2. General Description

2.3 Control unit

Front panel controls

12

13

14

15

16

Fig. 5. Control unit. Front panel.

No.

Item

Description

 

 

 

12

Absorbance range

Selector for the desired absorbance range

 

selector

0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1 or 2 AU full scale

 

 

deflection. In the position SHORT, the signal output

 

 

terminals are disconnected from the rest of the control

 

 

circuitry and short-circuited. This position is useful when

 

 

setting zero on the recorder.

13

Mode switch

The AU / % T switch, enables the UV-1 to be used

 

AU or %T

to monitor the absorbance or transmission of a flowing

 

 

liquid. When the UV-1 is used in the AU mode, each of

 

 

the other position corresponds to the optical

 

 

absorbance which will give a full scale deflection (fsd)

 

 

on a recorder with a sensitivity of 10 mV. Absorbances

 

 

are measured relative to air or a liquid which is present

 

 

in the reference cell

 

 

When the recorder is used together with UV-1 in the

 

 

% T mode, the absorbance range selector switch is

 

 

used, together with baseline adjust, to adjust the

 

 

recorder response corresponding to 100 % T

14

Baseline adjust

Ten-turn potentiometer to adjust the recorder baseline

15

Indicator lamp

Indicates power is on

16

Mains switch

The UV-1 is turned on by switching this knob in the ON

 

 

(upper) position. The indicator lamp will light to show

 

 

that the mains voltage is on

 

 

 

9