Specifications

Analyzer 2810/2815/2820

Instruction 19-9222

2.3 Pump Operation (2815/2820)

With the analyzer already switched on, momentarily pressing the but-

ton switches on the pump. Pressing the button again turns the pump

off. The supplied sampling probe and hose assembly can be connected

to the gas inlet connector on the top of the analyzer for drawing in gas

samples from hard-to-reach locations.

Particulate lter P/N 54-0548 is placed on top of the gas inlet to prevent

dust or dirt from being drawn into the instrument. Replace the par-

ticulate lter about once a month, or when the lter is contaminated as

evidenced by a slower response time.

Note that the combined sampling hose and probe length should not

exceed 6 feet (1.8 m). Also note that the pump is intended for use only at

normal atmospheric pressure, and is not designed to draw in gas samples

against a vacuum or an obstruction such as a kink in the sampling hose.

If an obstruction or negative-pressure gradient is present, then gas will

not be drawn into the analyzer. Please consult the factory for applica-

tions where longer sampling lengths are required, or where it is neces-

sary to draw against a vacuum.

2.4 Pump Contamination (2815/2820)

Over time the pump can become contaminated, leading to a slower

response time and lower readings. To check for pump contamination,

turn on the pump and hold your index nger over the inlet tting. The

pump should normally stall. If the pump, however, continues to run,

then the pump is contaminated and the analyzer needs to be returned to

Bacharach for repair.

2.5 High Humidity Gas Sampling (2820)

When using the 2820 to draw in gas samples from areas with high levels

of humidity (e.g., incubators), rst install the small round particulate

lter that is supplied with the instrument onto the analyzer’s outlet us-

ing a 1.5" section of Portex tubing, and then connect a lure tting to the

particulate lter. Next, connect the Naon tubing that is also supplied

with the analyzer to the luer tting using a 2" section of Portex tubing.

On the other end of the Naon tubing use a 6 to 12" section of Portex tub-

ing to connect to the incubator. See Figure 2.

Note: If the supplied Portex tubing is too small to t onto the

incubator’s gas sample port, then substitute a larger diameter

tubing of your choice as long as the tubing is nonabsorbent.