Instructions

Table Of Contents

6 General Operation

This section explains basic operation of the thermo-hygrometer. Detailed oper

ation of the thermo-hygrometer is explained in Sections 7 and 8. Section 7 ex

plains the menu structure and the functions available in the menu structure and

Section 8 explains the communications interface for operating the thermo-hy

grometer remotely.

6.1 DC Power Source

The thermo-hygrometer requires 12V DC to operate. The AC adapter is pro

vided to produce the DC power from an AC mains supply.

Caution: For CE compliance and for proper performance, use only the

AC adapter shipped with the instrument by Hart Scientific. If the AC

adapter needs to be replaced, contact Hart Scientific Authorized Service

Center. The AC adapter has circuits with high voltages inside that could

present danger of electric shock or fire if exposed. If the AC adapter is

damaged in any way or becomes hot, discontinue use immediately, discon-

nect the adapter from any AC supply, and replace the adapter. Do not at-

tempt to open, repair, or continue using a damaged or defective AC

adapter.

The DC output from the AC adapter plugs into the 12 V DC power input on the

left side of the instrument (see Figure 3 on page 15).

6.2 Battery

The thermo-hygrometer uses a 9V battery to maintain continuous measurement

and recording during power outages. The recommended battery type is a stan

dard 9V alkaline battery (NEDA 1604A or IEC 6LR61). During a power out

age, or when the AC adapter is disconnected, the display will be inoperable but

measuring will continue if the 9V battery is installed. If the alarm is enabled,

the beeper will sound periodically to alert the user of the loss of external power.

With a fresh alkaline battery, measuring will continue during a power outage

for typically about 16 hours. During normal operation, the battery charge is

regularly checked, and if the low battery alarm is enabled, the user will be

alerted when the battery charge drops below approximately 50%. The battery

charge level can be viewed with a display layout that includes a stat type zone

with one of the fields set to BATT. To prevent inadvertent battery drain, remem

ber to switch the power switch off when external power is disconnected and the

thermo-hygrometer is not in use.

To install or replace the battery, follow these steps:

1. Switch the power off and unplug the DC power cord.

6 General Operation

DC Power Source