Scientific Ltd.

The Quick Instream Q(flow)

& Uncertainty Analysis

Calculator (QiQuac™)

The Quick Instream Q(fl ow) & Uncertainty Analysis Calculator (Qi-Quac™) is a serial datalogger designed for Salt Dilution fl ow mea-surements. The user interface assists the hydrographer by presenting a graphical representation of the conductivity over time, calculating fl ow (Q), and estimating the associated uncertainty. This ability to employ Quality Assurance / Quality Control (QA/QC) to fi eld mea-surements helps to reduce costs associated with fi eld work. This can expedite the permitting process, ensure compliance, and reduce risk associated with natural resource development.

“Over the past year I have come to depend on the QiQuac for all my fi eld trip visits. It’s accuracy, durability and compact design make it my number one tool when working on the river.  Since my introduction to the QiQuac I have performed over 150 fl ow measurements, I rely on the quick and convenient results which allow me to leave the fi eld with confi dence in my data collected.  It has become my silver bullet in the hunt for accurate spot fl ows measurements!”

— Dan Valliquette, Hydrographer

QiQuac Features

• Logs Serial EC, T, and EC.T data to internal 4GB SD Card. Currently compatible with WTW330i, WTW340i, Oakton Con110, T-HRECS EC and T instruments.

• Calculates Q (Flow) in real time.

• Calculates Uncertainty in the fi eld for QA/QC.

• Graphically displays pulse as it travels past probe.

• Waterproof, handsome, and durable.

• >8 hours of internal rechargeable battery life, or indefi nite external battery service.

QiQuac Applications:

• Works anywhere there is turbulent cross-channel or in-pipe mixing.

Accessories:

• T-HRECS™ Conductivity Instrument with High Resolution (0.001 uS/cm) to reduce Q uncertainty and/or reduce required salt dosage.

• DuckBox™ SD kit with Scales, QuickFlask™ CF.T. Calibration Equipment, and vented IP67 hard case.

The QiQuac Kit contains DuckBox, QuickFlask, Radio T-HRECS, Serial T-HRECS, QiQuac, NaCl Standard, 1ml Pipettor, 5000 g Scale, 200.00 g scale, charging cables, and spare battery.

fathomscientifi c.cominfo@fathomscientifi c.com

Scientific Ltd.The T-HRECS™sensor

The T-HRECS™ sensor is a high resolution (14 bit, or 0.001 µS/cm up to 1000 µS/cm) instrument for measuring Electrical Conductivity and Temperature. We developed the Temperature and High-Resolution Electrical Conductivity Serial device to increase the Signal to Noise Ratio (SNR) of our salt dilution measurements, thereby lowering the measurement uncertainty and/or amount of salt required. Devices are galvanically isolated, can operate independently on an exter-nal power supply, and can convert serial output to RS232, 4-20 mA, SDI-12, or Zigbee Radio (over >100m). We also off er a self-contained data logging unit with internal (4xD Cell) or external power, SD Card datalogging, and Date-Time stamp.

Why is High Resolution important? The higher information content of the signal results in a higher SNR. In the case of Salt Dilution mea-surements, this means that either less salt can be used in the mea-surement, or a lower uncertainty can be obtained.

T-HRECS Radio Instrument with 3m of probe cable, sheathing, and PVC shroud

T-HRECS SDI-12 Sensor with 10m of probe cable, sheathing, and PVC shroud

§ Units are factory calibrated from 0-1000 µS/cm, but will report values beyond this.¥ Units can be calibrated over any range, but will show drift at EC.T values beyond 1000 µS/cmψ This metric is most relevant to Salt Dilution measurements and determines the derived Q uncertainty.ł The SDI-12 bus is capable of having at least 10 sensors connected to it, each with 61m of cable. With fewer sensors, longer cable lengths are possible. Due to impedance, the maximum cable length depends on the capacitance of all cables connected to the data line. In the fi eld we used runs of up to 230 meters with three sensorsϪrequires 4 conductors for two channels, EC.T and T.*EC.T uses nlf based on EU standard 27888 at 25°C^Based on 5 second sampling rate in moderate temperatures.

T-HRECS TM5-RS232 TM5-R TM5-SDI12 TM5-DL TM5-4to20

Parameters EC, T, EC.T (nlf)

EC Resolution 0.001 µS/cm 0.015 µS/cm

EC Range§ 0 to 1000 µS/cm

EC Accuracy¥ (0-1000 µS/cm) ±1% of value(1000-2500 µS/cm) ±10% of value

EC Stabilityψ 0.01% of value

T Resolution 0.001 °C 0.002 °C

T Range 0°C to 100°C

T Accuracy (-5°C to 25°C) 0.1°C

T Stability 0.01% of value

Power 5V via Pin 7,9

Internal LiPo

9-14V 4xD-Cell 9-14V

Int. Batt. Life^ - >24 hours - >3 months -

Comms RS-232 ZigBee SDI-12 SD Card Logging

4-20mA

Comm Range 15m 100m 230 mł - 5000mϪ

T-HRECS

features:

• High resolution and stability for low conductivity measurements (0.001 uS/cm resolution and 0.01% of value stability) using Titanium or SS-304 k=0.1 electrodes.

• High accuracy in EC (1% of value), Temperature (0.1 °C) and the derived Temperature Compensated Electrical Conductivity (EC.T) (1% of value)

• Low power consumption during measurement and quiescent period.

• Accurate temperature compensation using nlf based on EU standard 27888 at 25°C

• A variety of interfaces: SDI-12, RS232, 4-20mA, ZigBee mesh, SD Datalogging

• Rugged waterproof design with nylon sheathing on Probe-Transmitter and PVC Shroud on Electrode.

• Galvanically isolated to avoid ground loops and power supply noise.

• Lightning protection and ElectroStatic Discharge (ESD) protection.

• Fast thermal response (