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Instructions for Use

– SCHMIDT

Flow Sensor SS 20.700

Page 21

This pulse output is protected by means of different mechanisms:



Current limiting:

The current is limited to approx. 100 mA (analog).
If the resistance value is too low, the length of the interconnection
phases are limited to 100 µs (period duration: 1 s).
The maximum load capacitance C

is 10 nF. A higher capacitance re-

duces the limit of the current limiter.

In case of a high capacitive load C

, the inrush current peak

may trigger the quick-reacting short-circuit protection (perma-
nently) although the static current requirement is below the
maximum current I

S,max

. An additional resistor connected in se-

ries to C

can eliminate the problem.



Protection against overvoltage.

The pulse output is protected against short-term overvoltage peaks
(e.g. due to ESD or surge) of both polarities by means of a TVS diode

Long-term overvoltage destroys the electronics.

Overvoltage can destroy the pulse output.

Wiring of pulse output 2 (relay)

This output is realized by a semiconductor relay (SSR):

Maximum leakage current I

Off,max

: 2 µA

Maximum resistance R

Ω (typ. 8



)

Maximum switching current I

50 mA

Maximum switching voltage U

30 V

/ 21 V

AC,eff

Wiring:

Figure 4-5

The relay output is only protected against short-term overvoltage peaks
(e.g. due to ESD or surge) of both polarities by means of a TVS diode.

The output has no protective measures, exceeding the specified
electrical operating values leads to irreversible damage.

Transient Voltage Suppressor Diode, breakdown voltage approx. 30 V

Содержание SS 20.700

Страница 1: ...SCHMIDT Flow Sensor SS 20 700 Instructions for Use ...

Страница 2: ...tion range 4 3 Mounting instructions 6 4 Electrical connection 17 5 Signaling 22 6 Commissioning 28 7 Information concerning operation 28 8 Service information 29 9 Dimensions 32 10 Technical data 33 11 Declarations of conformity 35 Imprint Copyright 2022 SCHMIDT Technology GmbH All rights reserved Version 568365 02 Subject to modifications ...

Страница 3: ...uc tions for use will forfeit any warranty and exclude any liability The unit is designed exclusively for the use described below refer to chapter 2 In particular it is not designed for direct or indirect protec tion of personal or 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 f...

Страница 4: ...e standard version only by the use of a special compression fitting Its sealing O ring consists of BAM3 approved FKM which is coated with an oxygen suitable lubri cant The variant Grease free and Oxygen O2 21 PWIS free is also suitable for the use in concentrated oxygen but in addition its com pletely free of any lubricant Aside from that the seal of the compres sion fitting is realized with a cla...

Страница 5: ...e oxygen contacting sensor parts with bare hands Use clean and non fluffy gloves or cloths or similar to handle the sensor Version for special gases The version of the SS 20 700 for special gases receives a gas specific adaption for the measurement of certain gases and gas mixtures The sensor is adjusted and calibrated in air Then a special correction function for the medium to be measured is appl...

Страница 6: ...onal clamping The compression fitting as well as a pressure protection kit is included in the scope of delivery Due to the variety of applications the compression fitting exists in different versions On the one hand they are determined by the design of the ex ternal thread order option G or R on the other hand by the materials and properties of the sealing Standard O Ring NBR Oxygen O2 O Ring FKM ...

Страница 7: ...y a thermal decou pling section of the sensor tube having a free standing length of at least 50 mm see Figure 3 1 or by means of other suitable measures Figure 3 1 The permissible operating temperature range of the electronics must not be exceeded by crosstalk of the medium temperature on the sensor housing Flow characteristics Local turbulences of the medium can cause distortion of measurement re...

Страница 8: ...wo sensor tubes at the tip of the sensor head is the temperature sensor It consists of an unheated temperature depend ent resistor which measures the temperature of the medium The aerodynamically optimized design allows tilting around the longitudi nal axis of the sensor up to 3 relative to the ideal measuring direction see Figure 3 2 without significant impact on the measurement result5 The axial...

