Wireless Pressure Monitoring with Transient Waveform Capture
The Telog PR-32i is a versatile instrument intended to monitor water system pressures or water levels (e.g. underground aquifers, surface reservoirs or water tower levels). It is available with a choice of pressure sensor ranges, from 1 to 500 PSI and cable lengths up to 500 feet.
In addition to performing the measurement and recording functions of the standard Telog PR-32 pressure recorder, the impulse recording option feature of the Telog 32i units stores the waveform of captured pressure transients and water hammer events. The Telog PR-32i can store up to 100 events of variables duration that may occur over many months of on-site monitoring, monitoring up to a maximum of 15 minutes of transient data at 32 samples/second.
You can configure the Telog PR-32i to call its host application on a schedule (e.g. once per day; every four hours, etc.) and/or on alarm (e.g. in response to a high or low pressure or level exceedance condition). The recorder can sample the pressure sensor up to 4 times/second and store the data statistics (min, average, maximum or totals) at user defined intervals (e.g. five minutes, one minute, etc.). Data loss is not a concern because the recorder stores over 80,000 interval statistics before overwriting the oldest data with new.
The Telog PR-32i uses a Telog proprietary, low power m2m cellular modem certified for operation on the Sprint, Verizon Wireless and Bell Canada cellular networks in North America and various cellular carriers internationally. The cellular modem, antenna, pressure signal conditioning, data recorder and battery are integrated into a small, environmentally rugged package making the Telog PR-32i easy to install and put into service.
The recorder operates up to five years making on average two calls per day from its user replaceable ‘D’ cell lithium battery.
Telog Enterprise and Telogers for Windows host application software support the Telog PR-32i. However, Telog also offers a Data Hosting Service for users who prefer to outsource the computer data collection and management tasks providing end-use information on a secure website.
Model: Telog PR-32i
Type: Single channel pressure recorder
Resolution: 12 bits (0.025%)
Accuracy: ±0.075% of full scale at 23°C; ±75 ppm/°C
Temperature range: -40°C to +65°C
-- Impulse Off (Normal)
--- Sample rate: 4 per second to 1 per 8 hours; programmable
--- Clock accuracy: 0.01%
--- Memory size: 128 kbytes; 80,000 data values
--- Storage method: Wrap around (first-in; first-out)
-- Note: Normal mode operates as specified above when impulse mode is on or off.
--- Data Recorded: Normal mode interval data plus transient event waveforms including pre and post transient even data, user configurable.
--- Transient Trigger: Pressure rate-of-change; either positive or negative; user configurable
--- Impulse Memory: Up to 100 transient events to a maximum of 37,000 samples after which new data will overwrite oldest data.
-- Local: RS-232, 4 pin circular connector rated IP-67; Auto-selected baud rate to 19.2K
-- Cellular: Internal Telog WM/C cellular modem 1xRTT via CDMA; certified on Sprint, Verizon Wireless and Bell Canada
-- Factory installed single 3.6V Lithium D cell; Saft LSH 20 or Equal, user replaceable
-- Life: 4000 data calls to host Computer
-- Examples: 5 years @ 2 calls/day | 1 year @ 10 calls/day
-- Size: 6.30 x 3.2 x 2.2 inches; LxWxH
-- Weight: 2 lbs.
-- Material: Polycarbonate
-- Temperature: -40 to 70º C
-- Rating: NEMA 4x (IP66)
Model: Telog PT-30b
Type: Strain gauge pressure sensor
-- Selectable 1, 2.5, 5, 10, 15, 30, 50, 100, 200, 300, 500 PSI
-- Non-linearity: ±0.15% of span; BFSL
-- Repeatability: ±0.03% of span; BFSL
-- Hysterisis: ±0.03% of span; BFSL
-20°C to 60°C
-- ±0.02%/°C (0 to 30°C)
Pressure Over Range
-- Proof pressure: 4 X full scale up to 5 PSI ranges; 3 X for higher ranges
-- Pressure fitting: 1/4NPT female with depth nose cone
-- Environmental: Submersible to NEMA 6P (IP-68)
-- Sensor length: 4.5”
-- Sensor diameter (max): 1.0”
-- Sensor body material: 316 stainless steel
-- Cable: Vented Polyurethane 0.275” diameter
-- Cable weight: 41 g/m (0.027 lbs./ft)
Monitoring Progress: Nailing Down Water Hammer And Its Implications
By Telog, A Trimble Company
If you don't know what a water hammer is, well, that's a big part of the problem. It's an all-too-frequent issue for water systems everywhere, striking in pipelines that are growing more susceptible to failure as they age.