Description
Matching with other liquid level sensors and transducers, QSY7511 series liquid level and capacity controller can measure and display liquid level and its volume or weight according to shape of the vessel and density of the liquid.
1, Error is less than 0.2%F.S. Functions of regulation and digital filtering are provided.
2, Functions of data recording, data analysis and failure diagnosis are available.
3, Multi-protection, isolation design, anti-interference, high realiability
4, Transforming output converts measured and transformed values to standard current and voltage for other devices.
5, Data transmission and control between computer and meter are fulfilled through transparent, high speed and efficient net communication interface.
6, Printing interface and unit with hardware clock
7, Adequate for liquid level signals of voltage, current, mV and resiatance
8, Optional shape, size, panel, digital display, LCD and light beam
9, The function of 8-sect polyline is for second modification of volume.
Standard Functions：
Input Signal |
DC, DV, mV signal, resistance |
Display Mode |
Multi displays of liquid level, volume and weight such as digital double displays, 3 displays, digital display + single light beam |
8-Segment Polyline Correction |
For modification of nonlinearity between volume and level |
Correction of Zero Point and Measuring Range |
To reduce errors from sensors and transducers. |
Alarm Output（optional） |
Max. 4-point alarm output, optional 10 alarm modes, adjustable sensitivity, delayed alarm |
Transforming Output（optional） |
Operated and corrected measuring values are converted to isolated signals of standard current and voltage for other meters and computers. Upper limit and lower limit of output of transducers can be set. |
Input Fault Treatment |
Meters will display O.L and output preset value to prevent unexpected interlock or stop resulted from misoperation if signals from sensors or transducers are error. |
Optional Output Control |
Control power of comparing output and analog output can be granted to computers or meters if communication function is available. |
Level-Volume Conversion |
The function of 8-sect polyline is adapted for calculating accurately volumes for different levels. |
Volume-Weight Conversion |
Density of liquid is given to calculate its weight. |
Digital Filtering |
To filter high frequency small amplitude interference to ensure stability and accuracy of indication. |
Communication Interface（optional） |
RS－485, RS-232, RS－422, BCD interfaces are provided. Address and rate could be set. Meter or computer could be choosed to control alarm output and transmitting output. |
Printing Interface（optional） |
Automatic, timing and alarm print are available. Optional intelligent print unit can help some meters share one printer. Internal hardware clock guarantees traveling time correctly without power supply. |
Recording（optional） |
260 thousand datum can be recorded. Interval is adjustable. |
External Power Supply（optional） |
Provide 24V, 12V DC, precise current and voltage |
Usual Nonstandard Functions：
Alarm Silencing |
Customers can press buttons on panel to silence internal or external buzzers while they are alarming. |
Power-Down Memory |
While power down, the value at the moment is saved which is displayed after power on. Customers can press buttons on panel to display current value. |
Alarm Locking |
When critical value is achieved, the alarm is output and locked. Customers must press buttons on panel to reset it. |
Max. Value Recollection |
Maximum value is saved which customers can press buttons on panel to display or clear. |
Isolated Output |
Transducers output 2 isolated signals of current or voltage to 2 devices. |
Technical Data：
（1）Technical Data
Power Supply
1, meter of 220V AC：220V±10%， dissipation less than 7VA；
2, meter of 24V DC：24V±10%， dissipation less than 5VA；
3, meter of 12V DC：9V~20V， dissipation less than 5VA
4, Other standards of power are provided in documents attached to devices.
Operating Environment：0℃~50℃， humidity less than 90%R.H. Customers must give clear indication for meters of wide range temperature while ordering.
Range of Display：-1999~9999， movable decimal point
Displaying Color： Measured value green, preset value red, light beam red, based on customers’ requests
Display Resolution：1/10000
Input Signal ： voltage, current, mV，
1, voltage：1V~5V DC，0V~5V DC optional
2, current：4mA~20mA，0mA~10mA，0mA~20mA optional
3, Other input signals or grade division must be given while ordering.
