DS1923

DS1923 Hygrochron Temperature + Humidity Logger

Logs relative humidity — 0–100 % RH alongside temperature, from one stainless can.

Temperature alone does not explain condensation, mould growth, corrosion or a delaminated tablet coating — humidity does, and the DS1923 is the device in this range that measures it. Both channels are logged to the same 8 KB memory against one timestamp, so you never have to correlate two devices' clocks after the fact. Humidity resolves to 0.04 % RH at 12-bit, temperature to 0.0625 °C, and 64 bytes of on-chip calibration data let the software correct both channels (all per the original manufacturer's datasheet; confirm for the supplied version). A candidate for pharmaceutical storage, museum and archive monitoring, electronics warehousing and any dispute where "it got damp" has to become a number.

Ordering information

MOQ	Confirmed by model and order when quoting
Preparation time	Availability and lead time are confirmed by model and order when quoting
Packing	Confirm pack quantity, protection and labelling for the selected model.
Samples	Sample quantity, fees and shipping are confirmed for the selected model.
Payment	Agree payment terms and the payee in the quotation and invoice.
Shipping	Confirm the shipping method, cost and timing for your destination and order.
Customization	State ROM, colour, marking and packing needs; feasibility and cost require confirmation.

Why this model

The humidity logger of the range

This is not a better temperature logger — it is a different measurement. The other loggers here record temperature history only; the DS1923 also records the moisture history, on the same timestamp, from the same stainless can. If your damage claims involve condensation, mould, corrosion, caking or swollen packaging, temperature alone may not settle the argument, and more accuracy on the other models will not change that. Note the narrower −20 °C lower limit: for deep-frozen goods, consider a DS1922L or DS1925 instead.

Key features

Original DS1923 reference: combined temperature and humidity logging with 8 KB of log memory.
The original supports separate temperature/humidity alarms and configurable sampling; enabled channels and resolution determine recording capacity.
Match the mission to the datasheet’s safe humidity/temperature operating region; ask whether calibration and environmental data are available for the quoted unit.

Specifications

Chip / compatibility	DS1923 · family code 41h · digital humidity + temperature
Memory	8 KB data log = 8192 readings (8-bit) or 4096 (16-bit) + 512 B user SRAM + 64 B calibration memory
Operating temperature	−20 to +85 °C · 0.5 °C (8-bit) or 0.0625 °C (11-bit) · ±0.5 °C software-corrected (−10…+65 °C) — per the original manufacturer's datasheet; confirm for the supplied version
Options	Humidity 0–100 % RH · 0.6 % RH (8-bit) or 0.04 % RH (12-bit) resolution · both channels share one timestamp (per the original manufacturer's datasheet; confirm for the supplied version)
Protocol	Sample rate 1 s to 273 h; delayed or alarm-triggered start; two-level password protection (per the original manufacturer's datasheet; confirm for the supplied version)
Package	F5 stainless can with vapour-permeable seal — keep away from condensing water and solvents

Inside the stainless can

Typical F5 can: Ø16.25 × 5.89 mm · typical F3 can: Ø16.25 × 3.10 mm

Typical construction of this can format: a stainless-steel shell, an insulating grommet separating lid from base, and the chip bonded inside. Lid = data contact, base = ground return. Wall thickness, grommet material and other construction details: confirm for the supplied version.

Which logger should you order?

The four Thermochron / Hygrochron loggers side by side — specifications per the Analog Devices datasheets.

	DS1921G	DS1922L	DS1923	DS1925
Measures	Temperature	Temperature	Temperature + humidity	Temperature
Range (per original datasheet)	−40 to +85 °C	−40 to +85 °C	−20 to +85 °C · 0–100 % RH	−40 to +85 °C
Accuracy (per original datasheet)	±1 °C	±0.5 °C	±0.5 °C · ±5 % RH	±0.5 °C
Best resolution (per original datasheet)	0.5 °C	0.0625 °C	0.0625 °C · 0.04 % RH	0.0625 °C
Log capacity	2048 readings	8192 readings (8 KB)	8192 readings (8 KB)	125,440 readings (122 KB)
Fastest sample rate	1 min	1 second	1 second	5 min
Histogram	Yes — 63 bins at 2 °C	—	—	—
Password protection	—	Two-level	Two-level	Two-level
Family code	21h	41h	41h	53h
Choose it when…	High-volume cold-chain shipments where a simple logger is enough	Process monitoring, fast excursions, tighter accuracy	Condensation, mould, corrosion — RH matters	Long ocean freight, long unattended missions

Typical applications

Cold Chain & Temperature Logging

Frequently asked questions

Does the DS1923 measure humidity?

Yes. Per the original manufacturer's datasheet, the DS1923 has a humidity channel: 0–100 % RH, ±5 % RH accuracy, resolving to 0.6 % RH at 8-bit or 0.04 % RH at 12-bit; confirm for the supplied version. Temperature and humidity are written to the same 8 KB log under a single timestamp, so the two curves are already aligned when you read them out — no correlating clocks between two separate devices.

Can the DS1923 go into a freezer or get wet?

Per the original manufacturer's datasheet its logging range starts at −20 °C (confirm for the supplied version), so for deep-frozen goods (−30 °C and below) choose a DS1922L or DS1925 instead. On moisture: the humidity sensor needs vapour to reach it, so the can is not sealed the way a plain temperature logger is — avoid condensing water, immersion, solvents and aggressive cleaning agents. Prolonged saturation above 90 % RH can also shift the reading until the sensor dries out.