Digital Level Sensor. Consistent accuracy, unparalleled reliability. Answers for energy.

Transcription

1 Digital Level Sensor Consistent accuracy, unparalleled reliability Answers for energy.

2 2 Consistent accuracy Unparalleled reliability

3 The Siemens Digital Level Sensor (DLS) is an engineered solution for remotely monitoring liquid levels in storage tanks. In addition to offering true digital level measurement in precise increments, it accurately and repeatedly measures two different fluid densities and up to eight temperatures on the same sensor. Its accuracy is maintained over the entire life of the sensor, thereby helping to reduce long-term maintenance costs. 3

4 Standard features, applications, benefits Intrinsically safe apparatus approved to meet UL913 standard for safety Low maintenance Temperature changes do not affect accuracy, unlike many other level sensing devices Applications include production monitoring, inventory control, leak detection, remote read-out of level in H2S environment, high/low alarms and many other applications All electronics are sealed inside the sensor tube Sensor tube available in stainless steel and fiberglass Intrinsically safe apparatus when connected to RLD model 1010 barrier board ETL-approved intrinsically safe barriers available to mount with the RTU Field wiring that connects to a surgeprotected fuse board shielding the sensor electronics from lightning damage Proven for use in many different fluids and environments, including crude oil, water, diesel, kerosene, condensate and gasoline Explosion-proof junction box suitable for connecting to rigid conduits Standard ASCII protocol for communicating with several existing remote terminal units via RS485/RS232 Digital-to-analog conversion available for outputting either a 4-20mA or 1-5 VDC analog signal 4

5 Model 1000 Digital Level Sensor specifications Measurement length Available from 2 to 30 in 1 increments Longer sizes available as custom orders Tubing material 316L stainless steel: standard 18 gauge: standard 14 gauge: optional Fiberglass: optional Float NYTROPHYL stainless steel: standard UHMW-NYTROPHYL: optional One standard, two optional for water interface Fits either 3 or 4 tank ports Level measurement increments and accuracy Standard 1/4 resolution (+/- 1/8 accuracy) 1/2 resolution (+/- 1/4 accuracy) Operating temperature range -40 F to +185 F: standard -40 F to +240 F: optional Power requirements 12 VDC +/- 15% at sensor terminals Power consumption 45mA nominal 70mA maximum Pressure 15 psi: standard Higher pressure ratings available as custom orders Communication RS485 Two- or four-wire communications Baud rate and parity programmable (up to baud) 4-20mA signal available when connected to digital-to-analog converter board Wiring Two-wire communication: two twisted pair, (16-18 AWG) recommended Four-wire communication: three twisted pair, (16-18 AWG) recommended Temperature measurement Display of F: standard First sensor 12 from bottom: standard 1-8 temperature sensors available with desired spacing: optional +/-.5 F accuracy 5

6 Model 1000 terminal unit The Model 1000 terminal unit is a solidstate stand-alone device designed to read the digital signal from the Model 1000 Digital Level Sensor (DLS) and convert it to an analog output. The intent is to enable the superior accuracy of the Model 1000 DLS to be used in a system that has only analog inputs available for receiving tank level data. This unit can poll up to 16 individual Model 1000 DLS units and output up to eight analog signals based upon data received from the Model 1000 DLS. The analog outputs are user programmable for either level or temperature from a particular sensor. Each analog loop can be set up to either source power or be powered by the host unit. This unit is programmable through a standard RS232 serial cable with RTS/CTS connected to a computer running the Model 1000 terminal configuration software or any terminal emulation software. Local readout for the tank levels and temperature are available with a four-line by 20-character LCD display. It will display up to two levels, temperature and tank volume for each tank. Sockets are provided for two optically isolated G4 digital output modules for alarming or controlling based on user programmable set points for any sensors. The G4 modules can control either AC or DC power to dry contact relays. An expansion board has been developed to allow for eight additional optically isolated G4 digital output modules. With this expansion board, a total of 10 digital outputs are available. 6 Mechanical specifications NEMA 4X enclosure Optional eight D/O expansion board can be mounted inside enclosure Electrical specifications Operating temperature range: -40 C to +85 C When equipped with LCD display, operating temperature is 0 C to 70 C Optional display heater for cold operating conditions Power requirements: 12 to 15 VDC Power consumption Standby without display: 75mA* Standby with display: 85mA* During scroll - LCD backlight: 210mA* (scrolling period is programmable) During poll: 100mA* (polling time = 2 sec max) Sleep mode: 9mA** Analog outputs: 20mA max per channel if unit sources loop power *Power consumption does not include connected level sensors. User must consider each sensor connected will draw an average 45mA. **Sleep mode is designed for stand-alone display applications with no digital or analog outputs programmed. RS232 port Provided for configuration and diagnostics 9600 baud, no parity, eight data bits, one-stop bit Communication: HyperTerminal or similar terminal emulation software using ASCII commands Configuration software available RS485 port Communication to the Model 1000 DLS Four-wire communications Cycles power to level Model 1000 DLS between polls 4-20mA conversion accuracy (except as limited by sensor and protocol resolution) Resolution: 16 bit Monotonicity: 16 bit min Integral non-linearity: +/- 0.01% of FS max offset (4mA) at 25 C +/- 0.1% of FS max Offset drift: +/- 25 ppm of FS/ C max Total output error: (20mA) at 25 C +/- 0.2% of FS max Total output drift: +/- 50 ppm of FS/ C max VCC supply sensitivity: 50 ma/mv typical Optional digital outputs Total of 10 output sockets available Two sockets provide for optically isolated G4 modules on board (G4 modules sold separately) Eight additional sockets with expansion board

