OM-EL-WIFI-Series

Supported Applications

The OM-EL-WIFI Series comprises high accuracy wireless temperature and humidity data loggers that measure temperature and/or humidity and transmit their readings over WiFi to a PC for viewing and analysis with free software. Because the family spans single- and dual-channel models with internal sensors, removable thermistor probes, and thermocouple inputs, it covers monitoring tasks ranging from ambient room and storage conditions through to demanding process points reached with an external probe.

Every logger runs on a rechargeable internal lithium polymer battery and carries an integrated LCD display, so readings are visible at the device as well as at the PC. The enclosure is rated IP55 for use in dusty or splash-prone locations, and with a mounting bracket the unit measures 97.3 H x 71.3 W x 26.36 mm D (3.8 x 2.8 x 1.04") and weighs 43 g (1.5 oz), keeping it compact for wall or bench mounting.

Humidity models resolve the full 0 to 100% RH band, thermistor-probe models reach process temperatures of -40 to 125°C (-40 to 257°F), and thermocouple-input models accept Type K, Type J, and Type T sensors with a display range of -99.9 to 999.9°C or °F, so the series suits cold storage, cleanrooms, laboratories, and industrial process monitoring alike.

Operating Conditions & Performance

The data loggers operate over an ambient range of -20 to 60°C (-4 to 140°F). Models fitted with a removable thermistor probe extend measurement at the probe to -40 to 125°C (-40 to 257°F), with the probe clip rated for -40 to 100°C (-40 to 212°F). Thermocouple-input models read Type K over -200 to 1350°C (-328 to 2462°F) and Type J over -200 to 1100°C (-328 to 2174°F).

Temperature performance varies by model, reflecting standard and high accuracy (PLUS) builds:

• OM-EL-WIFI-TH: ±0.3°C (±0.5°F) over 5 to 60°C, with a maximum error of ±0.8°C (±1.4°F) over -20 to 60°C; resolution 0.5°C (1.0°F) display and 0.1°C (0.18°F) recorded.
• OM-EL-WIFI-TH-PLUS: ±0.2°C (±0.4°F) over 5 to 60°C, with a maximum error of ±0.8°C (±1.4°F) over -20 to 60°C; resolution 0.5°C (1.0°F) display and 0.01°C (0.01°F) recorded.
• OM-EL-WIFI-TP: ±0.6°C, maximum ±1.0°C; resolution 0.1°C (0.1°F).
• OM-EL-WIFI-TP-PLUS: ±0.1°C, maximum ±0.3°C; resolution 0.01°C (0.01°F).
• OM-EL-WIFI-DTP-PLUS: ±0.2°C, maximum ±0.6°C; resolution 0.01°C (0.01°F).

Humidity models resolve 1% RH and, on the OM-EL-WIFI-TH, hold an accuracy of ±2.5% RH over 20 to 80% RH and a maximum of ±5.0% RH over 0 to 100% RH; the OM-EL-WIFI-TH-PLUS improves this to ±2.5% RH over 10 to 90% RH and a maximum of ±4.0% RH over 0 to 100% RH. The OM-EL-WIFI-TH stores 500,000 temperature and 500,000 humidity readings, while thermistor-probe models store 1,000,000 temperature readings.

Recharging is handled through a USB port. The battery charges safely when the unit is operating between 0 to 40°C (32 to 104°F) and is protected against charging outside this range; readings may be inaccurate during charging. All models are CE and FCC marked and carry a 1 year warranty.

Configuration Options

The series is organized around sensor style and a standard-versus-PLUS accuracy tier, following the model number structure OM-EL-WIFI — MODEL — PLUS.

Internal-sensor models

OM-EL-WIFI-T and OM-EL-WIFI-T-PLUS use an internal temperature sensor. Both cover -20 to 60°C (-4 to 140°F); the standard T reads ±0.5°C over -10 to 50°C and resolves 0.1°C (0.1°F), while the T-PLUS resolves 0.01°C (0.01°F) for finer recording. The OM-EL-WIFI-TH and OM-EL-WIFI-TH-PLUS add internal humidity measurement across 0 to 100% RH.

Removable thermistor-probe models

OM-EL-WIFI-TP, OM-EL-WIFI-TP-PLUS, and the dual-channel OM-EL-WIFI-DTP-PLUS use a high-temperature flexible cable with a 304 SS end cap, extending measurement to -40 to 125°C (-40 to 257°F). The TP has a 50 cm (19.7") cable and a 25 x 4.8 mm dia (1 x 0.188") end cap, whereas the TP-PLUS and DTP-PLUS use a longer 300 cm (118.1") cable and a 75 x 4.95 mm dia (2.95 x 0.19") end cap. The PLUS builds sharpen accuracy from the TP's ±0.6°C down to ±0.1°C on the TP-PLUS, and the DTP-PLUS adds a second probe channel at ±0.2°C.

Thermocouple-input models

OM-EL-WIFI-TC is a single-channel thermocouple-input logger and OM-EL-WIFI-DTC is a dual-channel version. The TC includes one Type K beaded wire thermocouple and the DTC includes two Type K beaded wire thermocouples. Both accept Type K and Type J sensors, reading -200 to 1350°C (-328 to 2462°F) and -200 to 1100°C (-328 to 2174°F) respectively.

Key Product Differences

The OM-EL-WIFI Series offers nine loggers, differentiated by sensing method, channel count, and accuracy tier:

• OM-EL-WIFI-TH — WiFi temperature and humidity data logger.
• OM-EL-WIFI-TH-PLUS — high accuracy WiFi temperature and humidity data logger.
• OM-EL-WIFI-TP — WiFi temperature data logger with removable thermistor probe.
• OM-EL-WIFI-TP-PLUS — high accuracy WiFi temperature data logger with removable thermistor probe.
• OM-EL-WIFI-DTP-PLUS — high accuracy dual channel WiFi temperature data logger with removable thermistor probes.
• OM-EL-WIFI-T — WiFi temperature data logger with internal temperature sensor.
• OM-EL-WIFI-T-PLUS — high accuracy WiFi temperature data logger with internal temperature sensor.
• OM-EL-WIFI-TC — WiFi thermocouple input temperature data logger.
• OM-EL-WIFI-DTC — WiFi dual channel thermocouple input temperature data logger.

Supporting accessories extend the series:

• OM-EL-WIFI-ADAPTOR — USB power adaptor for recharging any OM-EL-WIFI Series data logger (120 Vac input, 5 Vdc/1A output via standard size USB type A connector).
• OM-EL-PROBE-EXT-CAB-1.5M — thermistor probe extension cable, 1.5 m (5') for OM-EL-WIFI-TP and OM-EL-WIFI-TP-PLUS.
• OM-EL-PROBE-EXT-CAB-5M — thermistor probe extension cable, 5 m (16.5').
• OM-EL-PROBE-EXT-CAB-10M — thermistor probe extension cable, 10 m (33').
• OM-EL-WIFI-ALERT — audible and visual alarm for OM-EL-WIFI Series data loggers.