Hart Scientific Model 1620 "the DewK" Temperature / Humidity Data Logger
Model 1620 - the DewK
Temperature / Humidity Data Logger
 Ordering Info
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The Model 1620—the DewK—accepts inputs from up to two sensors, which may be mounted directly on the unit or remotely (up to 50 feet away).
Each sensor comes calibrated for temperature and humidity from Hart Scientific and contains its own calibration data so recalibration doesn’t require the DewK itself.
Two sensor models are available. The “S” model reads temperature to ±0.25°C over its calibrated range of 15°C to 35°C. It records humidity to ±2% RH from 20% to 70% RH. The “H” model reads temperature to ±0.125°C over its calibrated range of 16°C to 24°C. It measures humidity to ±1.5% RH from 20% to 70% RH. NIST-traceable certificates are provided showing test uncertainty ratios from Hart’s cal lab as good as 4:1. Total range for both sensor models is 0°C to 50°C and 0% to 100% RH. |
| Specifications |
| Temperature Range |
0°C to 50°C |
Temperature Accuracy
(“H” Model) |
16°C to 24°C: ±0.125°C (calibrated)
0°C to 16°C, 24°C to 50°C: ±0.5°C (uncalibrated typical) |
Temperature Accuracy
(“S” Model) |
15°C to 35°C: ±0.25°C (calibrated)
0°C to 15°C, 35°C to 50°C: ±0.5°C (uncalibrated typical) |
| Delta Temperature Accuracy |
±0.025°C for ±1°C changes within 15°C to 35°C |
| Temperature Resolution |
User selectable up to 0.001°C |
| RH Range |
0% to 100% RH |
RH Accuracy
(“H” Model) |
20% to 70% RH: ±1.5% RH (calibrated)
0% to 20% RH, 70% to 100% RH: ±3% RH (uncalibrated, typical) |
RH Accuracy
(“S” Model) |
20% to 70% RH: ±2% RH (calibrated)
0% to 20% RH, 70% to 100% RH: ±3% RH (uncalibrated, typical) |
| Delta Humidity Accuracy |
±1.0% for ±5% changes within 20% to 70% RH |
| RH Resolution |
User selectable up to 0.01% |
| Inputs |
Two sensors, each measuring temperature and relative humidity; each is detachable, cable-extendable, and interchangeable, with self-contained calibration; each may be assigned a unique 16-character identification |
| Display |
240 x 128 graphics monochrome LCD, displays temperature and humidity data graphically, numerically, and statistically; 16 pre-defined, user-changeable screen set-ups are included |
| Memory |
400,000 typical individual time-stamped readings (excluding PC card storage) |
| Alarms |
Visual and audio alarms for temperature, temperature rate, RH, RH rate, and fault conditions |
| Communications |
RS-232 and IrDA |
| PC Card Interface |
64-MB flash memory for downloading data to a PC; data can likewise be uploaded from a PC card into the DewK for graphical and statistical display |
| Enclosure |
The DewK may be wall-mounted (hardware included) or set on a benchtop |
| Power |
12V DC from external 100-240 VAC power supply |
| Operating Range |
0°C to 50°C |
| Size (DewK) |
4.9" H x 8.3" W x 2.0" D (125 x 211 x 51 mm) |
| Size (Probes) |
3.1" H x 0.75" dia. (79 x 19 mm) |
| Weight |
1.5 lb. (0.7 kg) |
| Calibration |
Certificate of NIST-traceable temperature and humidity calibration included; supplied data includes three each temperature and humidity points |
Environmental conditions matter. They affect
critical processes and are a vital variable in many measurement and quality
control systems. So when you depend on accurate measurements and
reliable records of ambient conditions, why compromise on your tools?
Most environmental data loggers don’t display
the data they’re logging. Most instruments with digital displays
lack accuracy. Old-fashioned strip-chart recorders run out of ink
and just add to an already excessive amount of paperwork
Think we’re building up to something here?
You better believe it. We’ve got the crème de la crème
of environmental measuring instruments and we know you’re going to love
it! Introducing… the DewK.
Multiple Sensors
The DewK has two inputs for sensing probes,
with each probe measuring both temperature and relative humidity. Both
probes can be run via extension cables to remote locations up to 50 feet
away, or one probe can be directly mounted to the top of the DewK.
Each probe is calibrated for both temperature
and humidity at Hart Scientific. The calibration constants assigned
to the sensors reside in a memory chip located inside the probe housing,
so probes may be used interchangeably between different DewKs and the recalibration
of probes doesn’t require an accompanying Dewk. Probes may also be
assigned a unique identifier (up to 16 characters) to facilitate record-keeping
by matching the probe identifier with the collected data.
Each DewK ships with one probe, with additional
probes available from Hart. Spare probes may also be purchased as
a kit, which includes a case for the probe, a wall mounting bracket, and
a 25-foot extension cable.
Accuracy
Two types of probes are available from Hart,
and the DewK may be originally purchased with either one.
The standard accuracy probe (“S” model)
reads temperature to ±0.25°C over its calibrated range of 15°C
to 35°C. Relative humidity readings are to ±2% RH from 20% to
70% RH.
The high accuracy probe (“H” model) reads
temperature to ±0.125°C over a calibrated range of 16°C
to 24°C. Relative humidity readings are to ±1.5% RH from 20%
RH to 70% RH.
Both probes can also measure temperature
below their respective calibrated ranges to 0°C and above their respective
calibrated ranges to 50°C with typical accuracy of ±0.5°C.
And RH readings from 0% to 20% RH and from 70% to 100% RH are typically
within ±3%.
