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8. Troubleshooting
• Error: Display shows “ ER1” + backlight is red + 3 beeps sound
Meaning: The room temperature has dropped below 10 ˚C/ 50 ˚F or exceeded 40
˚C/ 104˚ ˚F. Desired action: Store the thermometer at room temperature.
• Error: Display shows “ ERC” + backlight is red + 3 beeps sound
Meaning: EEPROM data reading error or the correcting process is not nished.
Desired action: Contact your supplier.
• Error: Display shows low-voltage signal (not blinking) Meaning: The battery
voltage is below 2.61V±2%. Desired action: Replace the batteries according to the
instructions.
• “L ˚”: Measurement is below 0.0 ˚C or 32 ˚ F. Desired action: Check that you are
following the instructions for taking accurate measurements.
• “H ˚“: Measurement exceeds 99,9 ˚C or 212 ˚ F. Desired action: Make sure you are
following the instructions for taking accurate measurements.
9. Technical Information
• Model: Dual Mode Infrared Thermometer DMT-489
• Applicable regulations and laws: ASTM 1965/EN12470-5/GB/T 19146-2010
• Temperature units: ˚C/˚F, adjustable
• Measurement range: 0.0˚C-100.0˚C / 32.0˚F-212.0˚F Precision: ±0.2˚C /±0.4˚F
• Display resolution: 0.1˚C/0.1˚F
• Latency Time: 1 second
• Sound: Volume 50 dB (Distance from dB Volume sensor to thermometer is 10cm)
• Automatic shutdown function: ±10s
• Low-voltage display function: low-voltage sign shows when the voltage is below
2.51V±0.15V
• Memory function: capacity of 20 data sets
• Current consumption: I stand-by<2μA I working<0.5mA
• I Buzzer on<2mA I backlight<15mA
• LED backlight specications: 1.2cd/m2
• Operational conditions: ASTM 10˚C-40˚C (50˚F-104˚F)/15-95%RH
• Operational atmospheric pressure range: 860hPa to 1060hPa
• Battery: Two 1.5V AAA type batteries
• Battery life: 3000 measurements
• Accuracy (for clinical test): maximum allowable error for clinical test
= Terror = T1-Tref + T2-Tref 2 ≦0.3˚C/0.6˚F (for 95%) (T1 and T2 represent
temperature value for thermometer under test; Tref represents the constant
reference temperature).
• ASTM laboratory accuracy requirements in the display range of 37 to 39˚C
(98 to 102˚F) for IR thermometers is +/- 0.2˚C (+/- 0.4˚F), whereas for mercury-
in-glass and electronic thermometers, the requirement per ASTM Standards
E667-86 and E1112-86 is +/- 0.1˚C (+/- 0.2˚F).
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