YSI WaterLOG Shaft Encoder Water Level Instrument (H-3301/11/42)

YSI WaterLOG Shaft Encoder Water Level Instrument (H-3301/11/42)

Designed specifically for measuring water level in a stilling well, the Shaft Encoder Series (H-3301/3311/3342) sturdy design incorporates the use a float and pulley to produce accurate data within minutes of installation. Now, with the use of magnetic sensors, the WaterLOG Shaft Encoder features minimize static sensitivity for enhanced performance. You'll enjoy the easy to read, ultra low power, built-in LDC display allowing you to view the last measured value at any time. And this series is compatible with most data loggers, to allow easy installation. With three models to choose from, you can be sure to get a Shaft Encoder that has all the features you are looking for and more.

  • Features
  • Specifications

The WaterLOG® Shaft Encoder Series (H-3301/3311/3342) was designed specifically for Stilling Well water level measurement. It's simple and sturdy design produce accurate data without taking up a lot of space, making the Shaft Encoder attractive for just about every water level site.


  • 200 counts per revolution (SDI-12 output)
  • Threaded shaft compatible with older mechanical pulleys
  • Accuracy is 0.3048 cm (0.01 ft)
  • SDI-12 address and stage offset programmed using adjustment knob
  • Precision dual bearing with low temperature lubricant
  • SDI-12 and quadrature outputs
  • LCD display (3311 only)


  • Non-contact optical encoder preserves correct position even if the power is lost
  • 65,536 counts per revolution
  • Accuracy is 0.0073152 cm (0.00024 ft.) 0.3048 m (1 ft) diameter pulley
  • Max turns =±32,768
  • Zero backlash
  • SDI-12 and 4-20 mA output
Performance H-3301/H-3311 H-3342
Accuracy 3.048 mm (0.01 ft) 0.073 mm (0.00024 ft)
Resolution 200 counts/rev (SDI-12) 100 counts/rev (quadrature) 65,563 (16-bit) counts/rev
Rotation Max Turns: Unlimited Max Speed: 20 rev/sec Max Turns: ±32,768 rev Max Speed: 15 rev/sec
Offset Adjust SDI-12 or front panel adjust. SDI-12 or front panel adjust
Display 6 Character Display (H-3311 only) 6 Character Display
Main Unit Size 13.35 cm W (5.25 in)
Base Plate Size 101.6 mm L x 177.8 mm W x 107.95 mm H (4.0 in L x 7.0 in W x 4.25 in H)
Standard Shaft Size 450.85 mm L x 0.79375 mm Dia
24 threads per in x 19.05 mm (1.25 in L x 5/16 in Dia
24 threads per in x 0.75 in)
*With setscrew flat
Optical Smooth Shaft Size 450.85 mm L x 0.79375 mm Dia
(1.75 in L x 5/16 in Dia)
Material Anodized aluminum
H-3342 Turn Count Battery Type: CR-1/3N (3.3V, 160mAh, lithium) Lifetime: 10 years
Transient Protection 5.0 V Transguard
Starting Torque 0.15 oz-in typical 0.50 oz-in max over temperature
Cable Amphenol MS3106A14S-6S 6-pin female military connector
Bearing Double ball bearing with external seal
Power Requirements
Voltage Input 10.0 to 30.0 volts DC
Current H-3342 Standby: 150 μA typical Active: 40 mA typical
Current H-3311/H-3301 Standby: 800 μA typical Active: Less than 2.0 mA
SDI-12 Output Data Parameters
Output Voltage Levels

High: 3.5 volts (Min)

Low: 0.8 volts (max)

Maximum Cable Length: 250 ft (76.2 m)

Baud Rate 1200
4-20mA Output Data Parameters
H-3342 Type 4-20 mA, optically isolated
Loop Voltage 8.0V min, 35 V max
Resolution 4 μA (12-bit DAC)
Quadrature Output
H-3301/H-3311 Open drain

5.0 V transguard

General Specifications
Operating Temperature -40 ° to +60 ° C
Storage Temperature -50 ° to +70 ° C
Humidity 0 to 100%
Cable Amphenol MS3106A14S-6S (6-Pin female)
Warranty The WaterLOG® Shaft Encoder Series (H-3301/11/42) is warranted against defects in materials and workmanship for twenty-four months from date of shipment.

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