OM-22-Series

Supported Applications

The OM-22, OM-23, and OM-24 are Multi-Use PDF Temperature and Humidity Data Loggers designed for monitoring temperature, or temperature with humidity, in applications subject to quality-control requirements. They are plug-and-play devices with a USB 2.0 interface and require no special software or driver to program the logger or download data.

On completion of a logging run each device generates PDF and Excel reports containing a summary, graph, and detailed data list, which suits cold-chain audits, warehouse and laboratory environmental monitoring, and shipment verification. Because the loggers are reusable, they fit repeated study cycles rather than one-time trips.

Operating Conditions & Performance

Across the series the temperature channel uses an NTC thermistor and covers -30 to 70°C (-22 to 158°F) with an accuracy of ±0.5°C and a resolution of 0.1°C, 0.1°F. The OM-24 adds a capacitive relative-humidity channel spanning 0.1 to 99.9% RH.

• Humidity accuracy (OM-24): ±3% RH from 10 to 90% RH @ 25°C, ±5% RH elsewhere.
• Humidity resolution (OM-24): 0.1% RH.
• Sampling interval: 30 seconds, 5, 10, 30, 60, 90, 120 minutes.
• Storage temperature: -40 to 85°C (-40 to 185°F).
• Power: Two 3V CR2032 lithium coin cell batteries.
• Weight: 90 g (3.2 oz).
• Dimensions: 110 L x 45 H x 17 mm D (4.3 x 1.8 x 0.7").

The loggers operate as multiple-use devices, provide LED indication of REC and high/low alarm status, and support single, cumulative, or disabled alarm types. All three models carry CE, RoHS, and EN 12830 Compliance.

Configuration Options

The three models share the same core temperature performance but differ in what they sense, how they store data, and how they are sealed:

OM-22 — Temperature

The OM-22 records ambient temperature only, dedicating its full 48,000 points of memory to the internal temperature channel. It carries the highest enclosure rating in the family, NEMA 6 (IP67).

OM-23 — Temperature + External Temperature

The OM-23 adds an input for an external temperature probe, splitting memory as 24000 Temp + 24000 ext. Temp. It is rated NEMA 4 (IP65). The external probe is sold separately as the OM-23-TP1 (with handle) or OM-23-TP2 (without handle).

OM-24 — Temperature + Humidity

The OM-24 pairs the internal temperature channel with a capacitive relative-humidity sensor measuring 0.1 to 99.9% RH, storing 24000 Temp + 24000 Humidity. It is rated NEMA 4 (IP65), not including the sensor area.

Key Product Differences

The model lineup and its external probe accessories are:

• OM-22 — multi-use PDF temperature data logger, ambient temperature.
• OM-23 — multi-use PDF temperature data logger, ambient temperature plus input for external temperature probe (external probe sold separately).
• OM-24 — multi-use PDF temperature and humidity data logger.
• OM-23-TP1 — external temperature probe (with handle) for OM-23.
• OM-23-TP2 — external temperature probe (without handle) for OM-23.