Omnicomm Fuel Level Sensor LLS 30160
19Pages

OMN 0 COMM FUEL MONITORING FOR TELEMATICS SOLUTIONS All rights reserved. ©2016 OMNICOMM

LIST OF ABBREVIATIONS, TERMS AND DEFINITIONS L — working length of the LLS fuel level sensor. M — measurement range of the product. CLS — capacitive fuel level sensor. Оffset — offset of the zero reference point of a measurement range. Waiting time — the time interval during which an external device is waiting for a response from the Product. Working length of the Product — length L presented in Figure 2. External device — any device possessing an RS-232 or EIA-485 interface and supporting the LLS fuel level sensor protocol. Time interval for data output — the time interval upon the expiry...

GENERAL This datasheet is designed to provide comprehensive information on the structure, operation principle and operating rules for the LLS 30160 fuel level sensor (hereafter referred to as the Product). The Product is intended to be operated in fuel of the following types: motor petrol, summer and winter diesel fuel and other light liquid petroleum products which retain their aggregative state within the operating temperature range. The case of the LLS 30160 fuel level sensor is made of black material. Depending on the working length, there are several modifications of the manufactured...

Operating Manual Fuel level sensor LLS 30160 | 5

INSTALLATION PROCEDURE Operation restrictions: • The ambient temperature should not exceed the values indicated in the performance specifications. • The minimum length for cutting the measuring piece is 150 mm. • The Product should not have mechanical defects, such as depressions, cracks or crooking. • You should prevent any damage to the insulation of the mounting cable. • You should use the Product only in liquid petroleum products which retain their aggregative state within the operating temperature range. • The use of a poor-quality fuel may result in the malfunction of the Product. •...

LABELING AND PACKAGE The case bears the following labels: • manufacturer's trade mark; • product name; • serial number of the Product according to the manufacturer's numbering system; • date of manufacture. The package bears the followings labels: • manufacturer's trade mark; • manufacturer's name; • Product name; • serial number. The set is delivered in a cardboard box. A group package is acceptable in the case of two or more Products. If this occurs, the package must exhibit the information about the number of Products inside. DISPOSAL Before disposal, please dismantle the LLS fuel level...

APPENDIX А STRUCTURE AND OPERATION PRINCIPLE The schematic structure of the Product is given in Figure 2. Figure 2. LLS 30160 block scheme (A5) А1 — CLS; А2 — frequency generator; А3 — microcontroller; А4 — temperature sensor; А5 — galvanic insulation. The capacitive fuel level sensor is a linear transducer that converts the fuel level into electric capacitance. Variations in the fuel level entail changes in the CLS capacitance (А1). The changed capacitance corresponds to the changed duration of the signal period which is produced by the generator (А2). The microcontroller (А3) converts the...

Figure 3. Length L of the LLS fuel level sensor measuring piece Figure 4. Mounting dimensions if the Product is mounted in a plastic/metal tank with wall thickness of more than 3 mm Operating Manual Fuel level sensor LLS 30160 | 9

Figure 5. Mounting dimensions if the Product is mounted in a metal tank with wall thickness of more than 3 mm Figure 7. Connector to connect an external device Operating Manual Fuel level sensor LLS 30160 | 10

DESCRIPTION OF THE DATA EXCHANGE PROTOCOL The fuel level sensor's communication protocol for data exchange with an external device consists of two parts: the public part intended for common use, and the private part. The private part is designed to configure the sensor's parameters using the Omnicomm Configurator software. The commands of the private part may change without an additional notification and may not be supported by certain LLS fuel level sensor models, although at the same time they are supported by the Omnicomm Configurator SW. The commands of the public part are supported by...

The byte packet is considered as being completed if the next byte does not arrive within the time interval (Тp) exceeding the value of the “maximum interval (Тт) + 1 ms” (Figure 9). Figure 9 This applies to both LLS sensor operation and external device operation. DESCRIPTION OF COMMANDS FOR THE BINARY COMMUNICATION PROTOCOL The message format for the binary communication protocol All the commands of the binary communication protocol have the same standardized format which is presented in Table 3. Table 3 Sequential number of the field Size of the field, byte Description The field is a...

i. One-shot data readout (06h command) This command is designed to read the current data — relative level, temperature, frequency. The sensor sends the relative level data at intervals preset in the "Minimum indication" and "Maximum indication" parameters. The data are transmitted with a lower byte ahead. Table 4 — Command format If the results of fuel level measurements are obtained during the time interval between the moment of powering on the sensor and the moment of establishing a stable measurement result (this interval may be a very few seconds for certain models), these results will...

ii. Periodic data output (07h command) This command is developed to enable the mode of periodic data output. After the command is processed, the sensor starts sending data periodically — level, temperature, and frequency — with the time interval prescribed by the 13h command. If the time interval is equal to zero, data will not be sent. The periodic data output will be terminated upon the receipt of any trusted command, reset of the processor or de-energization, unless the data output mode by default is active. The data message format is given in Table 6. The data are transmitted with a...