Specifications

Page 21

A. Gas Detection System – HRM03 / Electronic Flow Meter Replacement

To replace the HRM03 module or the electronic flow meter, first disconnect electrical power to the Bloodhound

and then turn the unit off by selecting “POWER DOWN.” After that, remove the four panel screws that hold the

top cover in place and pull up on the panel about 4 inches and then move the panel towards your person and

stand the cover up in place. This will expose the inner workings of the Bloodhound system.

 Find the HRM03 module and disconnect the four electrical cables

 Remove the two nylon locking nuts that hold the assembly in place using a 7/16” wrench

 Pull upward on the HRM03 module until it clears the mounting bolts.

 Remove the tubing that is attached in three places, noting which tubing goes where. If the tubing is

attached back in the wrong place, the unit will not operate correctly. There is a flow diagram elsewhere in

this document.

 Disconnect the electrical cabling coming from electronic flow meter to the Brain Board at the Brain Board

end. This is a 4 pin locking connector. This locking connector has a small tab on one side that must be

pressed in order for the connector to come loose from the Brain Board. Do not force.

 Replace the module and/or flow meter and assembly is the reversal of removal.

B. Sample and Chromatograph Pumps

The sample pump and chromatograph pumps are high performance medical grade brushless pumps from

Parker. The sample pump and chromatograph pumps are a special order item from Parker and can be

ordered from iBall Instruments. The pumps are a brushless medical grade pump system. The chromatograph

pump is a two wire pump and the sample pump is a three wire pump. They are not interchangeable.

Each brushless pump has a service life of a minimum of 10,000 hours. This translates to over 416 days of

nonstop use. Or more than a year of service per pump.

C. Chromatograph Sample Solenoid

The chromatograph sample solenoid is an Ingersoll Rand part number P251SS-012-D-G. The part is readily

available from Grainger. You can easily call or visit their web site at www.grainger.com and you can have

them delivered to your door. Keep in mind that there is an adjustment on the bottom of the solenoid. on

occasion the solenoid is not adjusted correctly from the factory. If this adjustment is not correct the solenoid

will not transfer the gases correctly. The solenoid is adjusted correctly when there is no cross flow or leakage

between the open and closed positions and a proper amount is injected per sample.

NOTE: User will have to transfer the electrical connector and the plastic fittings from the old solenoid to the

new one.

D. Tubing

There are two types of tubing used in the Bloodhound system. A thick black rubberized tubing and a small 1/8”

ID clear PVC vinyl tubing.

The thick black rubber tubing is automotive grade high vacuum/pressure Goodyear tubing part number 65113.

It is available from Auto Zone or just about any other auto parts store. This tubing has excellent temperature,

characteristics and resists kinking on hard corners. This dark black tubing is shown in the pneumatic diagram

as a heavy dark black line. It is used immediately following the particulate filter, through a plastic T, and then

goes to the inlet side of the sample pump and the sample line vacuum monitor port on the Brain Board. It is

also used to connect the Chromatograph pump inlet to the chromatograph column and through another T

connector to the chromatograph monitor port on the Brain Board.

The second type of tubing is a common 1/8” ID clear PVC tubing that can be found in just about any hardware

store and can be bought for a few cents per ft. A benefit of the clear line is that it useful to observe if any

contaminants or liquids have entered the system.