Schmidt SS 20.415 Twin User manual

SCHMIDT®Flow Sensor

SS 20.415 Twin

Instructions for Use

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 2

SCHMIDT®Flow Sensor

SS 20.415 Twin

Table of Contents

1Important information.......................................................................3

2Application range.............................................................................4

3Mounting instructions.......................................................................5

4Electrical connection........................................................................7

5Signalizing .....................................................................................10

6Startup...........................................................................................11

7Information concerning operation..................................................11

8Service information........................................................................12

9Technical data ...............................................................................14

10 Declarations of conformity.............................................................15

Imprint:

Version: 568106.02

Subject to modifications

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 3

1 Important information

These instructions for use contain all required information for a fast com-

missioning and a safe operation of SCHMIDT®flow sensors of the model

SS 20.415 Twin.

These instructions for use must be read completely and observed care-

fully, before putting the unit into operation.

Any claims under the manufacturer's liability for damage resulting from

non-observance or non-compliance with these instructions will become

void.

Tampering with the device in any way whatsoever - with the exception

of the designated use and the operations described in these instruc-

tions for use - will forfeit any warranty and exclude any liability.

The unit is designed exclusively for the use described below (see chap-

ter 2). In particular, it is not designed for direct or indirect protection of

personal and machinery.

SCHMIDT Technology cannot give any warranty as to its suitability for

a certain purpose and cannot be held liable for errors contained in

these instructions for use or for accidental or sequential damage in

connection with the delivery, performance or use of this unit.

Symbols used in this manual

The symbols used in this manual are explained in the following section.

Danger warnings and safety instructions - please read them!

Non-observance of these instructions may lead to personal injury

or malfunction of the device.

General note

All dimensions are given in mm.

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 4

2 Application range

The SCHMIDT®Flow Sensor SS 20.415 Twin (566950) is designed for

stationary use in cleanrooms under atmospheric pressure conditions and

clean environmental conditions.

The sensor consists of two independent, spatially closely

positioned sen-

sor heads. Both of them are measuring the flow velocity of the measured

medium as standard velocity

wN(unit: m/s) relative to standard conditions

of 1,013.25 hPa and 20 °C. The respective output signals are linear and

independent of pressure and temperature of the medium. The decisive

characteristics of the product are listed below:

Measuring task

oRedundant measurement of flow velocity at one spot of the laminar

flow field.

oOutput of the measured values via two independent analog signals.

Application examples

oSimultaneous control and monitoring of laminar flow in cleanrooms.

Special operating notes

Only suitable for the use in clean gases.

The medium to be measured must not contain oils, residue form-

ing substances or abrasive particles.

Correct measurements require a laminar3flow with as low turbu-

lence as possible.

When transporting the sensor or when carrying out not approved

cleaning measures, always place the protective cap on the sen-

sor.

The SCHMIDT®Flow Sensor SS 20.415 Twin is designed for

applications inside closed rooms and is not suitable for outdoor

use.

Note:

The positions "A" respective "B" are assigned to both probes (see Figure

1) in order to be able to clearly assign their output signals (wNA resp. wNB;

see also Figure 2 and Table 2).

Aerodynamic cross influences are eliminated by the common adjustment.

Corresponds to the real velocity under standard conditions.

The term “laminar” means here an air flow low in turbulence (not according to its physical

definition saying that the Reynolds number is < 2300).

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 5

3 Mounting instructions

The following five mounting options are available for installtion:

Type 1

For mounting in

ceilings or frames

with wall thickness

from 1 … 22 mm.

Opening Ø 26 mm

necessary (mount-

ing with counter

nut) or a thread

M25 x 1.5 in ceiling

frame.

Type 2

For mounting in

ceiling frames with

existing opening

with PG21 winding

(e.g. sprinkler

opening in ceiling

frames).

Type 3

For mounting in

ceiling frames with

thickness of 21 …

40 mm, especially

for ceiling frames

out of hollow pro-

files.

Openings required

with Ø 26 mm and

Ø 28.5 mm.

Type 4

For welding in

stainless steel

ceilings.

Type 5

For mounting under

a ceiling or at a wall

with two screws M6.

Opening of Ø 15 mm

for cable necessary

and 2 threads M6.

Pressure-tight up to

300 mbar.

Table 1

Mounting sequence

If not yet in place, first drill a bore into the wall or ceiling for installing the

mounting bush. Then the mounting bush is fastened in the wall or ceiling.

Feed connecting cable from cleanroom side through the mounting bush

(open cable ends at first) until the cable jack protrudes by about 5 cm out

of the receptable. There must be enough room behind the mounting bush,

to allow the cable to be pushed backward when screwing in the sensor.

Then connect sensor with connection cable (plug in cable connector and

screw on sleeve nut), insert sensor into mounting bush and tighten mount-

ing screw by hand. Now the sensor can still be aligned accurately by hand,

if required. Finally, the holding fixture screw must be tightened with a key

wrench (wrench size 22) until the sensor is sufficiently secured against

twisting (hold sensor, if necessary).

Prior to commissioning the sensor, remove the protective caps.

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 6

Mounting beneath a ceiling

The angled sensor has been designed for mounting beneath a ceiling.

After screwing the sensor into the ceiling sleeve, its tip is automatically in

the correct position to measure the vertical downdraft flow beneath the

filter outlet. Only the torsional angle of the sensor arm (parallel to ceiling)

has to be aligned. Then tighten the assembly screw using the key wrench

until the sensor is secured against twisting (SW22; hold sensor, if neces-

sary).

Mounting at a wall

The straight sensor has been designed for installation at a wall.