Страница 9: ...rresponding distances is defined by the inner diameter of the pipe because the flow abatement depends directly on the aspect ratio of measuring distance and diameter Therefore the required abatement distances are specified as a multiple of the inner pipe diameter D Besides the degree of turbulence generation by the corresponding dis turbing object plays an important role A slightly curved bend dir...

Страница 10: ...L2 Light bend 90 10 x D 5 x D Reduction expansion 90 bend T junction 15 x D 5 x D Two 90 bends in one plane 2 dimensional 20 x D 5 x D Two 90 bends with 3 dimensional change in direction 35 x D 5 x D Shut off valve 45 x D 5 x D Table 1 Run in and run out distances The profile factors specified in Table 2 may become void by the use of flow rectifiers ...

Страница 11: ... 9 3 1 153 4 306 8 920 3 1380 2147 3374 0 804 100 8 108 0 4 6 231 0 462 0 1385 2078 3233 5081 0 812 125 0 133 0 7 2 358 7 717 5 2152 3228 5022 7892 0 817 150 0 159 0 10 4 519 8 1039 3118 4677 7276 11434 0 829 206 5 219 1 20 0 999 5 1999 5997 8995 13993 21989 0 835 260 4 273 0 32 0 1700 3201 9605 14408 22412 35219 0 840 309 7 323 9 45 6 2278 4556 13668 20502 31892 50116 0 841 339 6 345 6 54 8 2742 ...

Страница 12: ...ns Quasi uniform flow field The lateral dimensions of the flow guiding system are approximately as large as its length in the flow direction and the flow velocity is small so that a stable trapezoidal8 speed profile of the flow is formed The width of the flow gradient zone at the wall is negligible in relation to the cham ber width so that a constant flow velocity can be expected over the whole ch...

Страница 13: ...2 𝑏𝑅 ℎ𝑅 2 𝑏𝑅 ℎ𝑅 𝑏𝑅 ℎ𝑅 Figure 3 4 According to this the volume flow in this duct is calculated as 𝐴𝐻 𝜋 4 𝐷𝐻 2 𝜋 4 2 𝑏𝑅 ℎ𝑅 𝑏𝑅 ℎ𝑅 2 𝜋 𝑏𝑅 ℎ𝑅 𝑏𝑅 ℎ𝑅 2 𝑤 𝑁 𝑃𝐹 𝑤𝑁 𝑉 𝑁 𝑤 𝑁 𝐴𝐻 𝑃𝐹 𝜋 𝑏𝑅 ℎ𝑅 𝑏𝑅 ℎ𝑅 2 𝑤𝑁 bR hR Width height of the square chamber m DH Hydraulic inner diameter of the chamber m AH Cross section area of the equivalent pipe m2 N w Maximum flow velocity in the middle of the duct pipe m s N w Average flo...

Страница 14: ...ressure media and mount the pressure protection kit Drill a mounting bore in pipe wall Weld pipe sleeve with an internal thread G or R on to the pipe in the center above the mounting bore Recommended length of sleeve 15 40 mm Plug holding bracket of pressure protection chain into thread of the compression fitting Screw threaded part of compression fitting tightly into the pipe sleeve hexagon AF27 ...

Страница 15: ... ble level on the alignment plane of the sensor enclosure The angular deviation should not be more than 3 related to the ideal measuring direction Otherwise measurement accu racy may be affected In case of wrong adjustment the compression fitting has to be loos ened and the alignment procedure must be repeated Shorten safety chain by removing superfluous chain links so that the chain is slightly t...

Страница 16: ...lated Polyamide PUR PP Halogen free11 Coupler socket With thread locking 524929 Threaded ring knurl Material Brass nickel plated Polyamide PUR PP Connection of wires Screwed 0 25 mm2 Sleeve12 a 524916 b 524882 Internal thread G R Material a Steel black b Stainless steel 1 4571 Table 3 Accessories Informations about further accessories for mounting and display are avail able on the SCHMIDT homepage...

