designs

- as intrinsically-safe device (EEx ia/ib) or

- in flameproof aluminum casing (EEx d) or

- in EEx n design (non sparking)

and in the versions:

• 0/4 to 20 mA control communication without/with communica­tion through HART signal

• With PROFIBUS PA communication interface

• With FOUNDATION Fieldbus (FF) communications interface.

Explosion-proof versions

The basic version of the device is available in an intrinsically­safe design with degr
with approval for zone 2/zone 22 (dust).

Operation in zone 1 is permitted when enclosed in the flame­proof casing version SIPART PS2 EEx d. (see "Technical Data").
It is then permissible to use all option modules (except external
actuator travel detection systems, SIA module, limit value con­tact module and NCS).

otection EEx ia/ib or in a design

ee of pr

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Electropneumatic positioners

© Siemens AG 2008

SIPART PS2

Technical description

6

Stainless steel casing for extreme ambient conditions

The SIPART PS2 is available in a stainless steel casing (without
window in the lid) for use in particularly aggr
(e.g. offshore operation, chlorine plants etc.). The device func­tions are the same as those of the basic versions.

■

Design

The SIPART PS2 positioner is a digital field device with a highly­integrated microcontroller.

The positioner consists of the following components:

• Casing and cover

• PCB with corresponding electronics with or without communi­cation through HART
or with electronics for communication in accordance with

- PROFIBUS PA specification, IEC 61158-2; bus-supplied de-

vice, or

- FOUNDATION Fieldbus (FF) specification, IEC 61158-2,

bus-supplied device

• Actuator travel detection system

• Terminal housing with screw terminals

• Pneumatic valve manifold with piezoelectric valve precontrol.

The valve manifold is located in the housing, the pneumatic con­nections for the inlet air and the positioning pressure on the right­hand side. A pressure gauge block and/or a safety solenoid
valve can be connected there as options. The SIPART PS2 posi­tioner is fitted to the linear or part-turn actuator using an appro­priate mounting assembly. The circuit board container in the
casing provides slots for separately ordered boards with the
following functions:

module:

I

y

• Position feedback as a two-wire signal 4 to 20 mA.

Alarm module (3 outputs, 1 input):

• Signaling of two limits of the travel or angle by binary signals.
The two limits can be set independently as maximum or mini­mum values.

O

utput of an alarm if the setpoint position of the final control

•
element is not reached in automatic mode or if a device/fitting
fault occurs.

• Second binary input for alarm signals of for triggering safety
reactions e. g. for blocking function or safety position.

Limit signaling through slot-type initiators (SIA module)

Two limits can be signaled redundantly as NAMUR signals
(EN 60947-5-6) by slot-type initiators. The module also contains

m output (see Alarm module).

an alar

Limit value signal via mechanical contacts (Limit value con­tact module)

Two limits can be signaled redundantly by switching contacts. A
fault message output is also integrated in the module (see alarm
module).

alid for all modules described above:

V
All signals are electrically isolated from one another and from the

basic unit. The outputs indicate self-signaling faults. The mod­ules are easy to retrofit.

Separate mounting of actuator travel detection system and

oller unit

contr

The actuator travel detection system and contr
connected separately for all casing versions of the SIPAR
(except flameproof design). Measurement of the travel or angle
is carried out directly on the actuator. The controller unit can then
be fitted a certain distance away, e.g. on a mounting pipe or sim­ilar, and is connected to the travel detection system by an elec­tric cable and to the actuator by one or two pneumatic lines.
Such a split design is frequently advantageous if the ambient

essive environments

oller unit can be

T PS2

conditions at the fitting exceed the specified values for the posi­tioner (e.g. strong vibrations).

The following can be used for measuring the travel or angle:

• NCS sensor

• External position detection system C73451-A430-D78

• A commercially available potentiometer (10 kΩ resistance)
(e.g. for higher application temperatures or customer-specific
applications)

The use of linear potentiometers is recommended for very small ac­tuators with a short valve travel since, on the one hand, the space
required by the linear potentiometer is very small and, on the other,
the transmission characteristic is optimum for a small travel.

