WiFi-500 Sensor Series
Low-Cost WiFi Data Logging Sensors
Features• Log and store over 250,000samples• Integrated LCD screen displays
logger readings and status• Devices log and store data evenif temporarily disconnectedfrom network• Rechargeable internal lithium
polymer battery

Software• WiFi Sensor Software available
as a free download• PC-based or Cloud-based data
storage available• Software-selectable logging
settings
WiFi-500 Sensor Series wireless data loggers such as the WiFi-502 (shown above) transmit
logged data to either a host computer or a web-based Cloud account over a WiFi network.

• View, analyze, and print logged
data immediately• Export logged data to analyze/graph in Microsoft® Excel®

Overview
The WiFi-500 Sensor Series of wireless data loggers collect temperature or temperature/humidity readings and transmit the logged data over a wireless network.
Wireless transmissions reduce the need to physically collect devices and connect them to a computer. Devices can be configured wirelessly using either theWiFi Sensor Software on a PC or using the Cloud interface.

• Instant email alerts (Cloudonly)• Supports Windows® 10/8/7(32/64-bit)

Ideal for site monitoring, HVAC, agriculture/horticulture, food industry,
temperature/humidity-sensitive environments, and many other applications.
All Cloud features are available on web-enabled PCs, smart phones, tablets, andMac® computers. All devices comply with the IEEE 802.11b WiFi specification,and support bandwidths up to 11 Mbps.

WiFi-500 Sensor Series
ModelChannels

Measurement Type

Sample Rate

Data Transmission
to PC/CloudMemoryFeatures

WiFi-501

1Temperature

10 s to 12 hr

Every 1 minute toevery 24 hours

More than
250,000 samples—WiFi-501-TP

1Temperature

10 s to 12 hr

Every 1 minute to
every 24 hours

More than
250,000 samples

Detachable
thermistor probe

WiFi-502

2

Temperature,Humidity

10 s to 12 hr

Every 1 minute to
every 24 hours

More than
250,000 samples(combined temperature
and/or humidity)—

Measurement Computing(508) 946-5100

1

info@mccdaq.com

mccdaq.com

WiFi-500 Sensor Series
General Information
WiFi Connectivity to PC or Cloud
All WiFi-500 Sensor Series loggers comply with the IEEE
802.11b WiFi specification, and support bandwidths up to11 Mbps.
Once the device connects to a network, it can be set up to store
data locally on the PC or on a local network, or remotely on
the web-based Cloud. The device can then be placed anywhere
within range of the network.*
The device logs data and transmits the data wirelessly to the PC
or Cloud account. The device settings can also be changed over
the wireless connection.
If the device temporarily loses WiFi connectivity, it continues
logging samples until it regains communication with the network.
For example, after losing its WiFi connection, a WiFi‑500 Sensor
Series logger continues logging data for up to 60 days with a
10 second sample rate setting.

Home screen

Maximum readings

Minimum readings

WiFi signal strength

Cloud Access Using Any Web-Enabled Device
Users can create and access a Cloud account fromwww.wifisensorcloud.com. All Cloud features are available on
web-enabled devices – PC, smart phone, tablet, and Mac®.

Rechargeable Batteries
WiFi-500 Sensor Series data loggers include a low-powered,rechargeable battery. When set up to use typical sample rates– such as once every 60 seconds – the device can operate forover one year. The battery can be recharged by connecting theincluded USB cable it to a computer or to a USB 5 V wall adapter.
For an overview of each account type, refer to the Cloud
Account Comparison table on page 3.

Sleep Mode for Battery Optimization

Real-Time LCD Screen

WiFi-500 Sensor Series devices include a sleep mode feature tooptimize battery performance. Connected devices automaticallygo into sleep mode when the software is not running.

WiFi-500 Sensor Series data loggers feature a built-in highcontrast LCD screen for real-time display of logged data andthe following information:•WiFi signal strength•

Maximum and minimum logged values since the device
was last reset•

Alarm indicator•

Battery charge

Each device continues to log data to its onboard memory whilein sleep mode. When they detect that the software is runningagain, devices reconnect and transmit all data stored in theirmemory to the computer.

