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
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The Stevens AxSys CCR is a
microprocessor-based instrument used for monitoring, recording and totalizing
open channel flows in water and wastewater. The unit is designed to accept
a variety of environmental sensor inputs. In flowmeter applications the instrument
is capable of converting the water gage height reading from a water level
sensor into an instantaneous flow rate value, and then accumulating the discharged
flow totals over a user specified interval. An integral 6 inch diameter
circular chart provides continuous on site recording of flow rates or any
optional parameter you want to chart. Chart speed is selectable via
an on-board switch for 6 hours, 24 hours, 7 days, and 31 days. The AxSys
CCR offers a large internal memory capacity (60,000 readings) and an even
larger memory capacity in a removable Stevens Data Card (120,000 readings),
which can be brought in from the field and read into a computer at the office.
The AxSys CCR can also be an easy functional replacement to the Stevens 61R
or 61M flowmeters by simply configuring the AxSys CCR with a float pulley
shaft assembly and mounting bracket.