Hach 911, User Manual

Page: 5 / 103

3
Section 1 Specifications
Specifications are subject to change without notice.
Table 1 911 Flow Meter Specifications
General
Certification cCSAus Approved for Class 1 and Division 1, and Group C
Dimensions 16.5 cm dia. x 57 cm L (6.5 in. x 22.5 in.) with 12 amp battery
Weight 8 kg (17.5 lb) with 12 amp hour battery pack
Enclosure Material PVC
Enclosure Rating NEMA, 6P (IP67)
Operating Temperature –18 to 60 °C (0 to 140 °F)
Storage Temperature –40 to 60 °C (–40 to 140 °F)
Power Source 12 amp hour battery pack
Battery Life
90 days typical with a 15 minute recording interval. Assumes data download once per week,
at 10 °C (50 °F), also affected by site conditions.
User Interface Optically Isolated Interface to IBM compatible PC
Monitoring Intervals 1, 2, 3, 5, 6, 10, 12, 15, 20, 30, and 60 minutes
Program Memory Non-volatile, programmable flash, can be updated via RS232 port
Time Based Accuracy ±1 second per day
Unit Measurements
Level: in., m, cm, ft
Flow: gps, gpm, lps, lpm, lph, mgd, afd, cfs, cfm, cfh, cfd, m
3
s, m
3
m, m
3
h, m
3
d
Totalized Flow: gal, ft
3
, acre-ft, L, m
3
Data Storage
Capacity: 400 days of 1 level reading and 1 velocity reading at a 15 minute recording
interval.
Data Types: Level and Velocity
Storage Mode: Wrap or Slate
Communications
Serial connection via optically isolated interface to IBM compatible computer with Sigma
analysis software.
Submerged Area/Velocity Sensor
Velocity Measurement
Method: Doppler Ultrasound Twin 1 MHz piezoelectric crystals
Typical Minimum Depth: 2 cm (0.8 in.)
Zero Stability: 0.015 m/s (<0.05 ft/s)
Accuracy: ± 2% of reading
Recommended Range: –1.52 to 6.10 m/s (–5 to 20 ft/s)
Depth Measurement
Method: Pressure transducer with stainless steel diaphragm
Accuracy (static)
1
:
±0.16% full scale ±1.5% of reading at constant temp (± 2.5 °C)
±0.20% full scale ±1.75% of reading from 0 to 30 °C (32 to 86 °F)
±0.25% full scale ±2.1% of reading from 0 to 70 °C (32 to 158 °F)
Velocity-Induced Depth Error: Compensated based on pipe geometry and flow velocity.
Depth Range:
Standard: 0–3 m (0–10 ft); Extended: 0–9 m (0–30 ft)
Submerged Area/Velocity Sensor (continued)
Air Intake Atmospheric pressure reference is desiccant protected.
Operating Temperature 0 to 70 °C (32 to 158 °F)