Separate connection of actuator travel detection system and controller unit

Separate connection of actuator travel detection system and controller unit

Non-contacting position sensor (NCS)

Contact and non-contacting positioning sensor (NCS) for part-turn actu­ator (left) and for linear actuator 14 mm (0.55 inch) (right)

NCS for travels >14 mm (0.55 inch)

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Electropneumatic positioners

© Siemens AG 2008

SIPART PS2

Technical description

The NCS sensor consists of a non-contacting position sensor. All
coupling elements are omitted such as coupling wheel and
driver pin with part-turn actuators or lever and pick-up bracket
with linear actuators up to 14 mm travel.

This results in:

• Even greater resistance to vibration and shock

• No wear of sensor

• Problem-free mounting on very small actuators

• Negligible hysteresis with very small travels.

The sensor does not require an additional power supply, i.e.
SIPART PS2 (not for EEx d version) can be operated in a 2-wire
system. The NCS (N
potted sensor housing which must be mounted permanently and
a magnet which is mounted on the spindle of linear actuators or
on the shaft butt of part-turn actuators. For the version for travels
>14 mm (0.55 inch), the magnet and the NCS are premounted
on a stainless steel frame and offer the same interface mechan­ically as the positioner itself, i.e. they can be mounted using the
standard mounting kits 6DR4004-8V, -8VK and -8VL.

The installation of a EMC filter module in the positioner (controller
unit) is necessary in order to ensure a connection level with EMC
according to EN 61326/A1 and NAMUR NE21 when using exter­nal sensors (see Ordering data for "EMC filter module")

■

Function

The SIPART PS2 electropneumatic positioner works in a com­pletely different way to normal positioners.

Mode of operation

Comparison of the setpoint and the actual value takes place

onically in a micr

electr
deviation, it uses a 5-way switch procedure to control the piezo­electric valves, which regulates the flow of air into and from the
chambers of the pneumatic actuator or blows it in the opposite
direction.

The microcontroller then outputs an electric control command to
the piezoelectric valve in accordance with the size and direction
of the deviation (deviation between setpoint w and control
output x). The piezoelectric valve converts the command into a
pneumatic positional increment.

The positioner outputs a continuous signal in the area where
there is a large control deviation (high-speed zone); in areas of
moderate control deviation (slow-speed zone) it outputs a se­quence of pulses. No positioning signals are output in the case
of a small control deviation (adaptive or variable dead zone).

The linear or rotary motion of the actuator is detected by the
mounting assembly and transferred to a high-quality potentio­meter made of plastic conductive material over a shaft and a
non-floating gear transmission.

The angular error of the pick-up in cases where the assembly is
mounted on a linear actuator is corrected automatically.

When connected in a 2-wire system, the SIPART PS2 draws its
power exclusively from the 4 to 20 mA setpoint signal. The elec­tric power is also connected through the 2-wire bus signal with
PROFIBUS operation (SIPART PS2 PA). The same applies for the
FOUNDATION Fieldbus version.

Pneumatic valve manifold with piezoelectric valve precontrol

The piezoelectric valve can release very short control pulses.
This helps achieve a high positioning accuracy
ment is a piezoelectric bending conver
pneumatic main control unit. The valve manifold is characterized
by an extremely long service life.

Local operation

Local operation is performed using the built-in LCD and the

ee input keys. Switching between the operating levels Auto-

thr
matic, Manual, Configuring and Diagnosis is possible at the

ess of a button.

pr

on Contacting Position Sensor) consists of a

ocontroller. If the microcontroller detects a

. The pilot ele-

ter which switches the

In Manual mode the drive can be adjusted over the entire range
without interrupting the circuit.

Operation and monitoring with the SIMATIC PDM communi­cations pr

The SIMA
through the HAR
pling.

The SIMATIC PDM communications software permits easy re­mote operation and monitoring using a PC or laptop. The posi­tioner can also be configured using this program. Parameters
which provide important information for maintenance and fault
diagnosis of the complete unit can also be determined using
process data and comparison data.

When operating the SIPART PS2 through the HART interface, the
connection is made directly to the 2-wire cable to the
SIPART PS2 positioner through a HART modem that can be con­nected to the RS 232 or USB interface. The signals needed for
communication in conformity with the HART protocol are super­imposed on the current signal in accordance with the F

hift Keying (FSK) method.

