Topac Inc The Instrumentation Company
 
Support page for PBI Checkmate
Oxygen and Oxygen+Carbon Dioxide
 

Welcome to the PBI Checkmate support page. Use the information here in conjunction with the instructions you received with your instrument. FAQs here

 

Attaching the hose to the instrument
The sample hose attaches to the port at the side of the instrument. The needle cover forms a holder which is inserted into the red needle holder when not in use.

sample hose attached to checkmate
 

Sample needle and filter assembly
The sample needle and filter must be assembled as shown in the illustration below
You can purchase these supplies online here

needle and filter assembly
1. Needle 0.8 mm x 40 mm ( 21G x 1.5 ") needle Part No 920012
2. Particulate filter - this is pushed into the throat of the luer fitting on the needle. Part No 970179
3. Liquid blocking filter - this filter prevents liquid from getting into the instrument - you should always use this filter. Use this filter to push the particulate filter (2) into the back of needle. Make sure that the particulate filter is pushed well down into the throat of the needle so that the liquid blocker and needle can be pushed together to form a seal. Part No 980022
4. Pen holder this is the bit you hold - it pushes into the back of the liquid blocker (3) to form a seal. Part No 970169
5. 'O' ring - this makes the seal to the pen holder.Part No 920095
6. Thumb screw - push the hose through the pen holder so that it just touches the back of the filter (3) then screw it just so that it gently squeezes the o ring. It should be firm but do not overtighten. O rings make a seal without a huge amount of force.
Part No 900348
7. 0.5 mm ID hose as supplied with the unit. Part No 920130
Purchase supplies on line here
Flow Pressure Error
This screen will appear if you start the checkmate without attaching the sample hose. It will also appear if there is a leak or a blockage in the sample hose.
You should always attach the sample hose complete with needle and filters before you power up the instrument. Pushing the button beneath the check mark allows you to continue operation. But you must find and correct the source of the error.
flow pressure error
 
User screen.
The screen shows the current reading for oxygen (and carbon dioxide if installed)

Note the bottom three lines. Prod. 2 is the product set up number - you store alarm and operational setting for 10 different products. 'Spot man' next to Prod.2 is the name of product 2. It could be pizza but in the default set up that comes with the instrument the first three products are named after the operational modes assigned to them. This makes it easy for you to check out the three different ways in which the instrument functions without using the set up menu.

The operational mode is shown on the next line down immediately on top of the icons. In this screen the mode is 'Spot man' The spot manual mode. The product named 'Spot man' is operating the spot manual mode.

Similarly the default setting of the product called 'Spot Auto' is Spot auto and the product named ' continuous', is in continuous mode. You should change the product names to reflect your own needs once you have familiarized yourself with the instrument.

The three icons from left to right represent -
The menu icon( or back up key ) This icon always takes you back to a related menu and eventually back to the main menu.
The printer icon activates the printer if installed.

The product icon, third icon, on the right, represents different packages follow this icon to the product selection menu. You can set up 10 products.

Always be aware from the main screen shown here which product you are working with. In this case product No2.

An action is selected by pressing the key below the icon.

User Screen
 
 
Frequently Asked Questions
The ready light does not come in Spot Test Auto
In the Spot Test mode the pump is always running so that the instrument is always sensing the local environment which is atmospheric oxygen at 20.946%. When the needle is inserted into package where the atmosphere is different to the atmospheric oxygen level the Checkmate senses the change and knows that it should complete a measurement cycle and present the analysis of this new environment to the display. When the analysis is complete ( after a second or two ) the instrument again looks for atmospheric oxygen as its reference at 20.9%. As soon as the instrument sees the 20.9% the ready signal comes on to let you know that the Checkmate is ready for the next reading.

1) The ready signal will not come on if you leave the needle in the package - at least not for a very long time.
2) The ready light will not come on if the atmospheric air reading is out of calibration.
For example if your instrument is constantly reading 19% when you sample for atmospheric air the ready light will not come on because the electronics are waiting for 20.9%. The solution for this problem is to re-run the calibration for 20.946% Oxygen as follows.

 
Calibration on Atmospheric Oxygen

1) Make sure the instrument has been warmed up for 30 minutes
2) Make sure that the hose and filters are properly attached
3) Select calibration from the main menu
4) Select calibrate O2 sensor
5) Select the first gas in the gas table Oxygen 20.946
6) Press the big red square to complete the calibration
7) On newer instruments you will be prompted to enter the date after the calibration is complete. If so you must enter the date or the calibration will not take.

 
How to do I work with very small headspaces

The Checkmate is ideal instrument for packages with small headspace and the instrument can take a reading from samples as low as 1 - 2 ml. For such very small sample sizes use the Checkmate in SPOT MANUAL mode. In this mode you have control over two parameters which influence the amount of sample drawn by the pump. - The delay time and the sample time. These parameters are set in the miscellaneous set up menu. The delay time specifies a time that the sample will pass through the instrument before the analysis is made. ( to clear the hose ) The sample time is the time the instrument spends averaging the readings as the sample passes continuously through the detector. (Note that the detector has a very fast response time ~ 50 msecs ) . What you see is a running average of a series of reading for the 'sample time'. For small headspace run with a small sample time.

   

Topac Inc. 231 CJC Highway, Suite 103 Cohasset MA 02025 USA
Tel: 781 740 8778 Fax: 781 740 8779
e-mail: toni@topac.com


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