Intrinsic Error： less than ±0.2%F.S
measuring resolution：1/60000， 16-bit A/D transducer
measuring control cycle：0.2 second
Technical Data of Accessories
Alarm Output
1, 10 optional alarming modes, delayed alarm
2, Relay Output： contact capacity 220V AC，3A
3, OC Output（Requesting while ordering）： voltage less than 30V, current less than 50mA
Transforming Output
1, Photoelectric Isolation
2, optional DC Output of 4mA~20mA，0mA~10mA，0mA~20mA, load larger than 600Ω
3, DC output of 1V~5V，0V~5V，0V~10V, requesting while ordering
4, Output Resolution ：1/1000， error less than ±0.5% F.S or 1/4000， error less than ±0.2% F.S（Requesting while ordering）
Communication Interface
1, Photoelectric Isolation
2, RS-232, RS-485, RS-422 standards， Requesting while ordering
3, adjustable meter address from 0 to99
4, Optional communication rate of 2400, 4800, 9600, 19200, requesting while ordering for those lower than 2400
5, Meters receive response delay from computers: Response delay which has “#” as the delimiter is less than 500μs. Other response delay is less than 100ms.
6, Matched testing softwares provide configuration softwares and application softwares as technical support.
Printing Interface and Printing Cell：
1, Internal hardware clock which operates normally while power down and adjusts leap year and months automatically
2, 3 optional printing modes: manual, manual + timed, manual + timed + alarm
3, Contents： time（year, month, day, hour, minute），Alarms mode measured value units
4, One printing unit can only connect one meter. Intelligent printing unit is optional to realize connection between on printing unit and many meters.
5, 16-column micro printer has the same power supply with meters. If customers have any special requirement for printing, they can request it while giving an order.
Memory Unit Record Cell
1, 4Mbit capacity, 260000 datum, optional interval from 1 second to 59 minutes 59 seconds, data keeping while power down
2, Optional cyclic or noncyclical
3, reading datum through communication interface
External Power Supply
1, Ordinary Power Supply： for transducers， error less than ±5% between output value and nominal value， load larger than 50mA
2, Accurate Power Supply： for sensors of pressure and gravity， error less than 0.2% between output value and nominal value, load larger than 50mA
3, optional types of 24V DC，12V DC，5V DC or others， Requesting while ordering
Optional Specification
Contents |
Explanation |
7511/ |
Liquid level and capacity controller |
Size |
A- |
oblong160×80×125 upright80×160×125（W×H×L） |
B- |
96×96×112（W×H×L） |
C- |
oblong96×48×112 or upright 48×96×112（W×H×L） |
D- |
72×72×112（W×H×L） |
E- |
318×104×300（W×H×L）， universal for both plate and table |
Panel |
H |
oblong |
S |
upright |
F |
square |
Display Contents |
2 |
level + volume or weight |
5 |
level + light beam + volume or weight (only for A-S) |
6 |
level + volume + weight (only for A-H) |
Input Signal |
I |
current：（4～20）mA, （0～10）mA, （0～20）mA |
V |
voltage：（1～5）V, （0～5）V, （0～10）V |
M |
Range of MV signals must be given while ordered. |
R |
Range of resistance signals must be given while ordered. |
Number of Alarms |
T |
T0： no alarm;T1~T4： 1-4 point alarm |
Transforming Output |
A0 |
no output |
A1 |
Current Output（4~20）mA, （0~10）mA or（0~20）mA |
A2 |
Voltage Output（0~5）V, （1~5）V |
A3 |
Voltage Output（0~10）V |
A4 |
other outputs |
External Power Supply |
B0 |
no external power supply |
B1 |
External Power Supply of 24V DC |
B2 |
External Power Supply of 12V DC |
B3 |
external power of precise voltage |
B4 |
external power of precise constant current |
B5 |
others |
Communication Interface |
S0 |
no communication interface |
S1 |
RS-232 Interface |
S2 |
RS-485 Interface |
S3 |
RS-422 Interface |
Power Supply for Meter |
V0 |
220V AC |
V1 |
12V DC |
V2 |
others |
Printing |
P |
Printing supported， non essential |
Memory Unit |
R |
with memory unit， non essential |
Nonstandard Function |
N |
nonstandard functions。 non essential |
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