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Enraf Servo 954
Brand: Honeywell Process SolutionsHoneywell Enraf has ensured that the industry’s best tank gauging solution is now even better. Designed for measuring all kinds of liquids in any type of storage tank, our new Smart Servo 954 is a reliable, versatile and accurate automatic tank gauge. This instrument advances the art of tank gauging by combining proven technology with enhanced electronics and software, as well as increased intelligence. And, it stands up to the most demanding process conditions
What Is It?
Enraf’s automated tank gauging has been leading offerings for more than 30 years now with more than 65,000 Servo’s installed world-wide. Honeywell continues to invest in this flagship product line and we now have an upgraded version of our field-proven 854 ATG which now can address even more applications in a challenging process environment. Enraf Servo 954 is designed for accurate and reliable measurement in liquid / vaporized liquid applications with extended level & temperature ranges. This embraces modular design offering utmost flexibility to choose options needed for your specific application. The advancements in software algorithms further enhance its performance by making it the most accurate, reliable and versatile gauge in tank farms / terminals.
How Does It Work?
Enraf Servo 954 multi-function device provides a flexible and adaptable solution for a wide range of measurements and interface options needed for safe and efficient terminal operations
- Product level
- Interface level
- Product and gas temperature with spot or average temperature measurement, or temperature profiling
- Density measurement and profiling
- Direct water bottom measurement or via capacitive probes
- Average continuous density monitoring connecting one or more HART pressure transmitters
- SIL certified NO/NC alarm relay contact or 4-20 mA output for direct connection to a Distributed Control System (DCS), or safety and overfill protection systems such as Honeywell
- Accurate measurement in liquids including vaporized applications
- Improve reliability under dynamic conditions
- Maximize storage capacity with the lowest safety diagnostic cycle time
- Enhanced safety with SIL certified AO/DO options for overfill prevention
- Modular design for ease of maintenance
- Simple & cost-effective: migrations for legacy & 3rd party gauge
- One-stop integrated gauging solution for all your terminal needs
- Measurement ranges up to 150 m
- Working pressure up to 40 bar
Specifications
Baud rate
- 1200 / 2400 bps
Cable characteristics
- 2 wires, twisted pair, Rmax = 200 Ohm / line, Cmax = 1uF; cable length: 10 km (6 miles) or more *1
Isolation voltage
- > 1,500 V
Lightning protection
- Full galvanic separation via isolating transformers
Protocol
- Standard Honeywell fieldbus (Serial, ASCII, GPU protocol)
Common mode rejection
- > 150 dB
TRL/2 Protocol
- Modbus RTU; Communication: TRL/2 100/90 KHz FSK
TRL/2 Baud rate
- 4800, 8 bits and 1 stop bit.
TRL/2 Lightning protection
- Opto-Isolators
TRL/2 Cabling
- 18 AWG (minimum) with shielded twisted pair, max 4 km with max 8 multi drop Gauge connections
TRL/2 Physical layer
- Logic 1 is represented by 100kHz and Logic 0 by 90khz:(± 3 %)
TRL/2 Voltage levels
- 3.6 V ± 10 %
TRL/2 Power rating
- At 12 V Nominal current drawn by TRL/2 module alone is 40 mA (± 10 %), [power consumption is 480 mW (± 10 %)]. The worst case current/power drawn with below mentioned conditions is 60 mA.
HART® Slave Protocol
- Communications: HART 7
Analog output loop (non-I.S.)