7 Model 1000 four-channel output board Model 3005 analog board DAC4 The DAC4 is a solid-state stand-alone interface board that polls the Model 1000 DLS and outputs a 4-20mA analog signal for use by other field data collection equipment. The intent is to enable the superior accuracy of the Model 1000 DLS to be used in a system that has only analog inputs. The interface board can poll up to four Model 1000 DLS and output up to four analog signals based upon data received from these sensors. Not all analog channels need to be used. The analog signal can output the level or temperature data from a particular sensor. Electrical specifications Operating temperature range: -40 C to +85 C Power requirements: 12 to 15 VDC Power consumption Standby: 38mA During poll: 145mA* (polling time = 2 sec max) Analog outputs: 20mA max per channel if unit sources loop power *Power consumption does not include connected level sensors. User must consider each sensor connected will draw an average 45mA. RS232 port Provided for configuration and diagnostics 9600 or 1200 baud communicates using HyperTerminal or similar terminal emulation software using ASCII commands RS485 port Communication to the Model 1000 DLS Two- or four-wire communications Cycles power to Model 1000 DLS between polls 4-20mA conversion accuracy (except as limited by sensor and protocol resolution) Resolution: 16 bit Monotonicity: 16 bit min Integral non-linerarity: +/- 0.01% of FS max Offset (4mA) at 25 C: +/- 0.01% of FS max Offset drift: +/ ppm/ C Total output error: +/- 0.2% of FS max Total output drift: +/- 50 ppm/ C VCC supply sensitivity: 50 ma/mv For any specifications not listed above, please see the specifications listed under the Model 1000 terminal unit. The Model 3005 is designed to provide a single analog output from the Model 1000 DLS. It provides a 4-20mA signal output for the total fluid level of the tank. This is an alternative to the Model 1000 terminal unit. It is intended for locations requiring an analog signal for the tank level where only one or two tanks are on location. The Model 3005 replaces the fuse board in the explosion-proof housing on top of the Model 1000 DLS. It provides the same protection to the Model 1000 DLS as the fuse board provides. The Model 3005 requires 24 VDC and controls power to the level sensor. It powers the sensor on a preprogrammed schedule, polls for the level analog value, powers the sensor down and outputs the analog signal. The configurations for the Model 3005 are stored in the EEPROM of the Model 1000 DLS, allowing for replacement when required. Electrical specifications Operating temperature range: -40 C to +85 C Power requirements: 24 VDC +/- 10% Requires 125mA max Requires two wires for power and two wires for 4-20mA loop 4-20mA conversion accuracy (except as limited by sensor and protocol resolution) Resolution: 16 bit Monotonicity: 16 bit min Integral non-linearity: +/ % max Offset: +/- 0.05% max Total output error: +/- 0.15% max 7

8 Published by and copyright 2009: Siemens AG Energy Sector Freyeslebenstrasse Erlangen, Germany Siemens Energy, Inc. Oil and Gas Division Telge Road Houston, TX (888) or +1 (281) Order No. E50001-D440-A123-X-76US Printed in USA BU T BR All rights reserved. Trademarks mentioned in this document are the property of Siemens AG, its affiliates, or their respective owners. Subject to change without prior notice. The information in this document contains general descriptions of the technical options available, which may not apply in all cases. The required technical options should therefore be specified in the contract.