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SITRANS WW100 is one of the most accurate in-motion weighing systems on the market. It is specially designed for high accuracy
on light loading processes. The design eliminates material buildup to ensure accurate, reliable measurement.

The unique long length platform weigh bridge mounts directly to a corrosion-resistant platform load cell. An adjustable mechanical
shear gate profiles the material and fixes the correct material bed depth for a given material particle size. The belt speed can
be automatically adjusted to attain the correct feed rate.

Standard components include an anti-static food grade belt, gravity tensioned roller, tail pulley driven belt for maximum
weighing accuracy, belt tracking rollers, belt scraper and plow for self-cleaning.

Обзор

SITRANS WW100 is a high-accuracy, low-capacity weighfeeder used for minor ingredient additives.

Чертеж

SITRANS WW100 dimensions in mm (inch)

SITRANS WW100 dimensions in mm (inch)

Особенности

  • High accuracy
  • High turn down ratio 100 … 10 % of capacity
  • Corrosion resistant components
  • Fast and easy belt removal for replacement or cleaning
  • Simple installation, easy to clean and maintain
  • Pre-programmed drive for servo motor control

Схема подключения

SITRANS WW100 connections

Технические данные

 

Mode of operation

 

Measuring principle

Strain gauge load cell and digital speed sensor

Typical application

Control and monitor feed rates and blending in bulk chemicals, tobacco, food, and water treatment

Measuring accuracy

 

Accuracy1)

± 0.25 … 0.5 %

Specified range

10 … 100 % based on speed

Design rate range

45 kg/h … 18 t/h (100 lb/h … 20 STPH)

Max volumetric flow

45 m3/h (1 568 ft3/h)

Medium conditions

 

Operating temperature

-10 … +55 °C (10 … 131 °F)

Material

Mild steel or stainless steel
[304 (1.4301) or 316 (1.4401)], bead blast finish (1 ... 6 µm, 40 ... 240 µin)

Load cells

 

Construction

17-4 PH (1.4568) stainless steel or nickel plated alloy steel

Degree of protection

  • Stainless steel: IP68
  • Nickel plated alloy steel: IP66

Excitation

10 V DC nominal, 15 V DC maximum

Output

2 mV/V

  • Non-linearity

± 0.02 % of rated output

  • Non-repeatability

± 0.01 % of rated output

Capacity

  • Stainless steel range: 6, 12, 30 kg
  • Nickel-plated range: 10, 15, 20, 30 kg

Overload

150 % of rated capacity

Temperature

  • Operating range: -40 … +65 °C (-40 … +150 °F)
  • Compensated: -10 … +40 °C (15 … 105 °F)

Speed sensors

 

Optical encoder output

  • RS422 (TTL) 5 V DC, 150 mA max.
  • 500, 1 000, or 2 000 pulses per revolution (ppr)

Degree of protection

  • Standard: IP64
  • Stainless steel: IP66

Temperature

-10 … +70 °C (+14 … +158 °F)

Framework

  • Precision machined, stainless [304 (1.4301) or 316 (1.4401)] or mild steel
  • Cantilevered design for easy belt replacement

Pulleys

115 mm (4.5 inch) diameter, crowned and lagged

Bearings

  • 4-bolt flange mount on drive pulley
  • 2-bolt threaded base pillow block on driven pulley

Belt speed

0.005 … 0.36 m/s (1 … 70 fpm)

Belt support

Slider bed frame

Belting

  • Polyester carcass with polyurethane top cover and static control with vulcanized endless finger splice for max. weighing consistency (standard)
  • Maximum rated material temperature
    of 82 °C (180 °F)
  • Low capacity thermoplastic belt rated for max. material temp. of 100 °C (212 °F)

Belt tension

  • Counter-weighted stainless steel [304 (1.4301) or 316 (1.4401)] tensioning idler for consistent tension, required for high accuracy weighing
  • Screw type, telescoper module with 25 mm (1 inch) travel, mild or stainless steel 304 (1.4301)

Belt cleaning

  • UHMW blade type with counterweight at the head pulley for cleaning product side of belt
  • Return plow
  • Cleaning brush, optional

Drive motor

  • 0.24 kW (0.32 HP) TEFC, 10:1 CT inverter duty, servo drive motor with direct coupled flange mounted hollow bore worm CAF28 gear reducer 45.6 Nm (404 lb), 2.1 service factor minimum (standard)
  • 0.55 kW (0.75 HP), TEFC, 10:1CT inverter duty, AC drive motor with direct coupled flange mounted hollow bore worm CAF28 gear reducer 81 Nm (717 in. lb), 3.12 service factor minimum (optional)

Variable frequency drive: SINAMICS S110 servo motor controller (included with supply of WW100 based on ordering options)

  • 1 Ph, 200-240 V OR 3 Ph, 380 … 480 V
  • MMC with Factory loaded program for fast installation and commissioning
  • BOP for local control
  • External 24 V DC power supply
  • RS 232 connection port
  • 4 DI, D0
  • Profibus DP
  • Starter software & connection drawings provided with documentation

Shipping weight

91 kg (200 lb)  … 181 kg (400 lb) maximum

Approvals

CE, RCM
Stainless steel options meet USDA and FDA requirements for food processing



1) Accuracy subject to: On factory approved installations the weigh feeder system’s totalized weight will be within the specified accuracy when compared to a known weighed material test sample. The test rate must be within the specified range of the design capacity and held constant for the duration of the test. The minimum material test sample must be equivalent to a sample obtained at the test flow rate for three revolutions of the belt or at least ten minutes running time, whichever is greater.

 

Reduction ratio selection table

 

Reduction

(X:1)

Speed

60 Hz

fpm

60 Hz

m/s

50 Hz

fpm

50 Hz

m/s

372:1

max.

min.

5.54
0.55

0.028
0.003

4.59
0.45

0.023
0.002

303.36:1

max.

min.

6.80
0.68

0.035
0.003

5.63
0.56

0.029
0.003

248:1

max.

min.

8.31
0.83

0.042
0.004

6.89
0.69

0.035
0.003

202.24:1

max.

min.

10.19
1.02

0.052
0.005

8.45
0.84

0.043
0.004

155:1

max.

min.

13.30
1.33

0.068
0.007

11.02
1.10

0.056
0.006

126.4:1

max.

min.

16.31
1.63

0.083
0.008

13.51
1.35

0.069
0.007

93:1

max.

min.

22.17
2.22

0.113
0.011

18.37
1.84

0.093
0.009

75.84:1

max.

min.

27.18
2.72

0.138
0.014

22.52
2.25

0.114
0.011

62:1

max.

min.

33.25
3.33

0.169
0.017

27.55
2.76

0.140
0.014

50.56:1

max.

min.

40.78
4.08

0.207
0.021

33.79
3.38

0.172
0.017

46.5:1

max.

min.

44.34
4.43

0.225
0.023

36.74
3.67

0.187
0.019

37.92:1

max.

min.

55.44
4.37

0.276
0.028

45.05
4.50

0.229
0.023

31:1

max.

min.

66.51
6.65

0.338
0.034

55.10
5.51

0.280
0.028

25.28:1

max.

min.

81.55
8.16

0.414
0.041

67.57
6.76

0.343
0.034



 

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