4
HOBO LCD Temp/RH User’s Manual
It is possible to disconnect the remote probe and transport the HOBO LCD logger
back to the host PC for data off-loading and relaunching. See details in
Launching
the Logger
on page 4 and
Reading out the Logger
on page 5.
Launching the Logger
To launch the HOBO LCD logger:
1.
Install BoxCar Pro software on the computer (see BoxCar Pro User’s Manual
for details).
2.
Plug one end of the PC interface cable into an available serial port on the host
PC and the other end into the 3.5 mm jack on the logger.
3.
Start BoxCar Pro software. From the
Logger
menu, select
HOBO LCD
Temp/RH
and select
Launch
.
4.
Specify temperature and/or relative humidity measurements based on
available sensors. If you are using an external temperature-only sensor (no
RH capability), make sure the humidity is disabled in the software to
maximize memory space. Otherwise, the unit will record a zero RH value at
every logging interval. Choose any ALERT limits and select other advanced
options. Set the logger to begin logging immediately or at a future date/time.
By default, the logger clock will be set to the computer host time unless you
disable the option “Set Logger Clock with Host Time on Launch.”
5.
Click
Start Logging Immediately
or
Delayed Start
or, optionally, use
Hold
for Launch Later
to start later with HandCar on a Palm handheld.
The temperature, RH (if activated), and memory bars will become visible on the
LCD (see Figure 4) when logging. For full details on software operation, refer to
the BoxCar Pro User’s Manual. When using a Palm handheld, refer to the
HandCar User’s Manual.
Note:
If the deployment requires a remote probe to be permanently installed at the
site and the logger is being launched without a connected probe, use the
Delayed
Start
feature, allowing enough time to transport the logger to the site and attach
the remote probe.
Do not remove and re-insert probes once logging has begun.
Remaining memory is indicated by a five-segment bar. When “wrap
around when full” is not selected in the software, the segments
decrease as memory fills; when it is selected, the segments
continually cycle. Remaining battery level is indicated by a five-
segment bar; segments decrease as battery level decreases.
If the temperature or RH measured by the logger falls outside the
selected high or low limit, the word ‘Alert,’ an alert symbol, and the
temperature or RH measurement that went out of limits will flash. If
an Alert Delay time has been set, the words ‘Alert Delayed’ will
flash until the measurement value returns to within the acceptable
range, or until the programmed delay time has passed and the alert
condition is activated. See “Delaying the Alert Conditions” and “Alert
Behavior” for more information.
Figure 4
HOBO LCD Temp/RH User’s Manual
13
Power
•
3 AAA Alkaline batteries, user-replaceable
Internal Temperature Sensor
•
Measurement range: -20°C to +50°C (-4°F
to +122°F)
•
Accuracy: ±0.7°C at +20°C (±1.3°F at
+68°F), see plot B
•
Resolution: 0.4°C at +20°C (0.7°F at
+68°F)
•
Response time (to 90%): Less than 15
minutes in airflow of 1 m/s (2.2 mph)
•
Temperature Accuracy Drift: Negligible
Internal Relative Humidity Sensor
•
User
replaceable
•
Measurement range: 15% to 95%
at +25°C (+77°F)
•
Accuracy: ±3% over range
of 20% to 80% see plot C
•
Response time to 90%: <2
minutes in airflow of 1 m/s
(2.2 mph)
•
Accuracy Drift: <2% over 5
years typical
External Probe
Specifications
External Analog
Temperature Sensors (Onset part numbers L-TMA-M002, L-TMA-M006,
L-TMB-M002)
•
Measurement range: -40°C to +100°C (-40°F to +212°F)
•
Accuracy: ±0.7°C at +20°C (±1.3°F at +68°F), see plot B *
•
Temperature resolution: 0.4°C at +20°C (0.7°F at +68°F)
•
Response time (to 90%): <3 minutes typical in airflow of 1 m/s (2.2 mph), 1 minute typical
in stirred water (L-TMA-M002, L-TMA-M006, sensor tip and cable can be immersed in
fresh water up to +50°C (+122°F) for 1 year); <3 minutes in still air, 15 seconds in stirred
water (L-TMB-M002, sensor tip only is suitable for immersion)
•
Accuracy drift: < 0.1°C per year
Environmental
•
Operating RH range: 0% to 100%
•
Operating temperature range: -40°C to +100°C (-40°F to +212°F)
External Digital Temperature/Relative Humidity Sensor (Onset part numbers
S-THA-M002, S-THA-M006, S-THA-M017)
Note: Use only digital probes with serial numbers greater than 580314 with this logger.
•
RH measurement range: 0% to 100% between 0°C and +50°C (+32°F to +122°F)
•
RH accuracy: ±3% from 0°C to +50°C (+32°F to +122° F) (±4% in condensing
environments)
•
RH accuracy drift: Less than 1% per year (an additional reversible drift up to +3% can
occur when the average relative humidity is above 70%)
•
RH response time to 90%: 5 minutes typical in airflow of 2 m/s (4.5 mph)
•
Temperature measurement range: -40°C to +75°C (-40°F to +167°F)
0 C
10 C
20 C
30 C
40 C
50 C
60 C
TEMPERATURE (Deg. C)
RELA
TIVE HUMIDITY
100%
80%
60%
40%
20%
0%
+/- 3% RH
+/- 5% RH
Plot B
Internal Temperature Sensor
Accuracy/Resolution
Plot C Internal Model RH Range
