The Massa Ultrasonic Ranging Module is a precision electronic measurement device which includes an interface electronics module and one or two ultrasonic transducers, depending on the model selected. The ranging module provides the OEM with a PWMLATCH output pulse, whose duration is proportional to the time required for the sound to travel between the transmit and receive transducers. The LATCH pulse width may be processed through additional circuitry for applications requiring position, level, profile, or thickness measurements.

Internally or externally triggered, target distance ultimately limits the maximum pulse repetition rate. A maximum rate of 150 Hz is possible when targets are less than one foot distant; refer to individual module specifications for rep rate limits. For internal triggering, the pulse repetition rate is set via a single external resistor.

The E-201B Series utilizes two transducers, one to transmit and one to receive acoustic pulses. This arrangement allows them to be mounted side-by-side for an echo ranging application, or mounted opposing one another for high speed counting or accurate measurements at over twice the range possible with echo ranging. Two transducer echo-ranging configurations also provide shorter minimum target distances, required for certain applications.

The E-220B Series utilizes a single transducer for both sending and receiving acoustic pulses. This arrangement is ideal for applications where a limited area is available for mounting the sensor. Minimum target distance is slightly farther than two-transducer configurations.

Optional transducer mounting brackets provide for easy adjustments to sensor alignment during installation and have been specifically designed to minimize crosstalk between paired transducers (E-201B).

Request Massa's Application Guide To Ultrasonic Sensing for a comprehensive review of application considerations.

Applications

  • Ultrasonic Micrometer

  • Non-contact Profile Gauge

  • Precision Limit Switch

  • Thickness Unifomity Control

  • Precision Proximity Detection

  • High Speed Counting


Features

  • Remotely Mounted Sensors

  • Resolution to +/- 0.010 inches

  • Single Supply Operation

  • Low Current Drain

  • Internal or External Trigger

 

Ultrasonic Ranging Module Product Selection Guide

Individual Specifications

Model Number
E-201B/215
E-201B/150
E-220B/215
E-220B/150
E-220B/40
E-220B/26

Transducers Supplied
Two
Two
One
One
One
One

Detection Range1
 Echo Ranging
 Opposed Alignment2

3"-24"
3"-48"

5"-60"
5"-120"

4"-24"
N/A

8"-60"
N/A

2'-20'
N/A

2'-30'
N/A

Resolution:
 Instantaneous3
 Averaged4

0.03"
0.2%

0.04"
0.1%

0.03"
0.2%

0.04"
0.1%

0.3"
0.1%

0.4"
0.1%

Beam Angle5,6
10
10
10
10
15,35
15,35

Transducer Frequency
215 kHz
150 kHz
215 kHz
150 kHz
40 kHz
26 kHz

Maximum Pulse Rate
150 Hz
100 Hz
150 Hz
100 Hz
25 Hz
20 Hz
Notes:
1- Nominal values at ambient temperature, pressure and humidity;
2- One transducer affixed to each of two objects, then aimed at each other;
3- Conservatively rated, improved dramatically with constant, controlled environment;
4- Percent of range; averaging processed externally, typically using a computer or PLC;
5- Total width at -3 dB points, no secondary lobes exist with /150 & /215 transducers;
6- Detachable horn supplied with /40 & /26 transducers provides smaller beam angle (required for maximum range).
General Specifications

Output Pulse Width (LATCH)1

 Echo Ranging 147.5 usec per inch (or 1.77 msec per foot) of target distance

 

Opposed Alignment 73.75 usec per inch (or 0.89 msec per foot) of sensor separation)

External Trigger Pulse Width

 Optionally Required 180 +/- 10 uSec

Digital Output (LATCH) Sink Current

 N-Channel MOSFET 30 mA @ Vds=0.5 V

Voltage Requirements


 Limits
Recommended		 8 to 15 V DC
12 V DC

Power Requirements (Nominal)


 20 mA @ 8 V DC
30 mA @ 15 V DC		 160 mW
450 mW

Temperature Range2


 Operating
Storage		 0 to 60 C
-25 to 85 C

Humidity


 Non-condensing 0 to 90%

Transducer Construction


 Sealed Housing
Standard Housing		 /215 & /150 Models
/40 & /26 Models

Weight

 Electronics & Transducers  4 to 8 oz.

Transducer Cable Lengths


 With Connectors 2 ft., 6.5 ft. & 16 ft.

Notes:
1- When ambient temperature is 20 C;
2- When ambient temperature exceeds 50 C, E-220B series modules operating at 12 V DC input will require a 75 kOhm resistor between the TRIG IN and GND pins. Minimum sensing range will increase (move out) by approximately 5%. Please contact factory for additional information.

Ordering Information

Specify the part number which corresponds to both the model number and transducer cable length desired. Specify the optional mounting bracket part number as listed for each model number.

Model Number

2 ft. Cable

6.5 ft. Cable

16 ft. cable

Mounting Bracket

E-201B/215

200344-501

200344-502

200344-503

200359-1

E-201B/150

200343-501

200343-502

200343-503

200362-1

E-220B/215

200374-501

200374-502

200374-503

200358-3

E-220B/150

200373-501

200373-502

200373-503

200358-2

E-220B/40

200355-502

200355-505

200355-506

200358-1

E-220B/26

200355-501

200355-503

200355-504

200358-1

Functional Block Diagrams

Timing Diagram


Circuit Connections

Physical Dimensions
Mounting Brackets

Transducers

Electronics Module

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