* Typically, expect a 30 m range in an office-like environment, where obstructions can degrade RF transmissions. In line-of-sight or outdoor environments,a 100 m transmission is possible. To increase the range of the device, install a
WiFi extender between the base router or access point and a device that is not
close enough to receive acceptable service or one that is on the other side of abarrier.

Measurement Computing(508) 946-5100

2

info@mccdaq.com

mccdaq.com

WiFi-500 Sensor Series
Software Information
WiFi Sensor Software

determine how often data is transmitted to the host PC or Cloudaccount. For example, if the sample transmission frequency is set
to 1 minute and the sample rate is set to 10 seconds, the device
transmits six samples to the computer every minute:

The WiFi Sensor Software for use with WiFi-500 Sensor Series
devices is available as a free download. This easy‑to‑use software
application allows users to set up a WiFi connection, set thesample rate and WiFi data transmission rate, and set alarms
and temperature scale.

60 seconds ÷

Support for Multiple Devices
The maximum number of devices supported for local PC
data storage depends on the capabilities of the PC.

•The maximum number of devices supported for Clouddata storage depends on the type of Cloud account being
used.

Cloud Account Comparison•

view logged data in graph or tabular format•

export logged data to .csv or .pdf*•

export graph to .jpg or .pdf†•

export data and graph to Excel® (PC interface only)•change device settings•

display device properties•

delete device readings or a device from the WiFi software/
network•

print a graph•reset device alarm state•mute audible software alarm (PC interface only)•

download device data over USB if WiFi transmission is notavailable•

copy data files for processing by third-party software

Account TypeFreePersonal*= 6 samples

Users can select from among all WiFi-500 Sensor Series devices
that were configured on the same PC or Cloud account andperform the following operations over WiFi:

Cloud features for each account type are compared in the following table.

Feature10 seconds

Viewing Device Settings and Readings

Multiple devices can be set up to store data on either a PC oron the Cloud.
•1 sample

Professional*

Maximum
Devices2

Unlimited

Unlimited

MaximumLength of Data
Storage

45 days

Unlimited

Unlimited

Maximum
Email Alerts

100per month

Unlimited

UnlimitedOn the Cloud, users can also perform the following operations:

Email Alert
Recipients

5per device

5per device

100per device•Export Data(CSV)

–

4

4

set up email alerts for alarms, AC power outage, low battery charge, loss of network connection, and other devicespecific problems•Print Data

–

4

4

display and export an audit trail to provide a documentary
record of changes (depends on type of Cloud account)add comments to annotate data in tabular format andevent logs

Audit Trail––4•Multi-User
Administration––

4

Locations andTime Zones––

4

The following data is graphed on both the PC and Cloud interfaces:•temperature samples* Personal and Professional accounts require a monthly fee•

relative humidity samples‡

Sample and Transmission Rates•

dew point

Use the WiFi Sensor Software to configure a device with sample
rates ranging from 10 seconds to 12 hours, depending on theapplication and length of data collection needed. The sample
rate controls the rate at which data is acquired and stored on
the device.

•high and low temperature alarm settings•high and low relative humidity alarm settings

Users can also set how often the device transmits data to thehost computer. Transmission rates range from every one minuteto every 24 hours.

* Export logged data to .pdf only available for PC interface. Export to .csv only
available with Personal and Professional Cloud accounts.
† Export graph to .jpg only available for PC interface. Export to .pdf only available with Personal and Professional Cloud accounts.
‡ For WiFi-500 devices that support humidity measurements, such as the WiFi-502.

The sample rate and transmission rate settings work together toMeasurement Computing(508) 946-5100

3info@mccdaq.com

mccdaq.com

WiFi-500 Sensor Series
Software Information
Email/Text Notifications (Cloud Only)

Data peaks (normally averaged out by the software) and audit
checks can also be displayed on Cloud graphs.

Depending on the type of Cloud account, users can enter fromfive to 100 email recipients to send notifications about any thefollowing device events:

Once a graph is displayed, users can zoom in and out to view selectdata segments. Whole data log sessions or segments of a session
can be saved to comma-delimited text file (.txt). Data and graphcan also be exported for immediate display in Microsoft Excel.
Graph on PC•

Alarm conditions - Notify recipients when high/low
alarm conditions occur.

•AC power - Notify recipients about a change in the stateof AC power connected to your device. The Cloud sends
emails when power fails and when power is restored.

