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Maintenance

The overall dimensions of the Brewer assembled on the tripod stand are shown below. For more detailed information, please refer to the Brewer MkIII Operators Manual.

Drawing of Brewer MkIII

 

Power requirements

The Brewer MkIII is available in two versions; 115 VAC, 50/60 Hz, 3A or 230 VAC, 50/60, 1.5A. The standard AC power cable is 15 m long and must be connected to a grounded power outlet. A longer power cable can be provided with the Brewer at extra cost.

If the mains power is unreliable, the operating computer and the Brewer should have an Uninterruptable Power Supply (UPS) to protect against brown-outs and short-term interruptions. For longer term power outages the UPS can be set to shut down the computer in a controlled manner and restart the computer and software when power is restored.

If power is interrupted no damage will occur to the Brewer, but measurements will cease. When power is restored it will take several minutes for the Brewer to reinitialize.

Installation site

It is important to choose a good location to install the Brewer. There are several requirements for a suitable site. If the temperature is likely to drop below -20°C, or regularly below 0°C with high wind-chill factors, the optional Insulated Cold Cover will be required. There are no specific limitations for the altitude at which a Brewer can be installed. For example, Brewers have been installed on Mauna Loa, Hawaii at over 4000 m.

Unobstructed view

The Brewer makes Ozone measurements by looking at the sun, so it is important that a site is chosen where the sun will not be blocked by buildings, trees, etc. The Brewer MkIII can make good Ozone measurements when the sun is at an angle of 10˚ above the horizon (80° solar zenith angle). Ideally nothing should block the sun when it is above this angle, or cause shadows to fall on the Brewer. Reflections from surrounding buildings and obstructions should also be avoided as this will affect the quality of the global UV radiation measurements through the dome.

Mounting surface

The Brewer is an instrument that must be installed with the optical system exactly horizontal in order that it can point at the sun correctly through the year.

The mounting surface should be solid and reasonably flat, differences of up to 5 cm can be covered by adjustment with the feet of the tripod stand. The surface must be stable so that levelling of the Brewer does not change with time. An example is shown in the picture at right using a concrete base. The minimum practical size is 2m x 2m x 0.1m thick.

The tripod must be tied down to the base to hold the Brewer stable in high winds and heavy weather. The tripod has a central hook for this and the base must have a suitable fixing point. Failing to do this could cause the Brewer to be blown over during a storm.

Distance between Brewer and computer

The maximum recommended length for the RS-422 communication cable is 100 m. Note that the standard communications cable supplied with new Brewers is 15 m long. If this distance is not sufficient, a longer communications cable, or extension cables, can be provided with the Brewer at extra cost.

Lightning protection

To help protect the Brewer from lightning strikes, it is recommended that a metal lightning rod with the proper grounding facilities is positioned close to the Brewer to conduct away the charge. However, the rod should not obstruct the Brewer’s view of the sun. If mounted on a roof, the Brewer and any other instruments should be grounded through a copper strip, or a large cross-section copper cable, down the outside of the building to the ground point. The Brewer itself is grounded through the AC power cable.

Computer and software

The Brewer must be connected to a computer with the operating software running in order to make measurements and store data. Communication with the Brewer is serial RS-422 and the instrument is supplied with an optically isolated RS-422 to RS-232 converter to enable connection to a serial port of the operating computer. The convertor is supplied with an AC power adaptor and should be placed close to the computer.

Computer hardware requirements

A computer is not supplied with the Brewer and should be obtained locally for ease of warranty and support.

Because the computer must be operating continuously it is recommended to use a desk-top machine as these are specifically designed for continuous operation. They usually have the recommended ‘legacy’ RS-232 port with locking screws that provide a secure physical data connection.

High quality RS-232 to USB converters may work (although the connection is not physically locked and is not secure), but compatibility is dependent upon the converter characteristics.

The Brewer communication is not fast and the amount of data stored is small. Any modern computer is fast enough and has more than sufficient data storage capacity to operate the Brewer.

Computer operating system

The Brewer operating software uses the DOS based GW-BASIC environment and is under the control of Environment Canada. Some operating systems can have problems with this software.

Below is a list of operating systems that are known to work reliably with the Brewer software:

  • Windows™ XP 32 bit
  • Windows™ 7 32 bit

The following operating systems may work but can sometimes crash or have communication errors and are not recommended:

  • Windows™ 98
  • Windows™ 2000
  • Windows™ XP 64 bit
  • Windows™ 7 64 bitWindows™ Vista usually does not work at all.Note: To avoid problems with regional formatting an English version of Windows™ must be used.

Customer responsibilities

Civil works, infrastructure and cabling are normally required, as previously described, to prepare the site for installation of the Brewer by a Kipp & Zonen technician.

Such works usually consist of a concrete slab, on top of which the Brewer will be installed, with a hook to which the Brewer tripod stand tie-down chain can be attached; lightning protection, AC power connection, RS-422 communication cable, procurement and installation of the Brewer operating computer, UPS, etc.

Such works are not the responsibility of Kipp & Zonen. However, such works and any warranties pertaining thereto, may form a part of a contract between the end-user and a local Kipp & Zonen representative, such as a distributor.