Friday, March 8, 2019

KROHNE SMARTPAT Process Analytics Sensors

The KROHNE SMARTPAT is a series of digital 2-wire loop powered sensors with integrated transmitter technology. Using a VP cable, any SMARTPAT sensor can be connected directly to the process control system via 4-20 mA / HART 7 interface, which provides a large advantages in both handling and costs of a measuring point. Available in pH, ORP, Conductivity, Total Suspended Solids, Oxygen, Disinfectant, and Turbidity. Additional transmitters on site are no longer necessary. All SMARTPAT sensors can be configured and calibrated offline via PACTware FDT/DTM, on site with a HART handheld, or an optional loop powered operating unit.

Instrument Specialties, Inc.

Tuesday, February 26, 2019

SUPERIOR Water Solutions Gas Chlorinators

SUPERIOR Gas Chlorinator
The SUPERIOR Gas Chlorinator is con­sidered the industry "workhorse" of gas chlorinators. The efficient design, coupled with the long lasting materials, creates reliable water disinfection systems with a safety first, user friendly design that is cost effective to install and so easy to operate and maintain. The SUPERIOR Gas Chlorinator is the optimum choice for water disinfection, whether for drink­ ing water, sewage treatment, industrial processes, food pro­cessing, cooling water, or swimming pools.

The vacuum-operated, solution feed type SUPERIOR Gas Chlorinator can be either mounted directly on a chlorine cylin­der valve, or wall mounted. Chlorine flow rate is manually adjusted. The design is such that a number of automatic flow rate control devices can be easily added. Modern mod­ular design makes it easy and cost-effective to expand or upgrade the system.

Download the complete SUPERIOR Gas Chlorinator brochure.

For more information, contact Instrument Specialties, Inc. by calling 407-324-7800 or visiting their website at

Wednesday, December 12, 2018

Influent Flow Monitoring at Wastewater Treatment Plant

Influent Flow Monitoring
Figure 1: Signature flow meter  with LaserFlow
sensor sheltered in weather enclosure.
Four Teledyne ISCO Signature Flow Meters, each configured with 360 LaserFlow sensors, were installed at the inlet of a very large wastewater treatment plant (WWTP). This flow monitoring technology provided a unique solution for the challenging flow conditions at this site. Non-contact Doppler laser technology was chosen by the user for their continuous and maintenance free flow monitoring.

Inlet Section Overview

Flow monitoring in the wastewater treatment process is key for verifying performance of the plant as a whole, as well as its individual processing sections. Due to the enormity of the plant’s processing capacity sewage streams are transferred to the plant through different main sewers, which merge into four rectangular inlet channels, each with a width of 1.5 m. At this location, the Signature flow meters and their non-contact LaserFlow sensors were installed over each of four inlet channels and sheltered in all-weather enclosures (Figure1).

Influent Flow Monitoring
Figure 2: Multi-point/Multi-depth velocity method.
Site Challenges

Sludge buildup at the bottom of the channels and high sediment concentration in the flow streams were the major problems for continuous flow rate measurement. The performance of submersible, continuous wave Doppler sensors, previously installed at the site, had been adversely affected by site conditions and required costly maintenance.

Finding the Solution with LaserFlow

The Teledyne Isco distributor recommended using the non-contact LaserFlow sensor at the site. The conditions at the bottom of the channels were less than ideal for traditional flow monitoring. Being placed over the channel LaserFlow overcomes this. First, the unit’s built-in ultra-sonic level transducer determines the stream’s level. This is done by emitting an ultrasonic pulse and measuring the time it takes for the echo to return from the stream’s surface. By using ultrasonic level measurement the sensor can calculate a subsurface point at which to focus an optical laser. The frequency shift (Doppler shifting) of the returned light from the laser is proportionate to the water’s velocity. LaserFlow is able to measure velocities at up to fifteen points below the water’s surface. Being able to measure at multiple points minimizes the effects of turbulence and eliminates the need for manual profiling. Above average results are achieved by producing a level measurement and an exceptionally accurate mean velocity reading.

Measuring Results and Feedback
Influent Flow Monitoring
Figure 3: Flow Rate Measuring Results for four
inlet channels in dry weather conditions.

Thanks to its non-contact technology for velocity and level measurement, the Signature configured with a LaserFlow was capable of providing consistent and continuous flow rate results (Figure 3).

The end-user was able to reduce costs of service by limiting site visits to periodic inspections of the LaserFlow without the need for stopping flow, entering into the manhole and/or cleaning the sensors.

For more information, contact Instrument Specialties, Inc. by calling  407-324-7800 or visiting

Wednesday, December 5, 2018

How to Zero and Span the SOR 815DT Smart Differential Pressure Transmitter

SOR 815DTThe SOR 815DT smart differential pressure transmitter is a rugged, compact, light weight, loop powered instrument that is ideally suited for hazardous locations and hostile environments where space is limited. The 815DT offers many industry standard outputs to meet applications where low cost, discrete and continuous monitoring is required or preferred. This versatile instrument may be used to reliably measure differential pressure, level or flow.

Zero and Span
  1. The 815DT has the ability to easily set the zero and span set points with a magnet externally.
  2. Located on the casting is a circle for zero and a triangle for span.
  3. To set the zero, bring the pressure to the desired value, and touch the magnet to the circle for 3 seconds.
  4. This will set the current pressure to zero.
  5. This is the same process for setting the span.
  6. Also, by holding the magnet to the circle and triangle at the same time, you will enter a test mode.
Instrument Specialties, Inc.

Thursday, November 29, 2018

Applying Electric Valve Actuators: Needs Assessment

Electric valve actuator
Electric valve actuator (AUMA)
Electric actuators can be found in all varieties of shapes and sizes in waste water treatment plants.  Since the valves to be automated vary in both design and dimension, size consideration and design through an early "needs assessment" is a critical component of the specification process.

Defined as an explicit set of requirements to be satisfied by a material, product, or service, engineers, during this step, will specify what the solution will accomplish, without describing how it will do it.  Specifications usually originate from either design constraints or functional requirements.

As part of the spec requirements and need assessment, these are a number of the questions that engineers should consider, as early in the process as possible, in assessing the needs for a valve actuator.
  1. What sort of valve will be needed?  Does the process require linear control valves or rotary quarter turn valves?  This will define the appropriate type of actuator, as well.
  2. What is the specification for the actuator sizing? The size will need to match the needed thrust and torque as well as the type of valve.  The efficient actuator, to ensure good valve control, can be neither oversized nor undersized.
  3. What are the power requirements, e.g. how much energy will be needed to run the actuator?  Higher voltage actuators use more energy. Low power requirements mean that backup power is more economical.  In most settings, there is a need to save money by running as efficiently as possible, and there are also environmental sustainability hurdles. 
  4. Operating Conditions:  Is there severe weather or will the actuator be under water? What is the range of temperatures expected? Keep in mind that not all actuators can work in all conditions.
  5. Will the actuator need to run continuously or intermittently? Consider the variation needed in the process. Actuators that have continual modulation are more able to respond to variations in the control requests.
  6. Consideration of environmental safety conditions.  What about dust or explosive gases?
Ultimately, the needs assessment will help guide the specification process, with the goal of ensuring how well the final product will perform.  It will pay off to be as detailed as possible during this phase.  Once a needs assessment is finalized, you will be in a better position to specify the right actuator to meet your process requirements.

For more information on specifying electric valve actuators, contact Instrument Specialties by calling 407-324-7800 or visit their web site at