CATALOG INDEX
BY ALPHABETICAL
ORDER

CATALOG INDEX
BY DEPARTMENT

For more info:
JSi@jsits.com

- [ AXSYS Datalogger ]
- [ Levelogger Series ]
- [ Pressure Transducers:
SDI Depth Sensor ]
- [ Pressure Transducers:
Submersible Depth
Transmitter II ]
- [ Type A-71 Chart
Recorder ]
- [ Type F Water Level
Recorder ]
- [ Unidata 6541 Precision
Water Level instrument ]
- [ Water Level Meter ]

TYPE A-71 CHART RECORDER

The Type A-71 Chart Recorder was first introduced in 1911, and has been improved and perfected over the years. Today it is still the worldwide standard in quality and reliability for river hydrography and other installations where long-term operation is required.

The A-71 is a float-operated recorder that provides a permanent, long-term graphic record of water-level fluctuations. A clock movement controls the rate at which a strip chart is advanced. The rise and fall of the float moves a marking stylus laterally across the chart. The stylus will reverse at each margin so that any range of water level can be accommodated.

Convenience

The A-71 Recorder uses a strip chart and pen marker to provide a permanent on-site record of water-level fluctuations. Both metric and English models are available. The A-71 Recorder stands on a three-legged cast metal base, and has an ABS plastic cover with a full-face gasket and a clear viewing port. Double-jointed hinges permit maximum cover movement for servicing in cramped quarters. Key-shaped hasps ensure secure closing and easy release of the cover, even with gloves on.

Telemetry and Data Logging Options

The Type A-71 Recorder may be used with the Stevens data loggers such as the AxSys MPU, GS-98, or Pulse Logger,. The AxSys MPU with A/F Encoder offers a convenient, cost-effective way of getting water-level data in a computer-compatible format, and it does so without disrupting the chart recording function.

The Stevens Pulse Generator or A/F Encoder can be attached to a Stevens Type A-71 Recorder to transmit pulses to the Stevens AxSys MPU for data logging or real-time transmission of water-level information via telephone, radio, or direct wired link.

Specifications

• Chart Drive Options:
  - Quartz Multispeed Timer (6 months battery)
  - 4-1/2 or 6 month negator spring-driven clock
  - Weight driven clock
  - Cramer Synchronous Motor Drive for 115 V, 60 Hz or 240 V, 50 Hz
• Float Pulley Options:
  - 375 mm or 18 in. circumference for beaded float line or perforated tape
  - 750 mm or 36 in. pulley ring for beaded float line or perforated tape
• Operating Temperature:
  - -20 to +160 F (QMT with Alkaline D Cells)
  - To -40 F ( lead acid battery or negator spring)
• Float Line/Tape Options:
  - Stainless steel cable, 125 mm or 6-inch bead spacing
  - Stainless steel tape, 125 mm or 6-inch perforation spacing
• Recommended Float Sizes (Diameter):
  - 203 mm/8 in, 254 mm/10 in.,
  - 305 mm/12 in., 356 mm/14 in.
• Size:
  - 16-1/2 x 25-1/8 x 17 (HxWxD) with cover in open position
• Shipping Weight:
  - 45 pounds
• Chart:
  - A-25 metric A-10 English

Features:

• Provides unlimited range in stage
• Easy field change of chart speed and recording ratio
• Up to 6 months of unattended operation
• On-site chart recording with telemetry options
• Adapts to newer electronic systems
• Digital encoders or analog 4-20 mA devices can be added
• Available Electro Chart Drive for mercury manometer replacement applications
• AxSys MPU adds telmetry, data logging and control capabilities