After screwing the sensor into the receptable (tighten by hand), aligned it

as follows:

First, the sensor must be positioned in the flow field so that its measuring

direction corresponds to the flow direction. For this, the arrow engraved

on the housing’s surface (see Figure 1) must point approximately in the

direction of the air flow. For finer adjustment align the housing line visible

on the front of the sensor tip in parallel to the flow direction as precisely

as possible (e.g. in case of a vertical downdraft the sensor arrow has to

point downward to the floor and the housing line is also vertically).

Figure 1

The angular deviation should not be greater than 3° referenced

to the ideal direction of the gaseous flow. Otherwise measure-

ment accuracy may be affected (deviation > 1 %).

Finally, fully fasten the assembly screw using the fork wrench (SW22; hold

sensor, if necessary) to prevent the sensor from unintentional rotating.

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 7

4 Electrical connection

Plug-in connector

The SCHMIDT®Flow Sensor SS 20.415 Twin is equipped with a plug-in

connector which is firmly integrated in the probe. The connector has the

following data:

Number of connection pins: 7 (plus shield connection on the metallic enclosure)

Type: Male

Fixation of connecting cable: Screw M9 (on cable)

Model: Binder, series 712

Pin numbering:

View on plug-in connector of sensor

Figure 2

Pin assignment

The pin assignment of the plug-in connector can be found in Table 2.

Designation

Function

Wire color

Power

Operating voltage : +UB

White

RS485 A

Do not connect4

Brown

RS485 B

Do not connect

Green

Aout Flow B

Probe B: Velocity signal wNB

Yellow

RS_Select

Do not connect

Grey

Aout Flow A

Probe A: Velocity signal wNA

Pink

GND

Operating voltage : Mass

Blue

Shield

Electromechanical shielding

Shield meshwork

Table 2

All signals use GND as electrical reference potential.

The wire colours mentioned in Table 2 are applicable for the use of a cable

delivered by SCHMIDT®(article numbers: 505911-4, 535279, 535281,

561972, 561973, 565072).

Manufacturer use only - risk of destruction in case of incorrect connection

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 8

Electrical assembly

During electrical installation ensure that no voltage is applied and

inadvertent activation is not possible.

The cable shield is electrically connected to the metallic enclosure of the

plug-in connector and the sensor which are coupled to GND (VDR

, in

parallel with 100 nF). The shield and / or the enclosure should be con-

nected to an anti-interference potential, e.g. ground (depending on shield-

ing concept).

The appropriate protection class III (SELV) respective PELV (ac-

cording to EN 50178) has to be considered.

Operating voltage

The SCHMIDT®Flow Sensor SS 20.415 Twin is protected against a po-

larity reversal of its operating voltage.

It has a nominal operating voltage range of UB= 24 VDC ± 10 %.

Only operate sensor within the defined operating voltage range

(21.6 ... 26.4 VDC).

Undervoltage may result in malfunction, overvoltage may lead to

irreversible damage to the sensor.

The specifications for the operating voltage are valid for the connection at

the sensor. Voltage drops generated due to line resistances must be con-

sidered by the customer.

Current consumption of the sensor (incl. both signal outputs) in the con-

figuration with voltage outputs is typically

26 mA and at maximum 32 mA.

With current interfaces the sensor requires typically 30 mA and at maxi-

mum 45 mA.

Voltage dependent resistor; breakdown voltage 27 V @ 1 mA

Typical: wN= 0.45 m/s and UB= UB,Nenn ; maximum: wN= overflow and UB= UB,min

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 9

Analog signal outputs

The signal characteristic as current or voltage interface is defined on or-

dering and applies to both analog outputs commonly (see Table 3):

Current interface:

Signal range: 4 ... 20 mA

Type: High side driver, load resistance against GND

Maximum load resistance RL: 300 Ω

Maximum load capacity CL: 100 nF

Maximum cable length: 100 m

Wiring:

Voltage output:

Signal range: 0 ... 10 V

Type: High side driver, load resistance against GND

Minimum load resistance RL: 10 kΩ

Maximum load capacity CL: 10 nF

Maximum short-circuit current: 35 mA (current limited)

Maximum cable length: 10 m (recommended)

Wiring:

The voltage drop in the GND wire7of the connecting cable (mass

offset) may cause a significant distortion of the analog voltage

output signal.

The specific resistance of a lead of the nominal cable (0.14 mm2) is 0.138 /m (20 °C);

at L = 10 m a current of IB,U,max = 32 mA can cause a voltage drop up to 50 mV.

Instructions for Use - SCHMIDT®Flow Sensor SS 20.415 Twin Page 10

5 Signalizing

Analog outputs

The following applies to both output variants of the SS 20.415 Twin:

Representation of measuring range:

The measuring range of flow velocity (0 … wN,max) is mapped in a linear

way to the signal range of the respective interface type (see Table 3).

Voltage interface (U)

Current interface (I)



  



  󰇛  󰇜

Table 3

Overflow:

Flow speeds exceeding the measuring range are furthermore output in

a linear way up to 110 % of the measuring range (11 V or 21.6 mA), to

signalize clearly that there is an overflow.

For higher values of flow the output signal remains constant.

Error signaling:

The voltage version (0 … 10 V) is set to 0 V.

The current interface (4 … 20 mA) signalizes 2 mA.

Response time (damping of measured values):

By default the response time of flow measurement is 5 s.

LED light ring

The SS 20.415 Twin indicates its current operating state via a light ring in

its bracket:

Colour signal

Function / failure

None

Supply voltage: None / reversed / too low

Green pulsing (2 Hz)

Supply voltage: Too high

Green blazing

Sensor operational

Table 4

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