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Frequently Asked Questions

Requirements

Do Zydax sensors require an RPU or central server?
No. Our sensors can be operated with a standard PC. Our sensors can be used with an RPU, but they do not require one.
What kind of hardware and software do I need to use Zydax sensors?
Zydax sensors can be used with a standard, off-the-shelf PC running Windows 2000 or newer. You can connect to your sensors using a modem or an RS-485 serial port. Your PC will require a modem if you wish to use the automated callout features of the ZDCP.
Many Zydax sensors use 'RS-485' serial communications. What is RS-485?
RS-485 is a type of serial communication that works over long distances. While RS-485 is not compatible with the serial port on a typical computer, Zydax offers an inexpensive RS-485 adapter.

Features

Some of your sensors support modems. Are these modems land line or cell modems?
Zydax master sensors (ZAPSS and T2WD) can be ordered with an internal landline modem or a modem interface that allows the user to connect to an external cell modem. The internal modem has an operational temperature rating of -50° C to +85° C.
Many sensors with a wet/dry reading read salt crystals as wet. Does the Dual Temperature Wet/Dry Sensor (T2WD) give a false wet indication when salt crystals have dried on it?

No. Zydax sensors utilize patent pending technology that correctly reads salt crystals as dry, while detecting even minimal amounts of moisture. The photo below shows the wet/dry portion of a T2WD Sensor with salt crystals present. The sensor reported dry.

What is the difference between Surface Temperature and Pavement Temperature?
Surface Temperature is the temperature of the roadway surface, while pavement Temperature is the temperature of the bulk material that the sensor is embedded into. The Zydax master sensors ZAPSS and T2WD report both Surface Temperature and Pavement Temperature. Pavement Temperature is measured at a depth of approximately 1¾ inches (4.4 cm) below the surface. Both the ZAPSS and the T2WD can be ordered with additional temperature sensors with cable lengths up to 4000ft (1219 meters). All data regardless of the sensor(s) being utilized as a master or the configuration associated with it are reported simultaneously.
What brands of deicer products can Zydax sensors see and work with?

This question needs to be answered in terms of the product design and not the brand name. As we all know, there are many brand names of products with varying amounts and types of commonly used ingredients.

We have tested many different products where sodium chloride, sodium acetate, magnesium chloride, and calcium chloride were the primary ingredients. We have also tested products where the primary ingredient was Calcium Magnesium Acetate (CMA) or potassium acetate. Additionally, we have tested these various deicer components in various mixtures with each other, both with and without corrosion inhibitors. What we have found from the extensive testing to date is that the Zydax Intelligent Sensor can not only see them, but can also accurately report the freeze point of different blends at different concentrations.

Zydax is very confident that Zydax Intelligent Sensors can detect and report accurate information about whatever product you are using. Also, with the benefits of both the active and passive sensor abilities in one unit (ZAPSS) combined with the intelligence inherent in the ZAPSS, we are able to accurately deliver freeze point information on a brine that may be present on the sensor, even if we don't know what it is.

If you have a specific product that you have concerns about, targeted product testing can be arranged by contacting Zydax. Testing may be done as a part of the sensor purchase process or for a fee. In same cases both may apply. The requester will be required to supply Zydax with a sample of the product (minimum 16 ounces) with complete data sheets listing its components, in what quantities, and a phase curve for the product. Arrangements for the product testing by Zydax must be made in advance of sample shipment.

Contact Zydax with comments or questions.

Applications

Are Zydax sensors useful for anything other than roads maintenance applications?

Zydax sensors can be used to monitor surface and other environmental conditions in many different applications.

Our sensors offer the critical, maintenance oriented information that, in the past, was only availble through RPU based systems that could cost $50,000 or more. A Zydax system can cost as little as 10% of that amount.

The low cost and flexibility of Zydax sensors makes it possible to deploy our systems in many applications where traditional systems were just too expensive.

Installation

Where should a Zydax Active Passive Surface Sensor (ZAPSS) or the Two Temperature Wet/Dry Sensor (T2WD) be installed in a roadway surace, street or parking lot?
The sensor is normally installed in the outside tire track, and if on a multilane highway, in the outside tire track of the outside lane. The intent is to monitor what the traffic is driving on and the tire tracks best represents this. The reason for the outside lane and tire track is to minimize installation procedures and impact to the existing roadway surface. For parking lots, it is installed to best represent the conditions desired to be reported. In some cases it is placed in an area to report what is typically the best conditions, or in other cases it is placed to report the worst case conditions. Regardless of installation location, correct installation procedures and guidelines must be followed.
Should Zydax Intelligent Sensors be mounted level or flush with the highway surface?
A Zydax master sensor (ZAPSS and T2WD) should be mounted flush with the surface it is being installed into. Never install a sensor so that it protrudes from the pavement surface. Each sensor is shipped with a mounting kit that makes proper installation easy to accomplish as long as the area where it is being installed is smooth, sound and not a rut or depression. Installation is covered in the User's Guides and the Installation Guides. They may be downloaded from the Zydax web site (www.zydax.com).

Protocol

Is it true that Zydax sensors use an open protocol?
Yes, Zydax Sensors use a simple text based protocol. Zydax sensors are designed to be easy to integrate with different information systems. The User's Guide for each sensor has a complete list of commands and discusses the responses for each command. In addition, there is a separate user's guide for our open protocol. If desired, data may be provided in NTCIP format.
Are Zydax sensors NTCIP compliant?
Yes, data is provided in published open protocol or, if desired, NTCIP format. The NTCIP standard defines communications protocols between the the Remote Processing Unit (RPU) and other data processing infrastructure, and does not specify communications protocols for sensors. As such, Zydax Intelligent Sensors are are not required to present an NTCIP interface. However, Zydax can and will supply NTCIP compliant data if required by the customer. For more information about NTCIP terms see NTCIP 1204. For more information on available NTCIP communications options, contact Zydax.
Will I be able to use other software to work with the data collected by my Zydax sensors?
The data collected from a Zydax system is designed to be easy to integrate with new or existing systems and applications. Both the raw sensor data and ZDCP log files use standard comma separated value (CSV) format. This format is supported by many database and spreadsheet applications (such as Microsoft Access or Excel). We offer a document that shows how to bring ZDCP log files into an Excel spreadsheet. Data is provided in published open protocol, or if desired, NTCIP format.