•Battery charge - Notify recipients when the battery charge
in a device is low and needs recharging.

•Loss of connection - Notify recipients when regulartransmissions from the device are interrupted and instructthem how to troubleshoot the problem.

•Device problems - Notify recipients of device problems(probe disconnected, readings out of range, and so on).

Notifications can also be set up as text-only messages to send
to mobile devices.

Applications
WiFi-500 Sensor Series devices are suitable for a variety of applications, such as:Graph on Cloud•site monitoring (buildings, server rooms)

•HVAC

•

agriculture and horticulture•

food industry (manufacturing and storage to distribution
and retail)•sensitive environments, such as medical vaccines, historical artifacts, and wine storage

Users can graph and display WiFi-500 Sensor Series readings using
either a PC or the Cloud interface.

Measurement Computing(508) 946-5100

4

info@mccdaq.com

mccdaq.com

WiFi-500 Sensor SeriesSpecifications
Specifications

WiFi-501-TP

All specifications are subject to change without notice.
Typical for 25 °C unless otherwise specified.

The following specifications apply to the WiFi-501-TP temperature logger and its
detachable thermistor probe.

All WiFi-500 Sensor Series Devices

Temperature

Thermistor probe measurement range: –40 °C to 125 °C (–40 °F to 257 °F)
Temperature accuracy
Typical: ±0.6 °C (-10 to +70°C)
Maximum: ±1.0 °C (-40 to +125°C)
Temperature measurement resolution: 0.1 °C (0.2 °F) typ
Temperature display resolution: 0.1 °C typ
Thermistor probe temperature accuracy: ±0.5ºC (-10 °C to 70 °C), ±1.0ºC(-40 °C to 125°C)
Alarm threshold range (software-selectable): –40 °C to 125 °C (–40 °F to 257 °F)
range for both high alarms and low alarms

The following specifications apply to all WiFi-500 Sensor Series data loggers.

USB Specifications

USB device type: USB 2.0 (full speed)Device compatibility: USB 1.1, USB 2.0, USB 3.0
Micro-USB type B connector (bottom of enclosure): Connects device to computer
using included 25 in. Micro-USB cable

Wireless Connectivity

Connects to IEEE 802.11b WiFi networks running WEP 64 bit, WEP 128 bit,
WPA-PSK, and WPA2-PSK security protocols

Data Sampling

Sample rate (software-selectable): 10 s, 15 s, 20 s, 30 s, 1 min, 2 min, 5 min,10 min, 15 min, 20 min, 30 min, 1 hr, 2 hr, 4 hr, 6 hr, 12 hr
Temperature samples: More than 250,000 maxTemperature units: °C or °F

Wireless Data Transmission

Sample transmission frequency range (software-selectable): Every 1 minuteto every 24 hours
For example, if the sample transmission frequency is set to 1 minute and thesample rate is set to 10 seconds, the device transmits 6 samples to the computer
every minute.
60 seconds ÷1 sample
10 seconds

Environmental

Main unit operating temperature range: –20 °C to 60 °C (–4 °F to 140 °F)
Note: At temperatures below –20 °C (–4 °F), the LCD may exhibit a slower
response time of approximately 10 seconds
Thermistor probe operating temperature range: –40 °C to 125 °C (–40 °F to 257 °F)
Moisture and dust protection
Main device enclosure: IP43 (dust and water spray)
Thermistor probe: IP67 (dust and water immersion)= 6 samples

LCD Status Indicators

The high-contrast LCD screen cycles through different information displays when
the user presses the button on the front of the device (refer to Real-Time LCD
Screen for screen examples).

Mechanical (Thermistor Probe)

Length: 1 m (39.4 in.)Audio plug: 3.5 mm (0.14 in.), gold-plated
End cap: Stainless steel

PowerUSB supply voltage: 4.5 V to 5.5 V
Power source: Internal lithium polymer battery recharges over USB connection
Battery lifespan: Greater than 6 months typNote: Battery lifespan depends on how often the device transmits data to thecomputer using WiFi. The more frequent the transmission, the shorter thebattery life.
Battery charge/discharge cycles: More than 300
Battery charging temperature range: Battery safely recharges when the device
is operating between 0 °C to 40 °C (32 °F to 104 °F). It is protected against
charging outside this temperature range. Sensor samples may be inaccurate
during battery charging.

