4.4
Connect the Probe
The PRT or thermistor probe connects to the top of the 1522 using Hart’s
unique INFO-CON probe connector. The probe connector is inserted into the
top of the instrument with the ridged to the back and fits snugly and locked into
place when it is fully inserted.
The INFO-CON probe connector includes a memory device that
stores the
unique characteristics of the probe,
allowing the 1522 to measure tempera-
ture accurately. If your probe was purchased from Hart for use with the 1522, it
should already have the connector attached and properly programmed. You can
use your own probe with the 1522, but you must attach it to an INFO-CON
connector. See Section 6.6 for more information on the INFO-CON connector
and instructions on properly attaching the probe to the connector.
4.5
Connect the Power Source
The 1522 draws power either from a DC power supply (the included AC
adapter) connected to the DC input or from the internal rechargeable battery
pack. To use the AC adapter, plug it into a wall outlet of the appropriate voltage
and insert the DC plug into the DC power input of the 1522 (see Figure 2.) The
battery pack must first be fully charged prior to using the AC adapter (see Sec-
tion 6.1).
4.6
Switch the Power On
Power is switched on and off with the power button located below and to the
left of the display. To switch the power on, hold the power button down for at
least three seconds and release. (To switch power off, momentarily press the
power button again.) The instrument takes a few seconds to power up, initialize
itself, and begin normal operation. During initialization the lower line of the
display shows the manufacturer, model number, firmware version, and the state
of battery charge or the message “External power” if the AC adapter is at-
tached. If the thermometer readout or probe calibration have expired, the mes-
sages “Prb cal expired” or “Mtr cal expired” are displayed. The 1522 reads
important information about the attached probe from the INFO-CON connector
that is used to calculate temperature.
The 1522 then performs a memory check of critical parameters, such as the cal-
ibration parameters CAL1 and CAL2. During this check the lower line of the
display reads “Checking Memory”. If a “Memory Error” or “Memory Recover”
message is displayed, see Section 12.1, Troubleshooting, for additional infor-
mation and instructions.
4.7
Measure Temperature
After initialization the upper line of the display begins to show temperature
measurements sensed by the probe. Place the probe into the object where you
1522 Handheld Thermometer Readout
User’s Guide
14