Страница 17: ... series 763 Pin numbering View on connector of sensor Figure 4 2 Pin Name Function Wire color 1 Pulse 1 Output signal Flow volume digital PNP White 2 UB Operating voltage 24 VDC 20 Brown 3 Analog TM Output signal Temperature of medium Auto U I Green 4 Analog wN Output signal Flow velocity Auto U I Yellow 5 AGND Reference potential for analog outputs Gray 6 Pulse 2 Output signal Flow volume digital...

Страница 18: ...operating voltage For its intended operation it requires a DC voltage of 24 VDC with a tolerance of 20 Operate the sensor only within the specified voltage range of 24 VDC 20 Undervoltage may result in malfunction overvoltage may lead to irreversible damage Specifications of supply voltage apply to the connector of the sensor Volt age drops generated due to line resistances must be taken into acco...

Страница 19: ...otential for the signal output The supply line GND can also be used as reference potential however the ground offset can cause significant measurement errors in the Voltage operating mode AGND should generally be selected as reference potential for the analog signal outputs Figure 4 3 Depending on the load resistance RL the signal electronics switches automatically between its operation as voltage...

Страница 20: ... collector PNP Minimum high level US H min UB 3 V with maximum switching current Maximum low level US L max 0 V Short circuit current limitation Approx 100 mA Maximum leakage current IOff max 10 µA Minimum load resistance RL min Depending on switching voltage UB see below Maximum load capacitance CL 10 nF Maximum cable length 100 m Wiring Figure 4 4 This pulse output can be used for direct driving...

Страница 21: ...L can eliminate the problem Protection against overvoltage The pulse output is protected against short term overvoltage peaks e g due to ESD or surge of both polarities by means of a TVS diode19 Long term overvoltage destroys the electronics Overvoltage can destroy the pulse output Wiring of pulse output 2 relay This output is realized by a semiconductor relay SSR Maximum leakage current IOff max ...

Страница 22: ...blem see Table 5 Figure 5 1 No State LED 1 LED 2 LED 3 LED 4 1 Ready for operation flow 5 21 2 Flow 5 3 Flow 20 4 Flow 50 5 Flow 80 6 Flow 100 overflow 7 Sensor element defective 8 Operating voltage too low 9 Operating voltage too high 10 Electronic temperature too low 11 Electronic temperature too high 12 Medium temperature too low 13 Medium temperature too high Table 5 LED off LED on Orange LED ...

Страница 23: ...1 I2 LEDs near both connectors O outside I inside see Figure 5 2 O I alternating flashing LED pairs O1 O2 and I1 I2 flashing alternately Light ring signalization Status of module communication Module Blue rotating 2 R s 5 x Contacting Sensor module In Progress Blue O I alternating flashing 2 Hz Communication sensor module Active Blue simultaneous flashing 1 Hz Communication sensor module Frozen Or...

Страница 24: ...ded to select the load resistance such that a safe detection can be maintained 300 Ω for current mode and 10 kΩ for voltage mode To detect possible alternating load in an actual zero signal voltage mode the electronics generates test pulses that correspond to an ef fective value of approx 1 mV However the latest measuring devices may trigger in response to such a pulse in DC voltage measuring mode...

Страница 25: ...ring range wN max see Table 8 Voltage mode U Current mode I 𝑤𝑁 𝑤𝑁 𝑚𝑎𝑥 10 𝑉 𝑈𝑂𝑢𝑡 𝑤𝑁 𝑤𝑁 𝑤𝑁 𝑚𝑎𝑥 16 𝑚𝐴 𝐼𝑂𝑢𝑡 𝑤𝑁 4 𝑚𝐴 Table 8 Representation specification for flow velocity measurement The measuring range of medium temperature starts at TMin 20 C and ends at 120 C see Table 9 Voltage mode U Current mode I 𝑇𝑀 140 𝐶 10 𝑉 𝑈𝑂𝑢𝑡 𝑇𝑀 20 𝐶 𝑇𝑀 140 𝐶 16 𝑚𝐴 𝐼𝑂𝑢𝑡 𝑇𝑀 4 𝑚𝐴 20 𝐶 Table 9 Representation specification fo...