S

Automatic commissioning

With a simple configuration menu the SIPART PS2 can be quickly
adapted to the fitting and adjusted by means of an automatic
star

During initialization, the micr
point, full-scale value, the direction of action and the positioning
speed of the fitting. From this data it establishes the minimum
pulse time and the dead zone, thus optimizing the control.

Low air consumption

A hallmark of the SIPART PS2 is its own extremely low consump­tion of air. Nor
costly. Thanks to the use of modern piezoelectric technology, the
SIPART PS2 consumes air only when it is needed, which means
that it pays for itself within a very short time

Comprehensive monitoring functions

The SIPART PS2 has various monitoring functions with which
changes on the actuator and valve can be detected and sig­naled if applicable when a sele
This infor
or valve. The measured values to be determined and monitored,
some of whose limits can be adjusted, include:

• Travel integral

• Number of changes in direction

• Alarm counter

• Self-adjusting dead zone

• Valve end limit position (e.g. for detection of valve seat wear
or deposits)

• Operating hours (also according to temperature and position­ing ranges) as well as min./max. temperature

• Operating cycles of piezoelectric valves

• Valve positioning time

• Actuator leakages

ogram

TIC PDM program is available for communication

T interface and also for the PROFIBUS PA cou-

requency

tup function.

ocontroller determines the zero

mal air losses on conventional positioners are very

ctable limit has been exceeded.

mation may be important for diagnosis of the actuator

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Electropneumatic positioners

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SIPART PS2

Technical description

Status monitoring with 3-stage alarm concept

The intelligent electropneumatic SIPART PS2 positioner is
equipped with additional monitoring functions. The status indi­cations derived fr
faults of the unit. The severity of these faults ar
"traffic light signaling", symbolized by a wrench in the colors
green, yellow and red (with SIMATIC PDM and Maintenance Sta­tion):

• Need for maintenance (green wrench)

• Urgent need for maintenance (yellow wrench)

• Imminent danger of unit failure or general failure (red wrench)

This allows users to put early measures into action in the run-up
to a serious valve or actuator fault, which can prevent an immi­nent system shutdown. The fact that a fault indication is sig­naled, such as the onset of a diaphragm break in the actuator or
the progressive sluggishness of a unit, enables the user to en­sure system reliability at any time by means of suitable mainte­nance strategies.

This three-stage alarm hierarchy also allows early detection and
signaling of other faults, such as the static friction of a packing
box, the wearing of a valve plug/seating, or precipitations or in­crustations on the fittings.

These fault indications can be output either line-conducted over
the alarm outputs (see above) of the positioner (max. 3), or via
communication over the HART or fieldbus interfaces. In this
case, the HART, PROFIBUS and FF versions of SIPART PS2 per­mit a differentiation of the various fault indications, as well as a
trend representation and histogram function of all key process
variables with regard to the fittings.

The LCD of the device also displays the graded maintenance re­quirements, complete with identification of the source of the fault.

Functional safety acc. to SIL 2

The SIPART PS2 positioners are also suitable for control of fit­tings, which meet the special r
safety up to SIL 2 to IEC 61508 or IEC 61511-1.

This is a single-action, venting positioner with an input of 4 to
20 mA, PROFIBUS PA and FOUNDATION Fieldbus (FF) for
mounting on pneumatic actuators with spring return.

The positioner vents the valve actuator on demand or in the
event of a fault and puts the valve in the preset safety position.

This positioner meets the following requirements:

• Functional safety up to SIL 2 to IEC 61508 or IEC 61511-1,
from firmware version C4 or higher for safe venting

• Explosion protection for the versions 6DR5...-.E...

• Electromagnetic compatibility to EN 61326/A1, Appendix A.1

SIPART PS 2 as "intelligent solenoid valve"

Open / Close valves, safety fittings in particular, are generally
pneumatically contr

ART PS2 instead of this type of solenoid valve, the positioner

P
performs two tasks in a single device (without extra wiring)

• Firstly, it switches the fitting off on demand by venting the ac­tuator (functional safety acc. to SIL 2 (see above)

• Secondly, it can perform a Partial Stroke Test at regular inter­vals (1 - 365 days), which prevents the blocking of the fitting,
e.g. due to corrosion or furring.

As in this case SIPART PS2 is constantly working in normal op­eration (e.g. 99 % position), it also acts as a permanent test func­tion for the pneumatic output circuit, which is not usually possi­ble when using a solenoid valve.

