User manual HANNA INSTRUMENTS HI 9053

[. . . ] 4 Functional Description of HI 9055 . . . . . . . . . . . . . . . 5 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Operational Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Functional Operation Guide . . . . . . . . . . . . . . . . . . . . . . [. . . ] Measurements can be per°C formed in either the Centigrade °F or Fahrenheit scale. To change the scale, press the °C/°F button once. HOLD MODE The reading hold function is activated by the HOLD (HI 9043 and HI 9044) or MEM HOLD (HI 9053 and HI 9055) key. The measured temperature is frozen on the display when this key is pressed. A blinking "M" on display indicates the operation mode. By pressing this key again, the meter returns to its regular operation mode. HOLD CLEAR FUNCTION Erase the memorized highest and lowest measured values by pressing the CLEAR key. Upon depressing the CLEAR key, the present measurement reading is assigned as the highest and lowest temperature in memory, i. e. both stored temperature values are equal. The "HI" and "LO" display indicators will blink twice to notify user that the clearing process is in progress. ALARM (HI 9053 and HI 9055 only) CLEAR HI LO MEM HOLD During the start up the alarm is disabled. It may be enabled or disabled again by pressing the ENABLE key. Both the high and low set points are by default set at 25°C or 77°F, conforming to the model. ENABLE M HI / LO FUNCTION The maximum and minimum temperatures are monitored throughout a continuous measuring process. The values may be recalled or HI LO cleared at any time during the measurement. Check the highest or lowest HI LO measured temperature by pressing the respective HI or LO key button. The appropriHI ate display indicator, "HI" or "LO", will be displayed together with the value retrieved from memory. Release the key to resume the normal operation. 10 The alarm is triggered when the measured value is greater than the high set point or lower than the low set point. In such an instance, the corresponding graphics indicator blinks accompanied by a sound. The buzzer may be turned off by pressing any key except the ON/OFF key (by pressing ON/ OFF the alarm is disactivated and the scale changes). Reactivation is possible by turning the alarm off and on again, i. e. by pressing ENABLE key (note that the set point values will not be affected by this action). To set the alarm limits, press the SET key on the front panel. SET 11 The flashing "HI ·))" and "LO ·))" HI ·)) alarm indicators request the LO ·)) user to opt for the set mode. Select the HI key to enter the HI LO set mode for high temperature point or the LO key for the low temperature limit. [. . . ] Any variation introduced by the user to the supplied equipment may degrade the instruments' EMC performance. To avoid electrical shock, do not use these instruments when voltages at the measurement surface exceed 24VAC or 60 VDC. To avoid damages or burns, do not perform any measurement in microwave ovens. In particular cases HI 9043 and HI 9044 may switch from °C to °F or vice-versa. [. . . ]