Страница 26: ... The analog output for TM switches to error 0 V or 2 mA 24 The measuring function for flow velocity is switched off its analog output also signals an error 0 V resp 2 mA o Medium temperature above TM max 120 C TM is output in a linear way up to at least 125 C flow velocity is measured and displayed further on Above this critical limit flow measurement is switched off and the analog output wN switc...

Страница 27: ...frequency the meas uring range wN max of the sensor and the inner pipe diameter D 𝑉 𝑁 𝑤𝑁 𝑃𝐹 𝐴𝐷 𝑤𝑁 𝑃𝐹 𝜋 4 𝐷2 𝑉𝑁 𝐼𝑚𝑝 𝑉 𝑁 𝑚𝑎𝑥 𝑓𝑚𝑎𝑥 Exceeding the measuring range is also output linearly up to 110 of the measuring range Higher values of flow velocity or volume flow are limited to 110 of the measuring range Optional the sensor can be configured by ordering to supply pulses with a predefined pulse valenc...

Страница 28: ...he sensor detects a problem during initialization it signals the problem with the cover LEDs according to Table 5 An extensive overview of pos sible errors their causes as well as troubleshooting measures are listed in Table 10 In addition the ring LEDs shows Complete lights green sensor is fully operational Comlete ring flashes red sensor is defective If the sensor is operating as intended after ...

Страница 29: ...ation at reg ular intervals and cleaned if necessary Condensing liquids or even immersion in a liquid lead to a strong falsifica tion of the measured values After drying correct measured values are provided again Always avoid liquids on the sensor during operation because it leads to serious measurement distortions 8 Service information Maintenance and cleaning of sensor head Heavy soiling of the ...

Страница 30: ...emperature too low Increase temperature of environment Electronic temperature too high Lower temperature of environment Medium temperature too low Increase medium temperature Medium temperature too high Lower medium temperature Flow signal wN is too large small Measuring range too small large I mode instead of U mode or vice versa Medium to be measured does not correspond to adjustment medium Sens...

Страница 31: ...t in to the supplier for repair A completed declaration of decontamination must be attached The appropriate form Declaration of decontamination is enclosed with the sensor and can also be downloaded from www schmidt sensors com under the heading Service Support for Sensors Alternatively it can be downloaded from www schmidttechnology de under the heading Service Support für Sensorik If the sensor ...

Страница 32: ...Instructions for Use SCHMIDT Flow Sensor SS 20 700 Page 32 9 Dimensions Compact sensor Figure 9 1 Remote sensor including wall mounting bracket Figure 9 2 ...

Страница 33: ...Measuring range TM 20 120 C Measuring accuracy26 Standard wN 3 o m v 0 4 o f v min 0 08 m s 27 Response time t90 wN 10 s jump of wN from 0 to 5 m s in air Temperature gradient wN 8 K min at wN 5 m s Measuring accuracy28 TM 1 K 10 30 C 2 K remaining measuring range Operating temperature Sensor probe 20 120 C Electronics 20 70 C Storage temperature 20 85 C Material Enclosure Anodized aluminum Sensor...

Страница 34: ...z Option 1 pulse 1 m 1 pulse 0 1 m 1 pulse 0 01 m max 100 Hz High side driver connected to UB without galvanic separation High level UB 3 V Short circuit current limitation 100 mA Leakage current IOff 10 µA Semiconductor relay output galvanically separated Max 30 VDC 21 VAC eff 50 mA Electrical connection Main connector M12 A coded male 8 pin Module connector M12 A coded female 5 pin Maximum cable...

Страница 35: ...ole responsibility that the product SCHMIDT Flow Sensor SS 20 700 Part No 562 140 is in compliance with the appropriate European guidelines and standards and UK statutory requirements and designated standards The corresponding declarations of conformity can be download from SCHMIDT homepage www schmidt sensors com www schmidttechnology de ...

Страница 36: ...DT Flow Sensor SS 20 700 Page 36 SCHMIDT Technology GmbH Feldbergstr 1 78112 St Georgen Germany Phone 49 0 7724 899 0 Fax 49 0 7724 899 101 Email sensors schmidttechnology de URL www schmidt sensors com www schmidttechnology de ...

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