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Valeport 801 EM - User Manual

Valeport 801 EM
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This document was prepared by the staff of Valeport Limited, the Company, and is the property of
the Company, which also owns the copyright therein. All rights conferred by the law of the
copyright and by virtue of international copyright conventions are reserved to the Company. This
document must not be copied, reprinted or reproduced in any material form, either wholly or in
part, and the contents of this document, and any method or technique available therefrom, must
not be disclosed to any other person whatsoever without the prior written consent of the
Company.
Valeport Limited
St Peters Quay
Totnes
Devon, TQ9 5EW
United Kingdom
As part of our policy of continuous development, we reserve the right to alter, without prior
notice, all specifications, designs, prices and conditions of supply for all our equipment.
0801852a
08 August 2016
+44 1803 869292
sales@valeport.co.uk
www.valeport.co.uk
Tel:
e mail:
Web:
Model 801 EM
Current Meter
Operating Manual

Table of Contents

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Summary

1. Introduction

2. Equipment

2.1. Standard 801 System Components

Describes the standard 801 system sensors, wading rods, and other essential components.

2.2. Wading Operation Accessories

Lists accessories specifically for wading operations, including rods and carrying bags.

2.3. Optional System Configurations

Details optional accessories that enhance the system's functionality, such as data cables.

3. Device Description and Operation Modes

Fixed Averaging Mode

Explains the Fixed Average mode where the unit performs one average over a set period.

Free Running Averaging Mode

Details the Free Running mode, which is fixed average with automatic restart of averaging periods.

Moving Averaging Mode

Describes the Moving Average mode where the average is updated every second.

4. System Operation and Configuration

4.1. Initial System Setup Procedure

Provides step-by-step instructions for preparing the system for use, including battery insertion and connections.

4.2. Powering On the Unit

Explains the procedure for switching the unit on and the initial display shown.

4.3. Running the Flow Meter

Details how to operate the unit in different averaging modes after initialisation.

4.4. Setting Units, Averaging Mode and Period

Guides the user on configuring units, averaging modes, and the averaging period.

4.5. Accessing the Option Menu

Describes accessing the Option Menu to configure logging, beeper, and backlight settings.

4.6. Using the Logging Menu

Explains how to access the Logging Menu for managing recorded data, setting date/time, and extracting data.

4.7. Sub Options Menu Configuration

Covers accessing Sub Options for direct EM communications and setting frequency/alarm outputs.

4.8. Analogue Output Functionality

Details the analogue output functionality, including voltage and current sink options.

5. Power Supply Management

5.1. Battery Replacement Guide

Instructs on how to access and replace the batteries in the Control Display Unit.

5.2. Battery Life Expectations

Provides information on current consumption and expected battery life under different operating conditions.

5.3. External DC Power Connection

Explains the operation and connection details for the optional external DC power supply.

6. Calibration Procedures

6.1. Adjusting the Zero Offset

Details the procedure for adjusting the unit's zero offset calibration.

7. Care and Maintenance Practices

Summary

1. Introduction

2. Equipment

2.1. Standard 801 System Components

Describes the standard 801 system sensors, wading rods, and other essential components.

2.2. Wading Operation Accessories

Lists accessories specifically for wading operations, including rods and carrying bags.

2.3. Optional System Configurations

Details optional accessories that enhance the system's functionality, such as data cables.

3. Device Description and Operation Modes

Fixed Averaging Mode

Explains the Fixed Average mode where the unit performs one average over a set period.

Free Running Averaging Mode

Details the Free Running mode, which is fixed average with automatic restart of averaging periods.

Moving Averaging Mode

Describes the Moving Average mode where the average is updated every second.

4. System Operation and Configuration

4.1. Initial System Setup Procedure

Provides step-by-step instructions for preparing the system for use, including battery insertion and connections.

4.2. Powering On the Unit

Explains the procedure for switching the unit on and the initial display shown.

4.3. Running the Flow Meter

Details how to operate the unit in different averaging modes after initialisation.

4.4. Setting Units, Averaging Mode and Period

Guides the user on configuring units, averaging modes, and the averaging period.

4.5. Accessing the Option Menu

Describes accessing the Option Menu to configure logging, beeper, and backlight settings.

4.6. Using the Logging Menu

Explains how to access the Logging Menu for managing recorded data, setting date/time, and extracting data.

4.7. Sub Options Menu Configuration

Covers accessing Sub Options for direct EM communications and setting frequency/alarm outputs.

4.8. Analogue Output Functionality

Details the analogue output functionality, including voltage and current sink options.

5. Power Supply Management

5.1. Battery Replacement Guide

Instructs on how to access and replace the batteries in the Control Display Unit.

5.2. Battery Life Expectations

Provides information on current consumption and expected battery life under different operating conditions.

5.3. External DC Power Connection

Explains the operation and connection details for the optional external DC power supply.

6. Calibration Procedures

6.1. Adjusting the Zero Offset

Details the procedure for adjusting the unit's zero offset calibration.

7. Care and Maintenance Practices

Overview

  1. Function Description
  2. Important Technical Specifications
  3. Usage Features
  4. Maintenance Features

The Valeport Model 801 EM Current Meter is an electromagnetic flow meter designed for measuring water flow. It utilizes the Faraday principle to determine flow past the sensor. Two types of sensors are available for the 801: a cylindrical sensor and a flat sensor, each suited for different applications.

