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 flash
Every 20 seconds: logger full, no alarm
Green single flash
Every 30 seconds: delayed start
Every 20 seconds: low battery, logging, no alarm
Every 10 seonds: logging, no alarm
Red/Green single flash
Every 20 seconds: logger full, last value equal to or
exceeds the low or high alarm
Red double flash
Every 10 seconds: logging, high alarm
Every 20 seconds: logging, high alarm, low battery
Red single flash
Every 10 seconds: logging, low alarm
Every 20 seconds: logging, low alarm, low battery
No LEDs flash
LEDs disabled during configuration 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 flash
Delayed start
Red double flash
High alarm
Orange double/single flash
Memory full
Green single flash
Logging, no
alarm
Red single flash
Low alarm
Orange single flash every 60 sec
Low battery
No LEDs flash
Logger stopped or battery empty
TW-USB-1
TW-USB-2, TW-USB-2+,
TW-USB-2-LCD & TW-USB-2-LCD+
Green triple flash
Logger full, no alarm on the channel
Red triple flash
Logger full, alarm on the channel
Green double flash
Delayed start
Green single flash
Logging, no alarm
Red single flash
Logging, low alarm on the channel
Red double flash
Logging, high alarm on the channel
No LEDs flash
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 specific 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
⅔
AA
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
E orders@thermoworks.com
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