Solenoid valves on control valves can also not normally be
tested during operation. They are therefore not necessary when
using SIPART PS 2 with a 4-wire connection system as the vent­ing is carried out on demand by SIPART PS2. This means that on
control valves, both the control function and the shut-off function
can be carried out by a single device.

om these monitoring functions signal active

ements of the functional

equir

olled over a solenoid valve. If you use SI-

e graded using

Configuring

The following settings, for example, can be configured in config­uring mode as r

• Input current range 0 to 20 mA or 4 to 20 mA

• Rising or falling characteristic at the setpoint input

• Positioning speed limit (setpoint ramp)

• Split-range operation; adjustable start-of-scale and full-scale
values

• Response threshold (dead zone); self-adjusting or fixed

• Direction of action; rising or falling output pressure with rising
setpoint

• Limits (start-of-scale and full-scale values) of positioning
range

• Limits (alarms) of the final control element position; minimum
and maximum values

• Automatic "tight shut-off" (with adjustable response threshold)

• The travel can be corrected in accordance with the valve char­acteristic.

• Function of binary inputs

• Function of alarm output etc.

The key aspects of configuring the different SIPART PS2 ver­sions are largely identical.

ed with the SIPART PS2 positioner:

equir

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Electropneumatic positioners

A

D

A

D

1

BE1

I

W+

I

W-

W

y

0

x

0

+

_

W

x

+U

BE2

A1 A2

6

+5 V

+24 V

2

_

y

+

y

U

U

I

5

4

3

p

Z

p

2

p

1

8

9

p

2

p

1

p

1

_

+

p

2

p

1

A1 A2

7

II

1 Motherboard with microcontroller and input circuit
2 Control panel with LCD and pushbuttons
3 Piezoelectric valve unit, always present
4 Valve unit, present as accessory in double-action positioner
5 Iy module for SIPART PS2 controller
6 Alarm module for 3 alarm outputs and one binay input

Travel

Travel

Exhaust

Exhaust

Inlet air

HART

Micro-

controller

7 SIA module (slot initiator alarm module, fig.) or limit value contact module
8 Spring loaded pneumatic actuator (single-action)
9 Springless pneumatic actuator (double-action)

Note:

Alarm module (6) and SIA module (7) can only be inserted as alternatives.

© Siemens AG 2008

SIPART PS2

Technical description

SIPART PS2, electropneumatic positioner, function diagram

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Electropneumatic positioners

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© Siemens AG 2008

SIPART PS2

Technical specifications
all versions

■

Technical specifications

SIPART PS2 (all versions)

General data

Travel range (linear actuators) 3 ... 130 mm (0.12 ... 5.12 inch)

Angle of rotation
(part-turn actuators)

Installation

• On linear actuators Using attachment set

• On part-turn actuators Using attachment set

Controller

• Five-point switch Self-adjusting

• Dead zone

- dEbA = Auto Self-adjusting or can be set as

- dEbA = 0.1 ... 10% Self-adjusting or can be set as

A/D converter

• Scan time 10 ms

• Resolution ≤ 0.05%

• Transmission error ≤ 0.2%

• Temperature effect ≤ 0.1%/10 K (≤ 0.1%/18 °F)

Cycle time

• 20 mA/HART device 20 ms

• PA device 60 ms

• FF device 60 ms (min. loop time)

Binary input BE1 (terminals 9/10;
electrically connected to the basic
device)

Degree of protection IP66 to EN 60 529/NEMA 4x

CE marking Conformity as regards EMC Direc-

EMC requirements EN 61326/A1 Appendix A.1 and

Material

• Housing

- 6DR5..0-... (plastic) Glass-fiber-reinforced Macrolon

- 6DR5..1-... (metal) GD AISi12

- 6DR5..2-... (stainless steel) Austenitic stainless steel mat.

