Instrumentation Division was originally established in 1965, which was expanded by creating Hydraulic Instrumentation Centre under UNDP aid in 1976, and the division is now known as HI division. Under Hydraulic Machinery and Cavitation division, Volumetric Calibration Laboratory was established in 1968 with UNDP aid. Current Meter Calibration facility was established in 1956 and upgraded in 2003 with the latest instrumentation.
Major activities undertaken by various technical divisions in this group are summarized below:
- Instrumentation for collection of data on physical hydraulic models, such as current meters, water level recorders, various types of transducers, signal conditioners, multi- channel data acquisition systems, etc.
- Instrumentation for field data collection on coastal parameters like water level, velocity, wave-height and period, temperature, salinity, depth of water, tides, tidal currents, waves, flow pattern, water samples, thermal mapping, beach samples, etc.
- Computer controlled servo-hydraulic Random Sea Wave Generation (RSWG) systems for wave flumes and basins
- Computer based electro-servo automatic tide generation (ATG) system for tidal models
- Dam Instrumentation for measurement of tilt, settlement, deformations, pore- water pressures and uplift, internal stress, etc.
- Collection and analysis of field data for waves, water levels, currents, temperature, salinity, bathymetry, water quality and sediment characteristics
- Calibration of flow meters and evaluation of performance of valves
- Performance evaluation and tests for voltage fluctuations on bore well pumps
- Assessment of head loss across filters
- Optimisation of pumping system design by water hammer analysis
- Flow measurements for water auditing and assessing the performance of hydropower projects
- Verifying the design of pump house chamber with reference to flow pattern, flow distribution, vortex, etc. and suggesting remedial measures
- Servicing and Calibration of conventional rotating element type current meters like cup type, propeller type, pigmy cup, pigmy propeller types conforming to IS 13371/ ISO 3455
- Calibration of sophisticated stationary element type electromagnetic and acoustic current meters
CURRENT METER RATING TROLLY
SALIENT FEATURES OF RATING TROLLEY
v Rating tank 228 m long, 3.66m wide and 2.13m deep
v Electrically driven rating trolley (carriage)
v Speed range 0.01 m/s to 6.0 m/s.
v AC servo motors and drives with PLC for precise speed control .
v PC based data acquisition and processing system using specially developed software .
v Evaluation of drag force / hull resistance on water bodies.
v Servicing and repairs of old current meters .
v Calibration of conventional rotating element type current meters (IS 13371/ ISO 3455) and sophisticated stationary element type electromagnetic and acoustic current meters used in oceanography.
Calibration of current meters in straight open tank (rating tank) is an internationally accepted practice. A new current meter is required to be calibrated so as to establish relationship between its rotational speed and the velocity of flow. Even for old current meter periodical calibration is necessary to account for possible wear and tear of its certain parts. As per IS 13371 it is mandatory to recalibrate the current meters at yearly interval or after 300 hrs of use whichever is earlier During calibration, the current meters are suspended from the carriage and drawn through still water containing in the tank at a number of steady speeds of the trolley. Simultaneous measurements of the speed of the trolley and the rate of revolution of rotor of the current meter are made. The two sets of values are related by one or more equations. The calibration of each current meter is provided in the form of Calibration Table suitable to gauging technique in use.
v Central Water Commission
v Central and State Government Departments
v Current meter manufacturers