WiFi-502

The following specifications apply to the WiFi-502 temperature and humidity logger.

TemperatureMeasurement range: –20 °C to 60 °C (–4 °F to 140 °F)
Temperature accuracy
Typical: ±0.3°C (±0.6°F); +5 °C to +60 °C (+41 °F to +140 °F)
Maximum: ±0.8 °C (±1.6°F); -20 °C to +60 °C (-4 °F to +140 °F)
Temperature measurement resolution: 0.1 °C (0.2 °F) typ
Temperature display resolution: 0.5 °C typAlarm threshold range (software-selectable): –20 °C to 60 °C (–4 °F to 140 °F)
range for both high alarms and low alarms

Mechanical

Main enclosure dimensions (L × W × H): 82 × 70 × 36 mm (3.22 × 2.75 × 1.41 in.)WiFi-501

The following chart gives an indication of expected tolerance in temperature
measurements across the full measurement range.

The following specifications apply to the WiFi-501 temperature logger.

Temperature

Measurement range: –20 °C to 60 °C (–4 °F to 140 °F)
Temperature accuracy: ±0.5 °C (±0.1°F)
Temperature measurement resolution: 0.1 °C (0.2 °F) typ
Temperature display resolution: 0.5 °C typ
Alarm threshold range (software-selectable): –20 °C to 60 °C (–4 °F to 140 °F)
range for both high alarms and low alarms

Data Sampling

Sample rate (software-selectable): 10 s, 15 s, 20 s, 30 s, 1 min, 2 min, 5 min,10 min, 15 min, 20 min, 30 min, 1 hr, 2 hr, 4 hr, 6 hr, 12 hr
Temperature samples: More than 250,000 max
Temperature units: °C or °F

Environmental

Main unit operating temperature range: –20 °C to 60 °C (–4 °F to 140 °F)
Note: At temperatures below –20 °C (–4 °F), the LCD may exhibit a slower
response time of approximately 10 seconds
Moisture and dust protection: IP55 (dust and water jets)

Measurement Computing(508) 946-5100

5

info@mccdaq.com

mccdaq.com

WiFi-500 Sensor Series
Ordering
Order Information

Relative Humidity

Measurement range: 0% RH to 100% RH
Humidity accuracy (@ 25 °C)
Typical: ±2%RH ((10%RH to 90%RH)
Maximum: ±0.8 °C (±1.6°F); -20 °C to +60 °C (-4 °F to +140 °F)
Humidity measurement resolution: 1.0% RH
Humidity display resolution: .0% RH
Alarm threshold range: 0% RH to 100% RH (high and low alarms)
The following chart gives an indication of expected tolerance in humidity measurements across the full measurement range.

Part No.

Description

WiFi-501

Rechargeable battery-powered WiFi temperature
sensor with LCD. Includes 25 in. Micro-USB cable
and wall mounting bracket.

WiFi-501-TP

Rechargeable battery-powered WiFi temperature
sensor with LCD and detachable thermistor probe.
Includes 25 in. Micro-USB cable and wall mounting
brackets for main enclosure and probe.

WiFi-502

Rechargeable battery-powered WiFi temperature/humidity sensor with LCD. Includes 25 in. Micro-USB
cable and wall mounting bracket.

Each WiFi-500 Sensor Series device ships with a Micro-USB cableand a wall mounting bracket.

Data Sampling

Sample rate (software-selectable): 10 s, 15 s, 20 s, 30 s, 1 min, 2 min, 5 min,10 min, 15 min, 20 min, 30 min, 1 hr, 2 hr, 4 hr, 6 hr, 12 hr
Temperature and humidity samples: More than 250,000
Temperature units: °C or °F

EnvironmentalOperating temperature range: –20 °C to 60 C (–4 °F to 140 °F)
Note: At temperatures below –20 °C (–4 °F), the LCD may exhibit a slower
response time of approximately 10 seconds
Moisture and dust protection: IP55 (dust and water jets)

Measurement Computing
WiFi-500-Sensor-Series-data(508) 946-5100

6

info@mccdaq.com

mccdaq.com
June 2017. Rev 7© Measurement Computing Corporation