- 6DR5..5-... (metal, pressure­proof)

• Pressure gauge block Aluminium AIMgSi, anodized

Vibration resistance

• Harmonic oscillations
(sine-wave) according to
DIN EN 60062-2-6/05.96

• Bumping (half-sine)
to DIN EN 60068-2-29/03.95

(angle of feedback shaft 16 ... 90°)

30 ... 100°

6DR4004-8V and where necessary
with an additional lever arm
6DR4004-8L on actuators accord­ing to IEC 534-6 (NAMUR) with
ribs, bars or flat face

6DR4004-8D on actuators with
mounting plane according to
VDI/VDE 3845 and DIN 3337:
The required mounting console
has to be provided on the actuator
side; shaft with groove and female
thread M6

fixed value

fixed value

Suitable only for floating contact;
max. contact load < 5 mA with 3 V

tive 89/336 EC in accordance with
the following standards

NAMUR NE21 August 98

No. 1.4581

GK AISi12

3.5 mm (0.14 inch), 2 ... 27 Hz
3 cycles/axis

98.1 m/s² (321.84 ft/s²),
27 ... 300 Hz, 3 cycles/axis

150 m/s² (492 ft/s²), 6 ms,
1000 shocks/axis

• Noise (digitally controlled)
to DIN EN 60068-2-64/08.95

• Recommended continuous duty
range of the complete fitting

Weight, basic device

• Plastic casing Approx. 0.9 kg (1.98 lb)

• Metal casing, aluminium Approx. 1.3 kg (2.86 lb)

• Metal casing, stainless steel Approx. 3.9 kg (8.58 lb)

• Metal casing EEx d version Approx. 5.2 kg (11.46 lb)

Dimensions See "Dimensional drawings"

Climate class 4 To DIN EN 60721-3-4

• Storage

•Transport

• Operation

Certificate and approvals

Classification according to pres­sure equipment
directive (DRGL 97/23/EC)

Pneumatic data

Power supply Compressed air, nitrogen or

• Pressure 1.4 ... 7 bar (20.3 ... 101.5 psi):

Air quality to ISO 8573-1

• Solid particle size and density Class 2

• Pressure dew point Class 2 (min. 20 K (36 °F) below

• Oil content Class 2

Unthrottled flow

• Inlet air valve

• Outlet air valve

Valve leakage < 6⋅10

Throttle ratio Adjustable up to ∞ : 1

Power consumption in the
controlled state

Types of actuators

• In casing Single-action and double-action

• In aluminium casing Single-action

• In flameproof casing Single-action and double-action

• In stainless steel casing Single-action and double-action

1)

2)

3)

4)

1)

1)

2)

(ventilate actuator)

- 2 bar (29 psi) 4.1 Nm³/h (18.1 USgpm)

- 4 bar (58 psi) 7.1 Nm³/h (31.3 USgpm)

- 6 bar (87 psi) 9.8 Nm³/h (43.1 USgpm)

(exhaust actuator)

- 2 bar (29 psi) 8.2 Nm³/h (36.1 USgpm)

- 4 bar (58 psi) 13.7 Nm³/h (60.3 USgpm)

- 6 bar (87 psi) 19.2 Nm³/h (84.5 USgpm)

During commissioning at ≤ 0 °C (≤ 32 °F) make sure that the valves are
flushed long enough with the dry medium.

At ≤ -10 °C (14 °F) the display refresh rate of the LCD is limited. Only T4 is
permissible when using I

-25 ... +75 °C (-13 ... +167 °F) for 6DR55..-0G..., 6DR56..-0G...,
6DR55..-0D... and 6DR56..-0D...

With EEx d version (6DR5..5-...) the values are reduced by approx. 20%.

4)

4)

module.

y

10 ... 200 Hz; 1 (m/s²)²/Hz
(3.28 (ft/s²)²/Hz)

200 ... 500 Hz; 0.3 (m/s²)²/Hz
(0.98 (ft/s²)²/Hz)

4 hours/axis

≤ 30 m/s² (≤ 98.4 ft/s²) without res­onance sharpness

1K5, but -40 ... +80 °C
(1K5, but -40 ... +176 °F)

2K4, but -40 ... +80 °C
(2K4, but -40 ... +176 °F)

4K3, but -30 ... +80 °C
(4K3, but -22 ... +176 °F)

For gases of fluid group 1, com­plies with requirements of article 3,
paragraph 3 (sound engineering
practice SEP)

cleaned natural gas

Sufficiently greater than max. drive
pressure (actuating pressure)

ambient temperature)

-4

Nm³/h (0.0026 USgpm)

-2

< 3.6⋅10

Nm³/h (0.158 USgpm)

3)

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