- Active or Passive; selectable by jumper - Active: output voltage: 20 V ± 5 % - Passive: minimum external supply voltage: 11.5 V maximum external supply voltage: 30 V (55 V with serial resistor)
Accuracy
- ± 0.1 % of actual measurement
Hardware alarms (1x SPDT)
- 250 Vac, 2 A (40 Vdc, 2 A)
Hardware alarms (2x SPDT)
- 250 Vac, 2 A (40 Vdc, 2 A
Relay operation
- - Normally Open/Normally Closed contact: selectable by jumper - Normally Energized / Normally De-energized: configurable by software setting - PV Monitor (any of the measured parameters, configurable by software setting) - Remote control (configurable by software setting)
SIL Digital Output
- 1 x SIL DO contact (1 x SPDT contact, 2 A at 250 Vac or 2 A at 40 Vdc, Pmax = 500 W)
- 2 x SIL DO contact (2 x SPDT contact, 2 A at 250 Vac or 2 A at 40 Vdc, Pmax = 500 W)
SIL Analog Output
- SIL AO NAMUR NE43 compliant
Communications
- Proprietary HART (Ex-i
SIL Digital Output + Analog Output
- SIL AO + 1 SIL DO contact NAMUR NE43 compliant (1 x SPDT contact, 2 A at 250 Vac or 2 A at 40 Vdc, Pmax = 500 W)
- SIL AO + 2 SIL DO contacts NAMUR NE43 compliant (2 x SPDT contact, 2 A at 250 Vac or 2 A at 40 Vdc, Pmax = 500 W)
Resolution
- - Temperature measurement: 0.01° C (0.01° F) - Water level measurement: 0.1 mm (0.01”)
Configurations
- - 3-Wire or 4-Wire RTD, one element or two elements *4 - MPT or MRT up to 6 elements with 2 common ground wires *4
HART® Input Configurations
- Options - 5 HART inputs and / or HIMS density calculation - VITO sensors and / or 3 HART inputs - 3 HART input, HIMS density calculation and VITO sensors
Max. instruments per module
- 5 (digital) or 1 (analog)
Cable entries
- Adapters available to fit other sizes cable glands
Level measuring range Standard
- 27 m (88 ft) Pos 18 = A, B, C
Level measuring range Extended
- 37 m (121 ft) Pos 18 = E, F 40 m (131 ft) Pos 18 = H, 45 m (147 ft) Pos 18 = K, 35 m (115 ft) (with measuring wire up to 150 m (492 ft)) Pos 18 = M; For longer ranges, please contact factory
Measuring accuracy level
- 40 m (131.2 ft): < ± 0.4 mm (± 0.016”) *5; 40 m (131.2 ft): OIML R85 certified (Pos 5 = X); 45 meter with +- 1 mm accuracy last 35 meter with +- 1 mm accuracy on 150 m wire
Measuring accuracy interface
- < ± 2 mm (± 0.08”) *6
Measuring accuracy temperature
- < ± 0.1° C (± 0.18° F) *5
Sensitivity
- ≤ 0.1 mm (± 0.004”) *5
Weight Cable entries
- 4 x 3/4” NPT threaded (2* I.S. + 2* non-I.S.)
Operating pressure M and C versions
- Up to 6 bar / 0.6 MPa (90 psi); Pos 14
Repeatability
- ≤ 0.1 mm (± 0.004”) *5
Density measurement
- With density firmware (Pos 20 = D and density displacer (Pos 19 - E or F)
Operating pressure M and C versions
- Up to 6 bar / 0.6 MPa (90 psi); Pos 14
M and C versions
- Up to 6 bar / 0.6 MPa (90 psi); Pos 14
Measuring accuracy servo density
- < ± 3 kg/m3 (± 0.19 lb/ft3)
Operating pressure H version
- Up to 40 bar / 4 MPa (600 psi) (up to 25 bar / 2.5 MPa in acc. to PED)
Weight Medium pressure version
- 16 kg (35 lb)
Max. process temperature
- +200° C (+392° F), drum housing must be kept below +65° C (+149° F) *7
Weight Chemical version
- 21 kg (46 lb)
Min. process temperature
- -200° C (-328° F), drum housing must be kept above -40° C (-40° F) *7
Weight High pressure version
- 26 kg (57 lb)
Drum compartment
- Cast aluminum Int. reg. AA A356 EN1706 AC-AlSi7Mg0.3; Pos 14 = A or M
- Stainless steel ASTM A351, CF-8M, G-X6 CrNiMo 18 10 (1.4408); Pos 14 = H or C
Measuring drum, drum shaft
- Stainless steel (1.4401) EN10088 AISI 316
Magnet cap
- Stainless steel (1.4401) EN10088 AISI 316
O-rings
- Drum cover Silicone/FEP; others FPN (Viton); Special O-ring (Perlas®) available for demanding chemical applications (such as Ammonia), part nr. S0854969
Servo comp. and cover Material
- All types cast aluminum Int. reg. AA A356 EN1706 AC-AlSi7Mg0.3
Finish aluminum parts Material
- Conforms to MIL-DTL-5541F
Ambient temperature
- -40° C to +65° C (-40° F to +149° F)
Storage temperature
- -50° C to +70° C (-58° F to +158° F)
Protection class
- IP66 / IP67 accordingto EN 60529 (NEMA 4X)
Safety
- Explosion proof
- - II 1/2 G Ex d IIB T6 Ga/Gb or Ex de IIB T6 Ga/Gb or Ex d [ia Ga] IIB T6 Ga/Gb or Ex de [ia Ga] IIB T6 Ga/Gb; acc. to ATEX KEMA
- - Class I, Div. 1, Group C & D; acc. to FM
- - Class I, Group C & D acc. to CSA certificate
- Consult factory for other approvals and updates
Power supply
- Autoselect 65 Vac to 240 Vac, 50/60 Hz and/or 24 Vdc to 65 Vdc
Power rating
- 11 Wmax continuously