Function Description:

The 801 EM Current Meter measures water flow by sensing the movement of water past its electrodes. The system measures flow twice per second, calculating real-time flow every second as the average of these half-second readings. The real-time display is updated every second. Average speeds are computed as the average of the one-second real-time values over a user-defined averaging period, which can be up to 600 seconds. The system operates in any conducting fluid, and its calibration is not affected by conductivity, though very low conductivities may result in noisier signals. The unit is designed to measure speeds up to 5 M/sec in both positive and negative flow directions.

The system's calibration is a combination of the sensor and the Control and Display Unit (CDU) electronics. The serial numbers of both the probe and the CDU are displayed upon startup. The 2Hz data from the EM system is digitally filtered from raw 96Hz data using a Digital FIR filter with a fixed time delay and no frequency-dependent phase shift. The filter's -3dB cut-off is 0.61Hz, and the delay time is 4.0 seconds.

Important Technical Specifications:

  • Sensor Types:
    • Flat Type (0801001): Electrodes on one surface, sensing volume is a cylinder extending approximately 10mm above the sensor. Suitable for shallow applications.
    • Cylindrical Type (0801002): Electrodes on the side, sensing volume is a spherical volume around the sensor with a diameter of about 120mm. Not recommended for use when water boundaries (bottom, sides, or surface) are closer than 40mm to the sensor.
  • Measurement Range: Up to 5 M/sec in both directions.
  • Data Output Rate: 2Hz for real-time flow, updated every second.
  • Averaging Period: Up to 600 seconds.
  • Digital Filter: Digital FIR filter, -3dB cut-off at 0.61Hz, 4.0 seconds delay time.
  • Power Supply: 8 x 1.5V C type alkaline cells (internal).
  • Battery Life (Alkaline cells, 15°C, 5 min On / 1 min Standby duty cycle):
    • Backlight Off: 28.33 hours (actual on time), 91% duration to low battery.
    • Backlight On: 17.08 hours (actual on time), 75% duration to low battery.
  • External Power (Factory Fit Option): 7 to 15 VDC input.
  • Analogue Output (Factory Fit Option): +/-5V for +/-5 M/sec speed range, or 4-20mA.
  • Data Interface: RS232 for PC connection (4800 baud, 8 data bits, 1 stop bit, no parity, no flow control).
  • Logging Capacity: Up to 999 averages.
  • CDU Immersion: Designed for operation in rain and temporary immersion in water up to 0.3m for 10 seconds (with all connectors/pro-caps fitted).

Usage Features:

  • Setup: Requires cleaning probe electrodes, inserting batteries (if external power not used), and connecting cables. For wading rod use, the probe is fixed into an adaptor and attached to rods.
  • Switch On: Pressing the ON button activates the unit, accompanied by a beep. The unit displays system information (model, version, serial numbers) upon startup.
  • Run Modes:
    • Fixed Average: Performs one average over the set period, then stops and displays the average and standard deviation (SD). Requires pressing START for a new period.
    • Free Running: Fixed average with automatic restart. Displays and holds the previous period's average and SD during the subsequent period until updated.
    • Moving Average: Calculates average and SD over the set period, updated every second. Display freezes at the last average when STOP is selected.
  • Standard Deviation (SD): Calculated from real-time samples during the averaging period, indicating measurement quality and flow variability.
  • Units: User can toggle between metres per second (M/SEC) and feet per second (FT/SEC).
  • Averaging Period Adjustment: Allows setting the averaging period in seconds (1's, 10's, 100's) up to a maximum of 600 seconds.
  • Logging: Can store up to 999 records. Users can switch logging on/off, view stored data, extract data to a PC, or erase memory.
  • Date/Time Setting: Internal clock can be adjusted for accurate time stamping of recorded data.
  • Beeper: Audible indication (once per second) that measurements are being made, can be toggled on/off.
  • Backlight: Display backlight can be toggled on/off, affecting battery life.
  • Low Battery Indicator: "LOW BATT" message appears when approximately 4 hours of battery life remain (with backlight).
  • Data Extraction: Stored data can be uploaded to a PC as a text file with "Tab" delimiters, suitable for spreadsheets.
  • Calibration Adjustment: Users can adjust the zero offset and gain factor via a PC terminal interface. The system outputs EM data at 2Hz in calibrated (CAL) or raw counts (NOCAL) mode.

Maintenance Features:

  • Battery Replacement: 8 "C" cells are housed in a compartment at the bottom of the CDU. Access is gained by unscrewing a central retaining screw and pulling out the end cap and PCB assembly. Labels indicate correct cell insertion.
  • Probe Cleaning: Electrodes should be cleaned to remove grease or dirt.
  • Calibration: While calibration is generally for life, check calibrations are advisable annually. The system's calibration involves three parts: Hydro Calibration (shape of the curve), System Gain Factor (specific to sensor/CDU combination), and System Zero Offset (counts at zero flow). These can be read and altered via a PC interface.
  • Zero Offset Adjustment: A procedure is provided to determine and set a new zero offset based on readings in still water or raw real-time counts.
  • General Care: The instrument is designed for field use but requires care to prevent damage to the sensor, cable, or CDU.

Valeport 801 EM Specifications

General IconGeneral
BrandValeport
Model801 EM
CategoryMeasuring Instruments
LanguageEnglish

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