SPECIFICATIONS
LED FLASHING MODES LCD INDICATORS (TW-USB-1-LCD, TW-USB-2-LCD, TW-USB-2-LCD+ & TW-USB-TC-LCD ONLY)
Green double ash
Every 20 seconds: logger full, no alarm
Green single ash
Every 30 seconds: delayed start
Every 20 seconds: low battery, logging, no alarm
Every 10 seonds: logging, no alarm
Red/Green single ash
Every 20 seconds: logger full, last value equal to or
exceeds the low or high alarm
Red double ash
Every 10 seconds: logging, high alarm
Every 20 seconds: logging, high alarm, low battery
Red single ash
Every 10 seconds: logging, low alarm
Every 20 seconds: logging, low alarm, low battery
No LEDs ash
LEDs disabled during conguration to save battery
power and increase logging life /logger stopped /
battery empty
TW-USB-1-LCD, TW-USB-1-RCG,
TW-USB-TC & TW-USB-TC-LCD
Green double ash
Delayed start
Red double ash
High alarm
Orange double/single ash
Memory full
Green single ash Logging, no
alarm
Red single ash
Low alarm
Orange single ash every 60 sec
Low battery
No LEDs ash
Logger stopped or battery empty
TW-USB-1 TW-USB-2, TW-USB-2+,
TW-USB-2-LCD & TW-USB-2-LCD+
Green triple ash
Logger full, no alarm on the channel
Red triple ash
Logger full, alarm on the channel
Green double ash
Delayed start
Green single ash
Logging, no alarm
Red single ash
Logging, low alarm on the channel
Red double ash
Logging, high alarm on the channel
No LEDs ash
Logger stopped or battery empty
Temperature scale symbols
Maximum/Minimum
logged value symbol
LCD INDICATION
Display Logger Status Explanation
Delayed Start
Push to Start
Logging
Stopped
This is shown when the logger is set to
start at a specic data and time*
This is shown when the logger is setup
for “Push to start” logging
This is shown when the logger is running
in “LCD off” mode, and the button is
pressed. The display clears again after
three seconds
If the logger has not been set to log and
the button is pressed, three dashes are
displayed for three seconds
* If the logger is set to “LCD off” or “LCD on for 30 seconds” mode, then this will only be shown after the
button is pressed. Otherwise the display will remain blank.
DISPLAY AND STATUS FUNCTIONS LCD INDICATION
TW-USB-1-LCD & TW-USB-2-LCD
TW-USB-TC-LCD
www.thermoworks.com
Part No Function Range Accuracy (overall error)
Typ. Max.
Readings Battery Battery Life*
TW-USB-1 Temperature –35 to 80°C (–31 to 176°F) ±1ºC (±2ºF) 16,382 3.6V ½AA 1 year
TW-USB-1-LCD Temperature with LCD –35 to 80°C (–31 to 176°F) ±0.5ºC (±1ºF) ±1.5ºC (±3ºF) 16,382 3.6V ½AA 1 year
TW-USB-1-PRO Extended Temperature –40 to 125°C (–40 to 257°F) ±0.2ºC (±0.4ºF) 32,510 3.6V ⅔AA 3 years
TW-USB-1-RCG Temperature with rechargeable
battery –20 to 60°C (–4 to 140°F) ±1ºC (±2ºF) 32,510 Lithium Ion 1 month
(rechargeable)
TW-USB-2 Temperature, Humidity & Dew Point
–35 to 80°C (–31 to 176°F)
0 to 100%RH
±0.5ºC (±1ºF)
±3%RH
±2ºC (±4ºF)
±6.0%RH
16,382
16,382
3.6V ½AA 1 year
TW-USB-2+ Increased Accuracy Temperature,
Humidity & Dew Point
–35 to 80°C (–31 to 176°F)
0 to 100%RH
±0.3ºC (±0.6ºF)
±2.0%RH
±1.5ºC (±3ºF)
±4.0%RH
16,382
16,382
3.6V ½AA 1 year
TW-USB-2-LCD Temperature, Humidity and Dew
Point with LCD
–35 to 80°C (–31 to 176°F)
0 to 100%RH
±0.5ºC (±1ºF)
±3.0%RH
±2ºC (±4ºF)
±6.0%RH
16,382
16,382
3.6V ½AA 1 year
TW-USB-2-LCD+ Increased Accuracy Temperature,
Humidity and Dew Point with LCD
–35 to 80°C (–31 to 176°F)
0 to 100%RH
±0.3ºC (±0.6ºF)
±2.0%RH
±1.5ºC (±3ºF)
±4.0%RH
16,382
16,382
3.6V ½AA 1 year
TW-USB-TC Thermocouple (J, K and T-type)
–200 to 1350ºC (–328 to 2462ºF) (K-type)
–200 to 1190ºC (–328 to 2174ºF) (J-type)
–200 to 390ºC (–328 to 734ºF) (T-type)
±1ºC (±2ºF) ±2ºC (±4ºF) 32,510 3.6V ½AA 6 months
TW-USB-TC-LCD Thermocouple with LCD
(J, K and T-type)
–200 to 1350ºC (–328 to 2462ºF) (K-type)
–200 to 1190ºC (–328 to 2174ºF) (J-type)
–200 to 390ºC (–328 to 734ºF) (T-type)
±1ºC (±2ºF) ±2ºC (±4ºF) 32,510 3.6V ½AA 6 months
*Depending on logging rate, ambient temperature, and use of alarm LED
ThermoWorks
ThermoWorks, Inc.
741 E. Utah Valley Dr.
American Fork, UT 84003
UNITED STATES
T (801) 756-7705
F (801) 756-8948
Temperature
scale
Relative Humidity
symbol*
Minimum logged
value symbol
Maximum logged
value symbol
Reading
Negative symbol
*TW-USB-2-LCD only
Issue 3 P-12-018-02-b
