Specifications

Instruction 0019-9321

Comfort Chek 100/200

2.3 Pump Operation (Model 200)

With the instrument already switched ON, momentarily pressing the

button will start and stop the internal pump. The optional Extended

Probe Assembly with in-line ﬁ lter (P/N 0019-3310) can be connected to

the gas inlet ﬁ tting (Figure 1, Item A) on the top of the instrument for

drawing in gas samples from hard-to-reach areas. If desired, a section

" I.D. tubing can be connected to the gas outlet ﬁ tting (Figure 1,

Item B) to exhaust the gas being sampled to an outside area.

Note that the combined sampling hose and probe length should not

exceed 6 feet (1.8 m). Also note that the internal 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 pres-

ent, then gas will not be drawn into the instrument. Please consult the

factory for applications where longer sampling lengths are required, or

where it is necessary to draw against a vacuum.

2.4 Pump Contamination (Model 200)

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 ﬁ nger over the inlet ﬁ tting. The

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

the pump is contaminated and the instrument needs to be returned to

Bacharach for repair.

2.5 Selecting the Measurement to be Displayed

Depending upon which model of the Comfort Chek was purchased, sev-

eral different gases and environmental measurements can be taken as

described in Section 1.1 General.

Important! The temperature and humidity sensor probe (Fig-

ure 1, Item D) must be installed for the instrument to operate

properly. If this probe is removed, inaccurate temperature and

humidity readings will be displayed.

Each measurement is displayed separately on the instrument’s LCD

(Figure 1, Item C). The measurement displayed is selected by pressing

the f

button.