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System components The ViscoSense®2 viscosity system consists of: • the combined viscosity and temperature measuring sensor • the sensor housing • Interface box

Figure 1 ViscoSense ®2 components Principle of operation

The operating principle of the sensor is that of a torsion pendulum. The sensor consists of a stainless steel driver / sensor head (1), attached to the base plate (2) by means of a tubular torsion spring (3). In the head, one pair of piezo elements (driver piezos) (4) actuates the pendulum at its torsional resonance frequency, while another pair (the receiver piezos) probes the actual movement of the head. In a low viscosity medium, like air the resonance frequency is in the range of 1600 Hz. In a high viscosity medium the movement of the head is damped by the liquid. Consequently, the resonance frequency slightly shifts towards lower frequencies, whilst the width of the resonance peak increases, which is a measure for the viscosity. A flow tube (5) is placed around the pendulum, to protect it against mechanical damage. The flowtube inlet ensures a constant new supply of liquid for a correct measurement.

The sensor housing is made of ductile iron and has flanges for direct mounting in the fuel line. The sensor itself is made of stainless steel and is mounted in the housing. Two parts of the sensor, the sensor head and flowtube have a special Teflon® coating. It is supplied with 5 metres of signal cable for connection to the interface box. The ViscoSense®2 Interface box is a wall mount electronic unit, processing the signals to and from the sensor. It provides 4..20 mA signals for remote read-out of viscosity and temperature for a controller or other system elements. See separate technical manuals for a description of these components.

Figure 2 ViscoSense®2 sensor

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Technical specification Sensor Viscosity range 0 .. 25/50 mPa.s (other ranges on request) Maximum operating temperature 180°C Temperature transmitter PT 100 element Accuracy

Viscosity +/- 2% instantaneous or 0.5 mPa.s Temperature ± 1°C

Measuring range 0-200°C Material

Sensor Stainless steel 316L Coating Teflon®

Signal cable length 5 metres, integrated with sensor Protection class IP65 Weight 1 kg

Warning For hazardous zone I and II, the ViscoSense® Ex d version is required. (See technical manual TIB-769)

Sensor housing

Material housing ductile iron

Flange connections DN 50 mm (2”), DIN, ANSI or JIS DN 65 mm (2,5”), DIN, ANSI or JIS DN 80 mm (3”), DIN, ANSI or JIS DN 100 mm (4”), DIN, ANSI or JIS

Maximum pressure rating 40 bar

Weight 2” approx. 10 kg 2,5” approx. 11 kg 3” approx. 12 kg 4” approx. 13 kg

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System description Electric Heater Control cabinet (EHC cabinet)

The EHC cabinet has been designed for automatic control of the injection Viscosity of heavy fuel oil. The control action is realised by heating the fuel oil step by step to an appropriate temperature. The built-in viscosity/temperature controller with his programmed setpoint values activates more or less heater relays. Up to six stages are controlled by means of relays. The first stage is controlled by means of time proportional control. The function of this is to enable a linear control of power from zero to a maximum value. The power required under a certain load is adjusted by switching “ON” or “OFF” a number of stages, while the remaining fraction is added by the time-proportional control. The viscosity and temperature of the fuel oil will be measured with our VAF ViscoSense®, ViscoSense®2 system. For further details see Technical Manual TIB-756 and TIB-761.

Figure 4 Typical example of system lay-out

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System components

Figure 5 EHC Cabinet front cover

The EHC cabinet consists of: • 1 - Viscosity/temperature controller • 2 Signal lamp main supply • 3 thru 8 - Signal lamps heaters • 9 - Lamp heater temperature alarm • 10 - Main switch

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Technical specifications Cabinet construction Supply voltage 380 or 440 Vac, 3ph 50/60Hz

(Fluctuations should not exceed ± 10% of the nominal value).

Power consumption 250 VA

Input 4-20mA

Measured viscosity and temperature signals from Interface box.

Output Power Alarms Heater Supply Power

230 Vac 50/60Hz to Interface box High/low alarm viscosity, high/low alarm temperature and overheat contact from electric heater Six heater elements and one thermostat sensor. 380 or 440 Vac Max. 10.0 kW @ 380Vac, max. 11.5 kW @ 440Vac

Ambient temperature 0 … + 50° C

Humidity range 0 – 80% RH

Protection class IP 55

Mounting Wall mounting

Cable connections Power supply Input signals Output signals

cable diameter 18–25 mm (M32 x 1.5) cable diameter 6-12 mm (M20 x 1.5) cable diameter 9-16 mm (M25 x 1.5)

Wiring supply Output Input

2.5 mm² 0.5 mm² (5 x), 1.0 mm² (2 x), 1.5 mm² and 2.5 mm² (6 x) 24 AWG or 0.25mm² (2 x)

Fuses: Supply to heater elements Supply to heater element Output of transformer

6 automatic current breakers, 20A 2 fuses of 2A 1 fuse of 6.3A (24Vac), 1 fuse of 2A (230Vac) and 1 fuse of 1A to protect 24Vac, while one of the bulbs could have a short circuit.

Installation category 1 acc. to IEC 1010-1

Pollution degree 1 acc. to IEC 664

Material cabinet sheet steel

Dimensions 760 x 600 x 350 mm (H x W x D)

Colour Munsell 5Y 7/1 (RAL 7032)

Ventilation requirements no special requirements

Weight 40 kg

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Quotation and ordering information Please supply the following data when ordering an Electric Heater Control cabinet or requesting for a quotation. (tick √ as required) 1. Basic system designation: ViscoSence®2 2. Viscosity range □ 0-25 mPa.s □ 0-50 mPa.s □ special: _____________________________ 3. Viscosity reading on electronic controller: □ MPa.s. □ cSt 4. Flange type: □ DIN ______ □ ANSI ______ □ JIS _______ 5. Optional extra: □ Inspection by classification bureau Bureau name _________________________ 6. Maximum switching power for each of 6 heater stages □ 6 kW (220 V-3ph) □ 9,5 kW (380 V-3ph) □ 11 kW (440 V-3ph) □ 12 kW (480 V-3ph) □ other Name:__________________________ Place and date: __________________________

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voordruk VAF instru 24-06-2008 12:11 Page 2