Wednesday, May 30, 2018

Bidirectional Insertion Turbine Meters Solve Municipal Water Transfer and Usage Problem

Municipal water diagram using insertion turbine flowmeters.
Municipal water system diagram.

Accurate and cost effective flow monitoring for municipal water inventory control. Because of their wide geographic coverage and large amount of reservoirs and pump stations, the water utility needed to account for water moving between many user systems. Because of the movement of water back and forth, a bi-directional solution was needed.

System Requirements:
  1. Flowmeters were for use in 62″, 60″, and 36″ lines.
  2. Needed to be bi-directional to account for system usage.
  3. Needed to provide a “split” 4-20 mA output signal with 12 to 4 mA representing reverse flow and 12 to 20 mA representing forward flow (this was a requirement of their DCS system).
  4. Flowmeter portion of system had to be capable of immersion in a flooded pit (electronics to be located remote).
  5. Output from flowmeter was required to transmit over 500′ without any signal conditioning.

Hoffer HP Series bi-directional insertion flowmeter
Hoffer HP Series bi-directional insertion flowmeter.
Bi-directional, adjustable insertion turbine flowmeters (from Hoffer Flow Controls) were provided. Each meters included a 2″ rotor in order to obtain repeatable flow rates as low as .25 FPS. The flowmeters are equipped with 2 magnetic pick up coils oriented 90 electrical degrees from each another. All outputs were sent to a remote Flowstar Model 2000 which included the quadrature bi-directional detection feature and a split 4-20 mA signal, used to detect forward or reverse flow rate.

Why Hoffer had the advantage: 

The customer first considered (2) Annubar flowmeters back-to-back, one for forward and one for reverse flow measurement. This approach would have also required a flow switch to detect flow direction. Cost and complexity were big concerns. Consideration of a turbine flowmeter system offered a much simpler and less costly solution. Here's what it came down to:
Hoffer Flowstar flow computer
Hoffer Flowstar flow computer.
  • A single Hoffer flowmeter was usable for bi-directional flow measurement.
  • A Hoffer flow computer provided a split 4-20 mA signal representing both forward and reverse flow rate.
  • A Hoffer flow computer could provide linearization over the wide repeatable flow range provided by the insertion meter. This was critical because flow rates were low relative to the line size.
  • The Hoffer flowmeter was water tight, allowing for the possibility of flooded pits.
  • The Hoffer flowmeters are the adjustable type, and are installed through an isolation valve to allow user to service the flowmeters when necessary.

The use of Hoffer HP Series bi-directional insertion flowmeters provided the user economical flow rate/flow total information that efficiently enabled the water utility to manage the potable water throughout the system.

Saturday, May 12, 2018

9 Reasons to Use Temperature Transmitters Over Direct Wiring

Temperature transmitter
Temperature transmitter
(Moore Industries)
  1. Protect Signals From Plant Noise - Convert a sensor’s “weak” low-level signal to a high-level, RFI/EMI resistant signal that will accurately withstand long distance transmission through a noisy plant.
  2. Reduce Hardware Costs and Stocking Requirements - Convert RTD, T/C, mV, and ohm signals to a standard 4-20mA output. You can standardize on (and stock) inexpensive 4-20mA DCS and PLC input cards.
  3. Stop Ground Loops - Inherent input/output/power signal isolation protect against signal inaccuracies caused by ground loops. In place of costly isolated T/C and RTD DCS/PLC input cards, you can use far-less-expensive 4-20mA cards.
  4. Cut Wiring Costs - Fragile sensor extension wires cost three times more than the common shielded copper wire used for our transmitter’s 4-20mA signal.
  5. Lower Maintenance Time and Expense - Be able to keep track of sensor operation and quickly find and diagnose sensor failures.
  6. Enhance Measurement Accuracy - DCS and PLC systems measure readings over the entire (very wide) range of a sensor. Transmitters can be calibrated to any range within a sensor’s capabilities. Using a narrower range produces more accurate measurements.
  7. Avoid Lead Wire Resistance Imbalances - Transmitters accept true 4-wire RTD inputs. So you’ll be able to avoid lead wire resistance imbalances that inevitably result from wire corrosion and aging.
  8. Simplify Engineering and Maintenance and Prevent Mis-wiring - Instead of numerous sensor lead-wire and DCS/PLC input board combinations, your designs and drawings will only need to show one wire type (twisted wire pair) and one input board type (4- 20mA). Since your system will need only one type of wire and input board, maintenance is greatly simplified, and the chances of loop mis-wiring are virtually eliminated.
  9. Match the Best Sensor to the Application - Universal transmitters take nearly any RTD and T/C input. This lets you use whatever sensor is best for each particular process point. Direct DCS inputs aren’t nearly as flexible because they handle only one type of sensor input per card.
For more information, contact Arjay Automation by visiting or call (800) 761-1749.

Abstracted from Moore Industries "Why Use Temperature Transmitters Instead of Direct Wiring".

Tuesday, May 1, 2018

The Honeywell Analytics Sensepoint XRL

Sensepoint XRL
Honeywell Analytics Sensepoint XRL
The Honeywell Analytics Sensepoint XRL is a single-sensor fixed gas detector designed to meet the needs of industrial applications, and supports the following interfaces (dependent on the model):
  • Analog output: Sensepoint XRL features current loop output, supporting signals in the range 0 to 22 mA. Typically this interface is referred to as 4 to 20 mA.
  • Digital output: Sensepoint XRL supports Modbus RTU digital communications.
  • Mobile app: A mobile app is available to commission and maintain the Sensepoint XRL gas detector.

Honeywell innovation enables customers to pair the gas detector with their mobile phone, and then use an app to perform many tasks related to installation, commissioning and maintenance. By using Honeywell's Bluetooth Low Energy (BLE) technology, you can install, commission and maintain your Sensepoint XRL gas detector from your mobile device. By using their gas detector app you can mange the device from up to 10 meters away.

The Sensepoint XRL Provides:
  • Quick installation.
  • Rapid configuration.
  • Simple operation.
  • Straight forward to maintenance.
Sensepoint XRL is available as a flammable gas detector for the detection of potentially explosive gases, or as a toxic gas detector for the detection of a range of toxic gas hazards commonly found in industrial facilities.

For more information, read the embedded document below, or download the Honeywell Analytics Sensepoint XRL datasheet from here.