Statistics
In addition to temperature and humidity, the
DewK calculates dew point, heat index, and rates of change for both temperature
and humidity. Min, max, and a variety of other statistics are also
calculated and can be shown on-screen. Daily summary statistics,
including min, max, and maximum rates of change are stored for the most
recent sixty days.
Memory and PC Interface
The DewK has enough on-board memory to store
up to 400,000 date- and time-stamped data points. (That’s two years
worth of data for both measurements from two sensors if readings are taken
every ten minutes!) A PC Card slot (PCMCIA) can be used for additional
storage and for transferring collected data to a PC. The DewK also
includes RS-232 and IrDa communications ports. Measurements can be
taken by the DewK in user-selectable intervals ranging from every second
to every hour.
Data transferred to a PC (whether in real-time
or as a historical record) can be easily viewed and analyzed using Hart’s
optional LogWare III software (Model 9936). Likewise, stored data
can be loaded back into the DewK through the PC card for statistical and
graphical analysis in the DewK itself.
Data can also be sent to a printer in real-time
via the RS-232 connection.
Alarms
Alarm settings can be quickly set up in the
DewK based on temperature, the rate of change in temperature, RH, the rate
of change in RH, and instrument fault conditions. Alarms can be both
visual (flashing display) and aural (beeping). Likewise, alarm settings
can be set up and events triggered in LogWare III.
A backup battery shuts down the DewK’s
display but maintains measurements for up to sixteen hours in the event
of a power failure.
Configurable Display
Want to view data from across the room?
Want to view data from two temperature and two humidity inputs simultaneously?
Want to view data graphically, statistically, or both? ...at the
same time?! The DewK does everything you could want—or at least
everything we could think of. Up to sixteen different display setups
can be stored and recalled at the touch of a single button. All sixteen
can be easily modified, so you get exactly what you want.
The DewK lets you view data just about
any way you like it. Both graphical data and statistical data can
be shown for temperature and humidity from one or two inputs. Modifying
any of the standard screens is easily done, so you see exactly what you
want—no more, no less.
Confidence
Hart Scientific supplies the world’s finest
measurement laboratories with world-class temperature standards.
We not only measure temperature better than anybody, we make temperature
measurements functional and productive. It’s only logical that we
extend that capability to include humidity and environmental monitoring.
Don’t compromise on your lab standards.
Buy with confidence! Measure with confidence! Record, analyze,
and store data with confidence!
LogWare III
LogWare III is a Windows® application
that retrieves, stores, and analyzes data from the DewK. LogWare
can import data batches from PC cards or directly from the DewK’s memory.
In addition, LogWare can read data in real time via an RS-232 cable.
Real-time data may be logged from one or both of a DewK’s sensors, providing
up to two temperature and two humidity inputs.
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All data is stored in a single database
and is easily retrievable based on date and time ranges and sensor identifiers
(which can be modified to indicate locations). Configurable user
accounts and access levels can ensure appropriate security and integrity
of all stored data.
Real-time data may be viewed in customizable
graphic and statistical formats. Graphs can be displayed for both
temperature and humidity for one or both sensor inputs in user-selectable
time-increments. A variety of critical statistical functions can
also be shown for each input, including min, max, average, and standard
deviation. Alarm settings accompany downloaded or real-time data
and can be highlighted in the graphs and in the displayed statistics.
Alarm events can also be triggered from the software. |
For previously stored data, LogWare allows
onscreen viewing of raw data. It also exports data easily to file
formats that can be viewed in Excel or other common spreadsheet and database
programs. It’s hard to say which is more versatile: the DewK or LogWare
III. This could well be the amazingest combination we’ve ever produced!
Ordering
Information
| 1620-S |
The “DewK” Thermo-Hygrometer
(includes standard-accuracy DewK probe,
wall mount bracket, and RS-232 cable) |
| 1621-S |
The "DewK" Thermo-Hygrometer,
Standard Accuracy Value Kit
(includes standard-accuracy DewK probe,
wall mount bracket, and RS-232 cable, standard accuracy spare probe
kit (2627-S) and 9936 LogWare III, single-PC license) |
| 2626-S |
Spare Probe, 1620-S
DewK |
| 2627-S |
Spare Probe Kit,
1620-S
(includes standard-accuracy DewK probe,
probe case, probe wall mount bracket,
and 25-foot [7.6 m] extension cable) |
| 1620-H |
The “DewK” Thermo-Hygrometer,
High Accuracy
(includes high-accuracy DewK probe, wall
mount bracket, and RS-232 cable) |
| 1621-H |
The "DewK" Thermo-Hygrometer,
High Accuracy Value Kit
(includes high-accuracy DewK probe, wall
mount bracket, and RS-232 cable, high accuracy spare probe kit (2627-H)
and 9936 LogWare III, single-PC license) |
| 2626-H |
Spare Probe, 1620-H
DewK |
| 2627-H |
Spare Probe Kit,
1620-H
(includes high-accuracy DewK probe, probe
case, probe wall mount bracket,
and 25-foot [7.6 m] extension cable) |
| 2628 |
Cable, 25-foot
(7.6 m) extension cable |
| 2629 |
Cable, 50-foot
(15.2 m) extension cable |
| 2632-64 |
PC Card (PCMCIA),
64 MB |
| 2607 |
Protective Case,
Spare Probe |
| 9328 |
Protective Case,
1620
(includes space for the DewK, two probes,
an extra PC Card, RS-232 cable, and power cord) |
| 2361 |
Spare Power Supply,
100–240 VAC to 12 VDC |
| 9936-S |
LogWare III, single-PC
license |
| LIC-9936 |
LogWare III License
(for additional PCs) |
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