Time-of-flight method
The sensor of the meter pulses in the direction of the product surface. There, they are reflected back and received by the sensor. The meter measures the time t between pulse transmission and reception. The meter uses the time t (and the velocity of sound c) to calculate the distance D between the sensor membrane and the product surface:
D = c •t/2
As the device knows the empty distance H from a user entry, it can calculate the level as follows:
L = H - D
An integrated temperature sensor compensates for changes in the velocity of sound caused by temperature changes.
Calibration
Enter the empty distance H and the span F to calibrate the device.
Blanking distance
Span F may not extend into the blanking distance B. Level echos from the blanking distance cannot be evaluated due to the transient characteristics of the sensor.
Product features
The standard remote ultrasonic level meter.
a.Standard series has 2 relays (high and low);
b.The cable between the probe and the host can be 20m at most.
The enhanced remote ultrasonic level meter.
a.Enhanced series can have 2 probes to measure 2 point’s level;
b.Enhanced series can provide 6 relays at most;
? c.Enhanced series can provide RS485 serial communication;
? d.The cable between the probe and the host can be 1000m at most;
? e.Enhanced series can be configured by “remote control”.
The difference-level measurements.
a.Difference-level series can provide two pair 4-20mA output or one 4-20mA and one RS485 output;
? b.The cable between the probe and the host can be 1000m at most;
? c.Difference-level series can be configured by “remote control”.
Technical data
The sensor of the meter pulses in the direction of the product surface. There, they are reflected back and received by the sensor. The meter measures the time t between pulse transmission and reception. The meter uses the time t (and the velocity of sound c) to calculate the distance D between the sensor membrane and the product surface:
D = c •t/2
As the device knows the empty distance H from a user entry, it can calculate the level as follows:
L = H - D
An integrated temperature sensor compensates for changes in the velocity of sound caused by temperature changes.
Calibration
Enter the empty distance H and the span F to calibrate the device.
Blanking distance
Span F may not extend into the blanking distance B. Level echos from the blanking distance cannot be evaluated due to the transient characteristics of the sensor.
Product features
The standard remote ultrasonic level meter.
a.Standard series has 2 relays (high and low);
b.The cable between the probe and the host can be 20m at most.
The enhanced remote ultrasonic level meter.
a.Enhanced series can have 2 probes to measure 2 point’s level;
b.Enhanced series can provide 6 relays at most;
? c.Enhanced series can provide RS485 serial communication;
? d.The cable between the probe and the host can be 1000m at most;
? e.Enhanced series can be configured by “remote control”.
The difference-level measurements.
a.Difference-level series can provide two pair 4-20mA output or one 4-20mA and one RS485 output;
? b.The cable between the probe and the host can be 1000m at most;
? c.Difference-level series can be configured by “remote control”.
Technical data
| Type | Standard series |
| Power supply | DC24V/AC220V |
| Display | 4 digit LCD/6 digit LED |
| Accuracy | 0.2% of full span (in air) |
| Output current | 4-20mA |
| Output load | 0-500Ω |
| Temperature range | -40℃~80℃ |
| Pressure range | ±0.1MP (press definitely) |
| Measure cycle | 1 second |
| Parameter set up | 3 induction buttons |
| Cable connection | PG11 |
| Material | ABS |
| Protect grade | IP67 |
| Fix | Hang |