Datalogger and Sensor Accuracy Specifications

Data Logger Technical Specifications

Casing Polycarbonate, watertight to IP68 Humidity loggers splash proof from top
Size 65 × 31 × 106 mm
Weight 115 g
Ambient -40 + 85 °C
Battery 1 × ½AA, 3.6V
T-TEC 6: Expected battery life: 3-4 years
T-TEC 7: Expected battery life: 2 years, Low battery warning on the display
Sensor (see sensor specifications) Temperature: Precision Thermistor or Pt100
Humidity: capacitive precision
Memory E model: 12,000 to 25,000 sets of measurements
C model: 10,600 sets each sensor
F model: 10,600 sets each sensor (21,200 if only one)
A & P: 20,000 to 60,000 sets of measurements
Interface Special interface cable to the serial port and/or special interface cable to USB Port
Security ID Permanent serial number
Warranty 1 Year (not incl. sensor)
Resolution Temperature: Better than 0.1 °C (see sensor specifications)
Humidity: Better than 0.1%RH

Special Alarm functions

T-TEC 6: Audio alarms, T-TEC 7 visual alarms

When starting the logging, one or two alarms may be set as minimum and/or maximum alarms. A period of grace may be set in minutes. Alarms can be programmed to reset themselves once a day at a chosen time. Type

C loggers

(For temperature and Humidity) have alarm functions for temperature only.

Special Relay Output

Some types may be supplied with optional relay output. Change-over relay, all three contacts available. Contacts: Gold clad silver contacts. Nominal switching capacity (Resistive load) 1A/30V DC, 0.5A 125V AC

Thermochron™ data logger specifications

Casing Stainless Steel, Polypropylene seal
Size 17.35mm diameter 5.9mm height
Weight 3.2 g
Ambient -40 to 85 °C. Should not be exposed to temperatures in excess of 70 °C for a prolonged time.
Battery Built-in: Non-replaceable
Estimated lifetime: 5-7 years, depending on:
·         ambient temperature·         number logs taken·         resolution (DS1922 and DS1923)·         Logging interval (DS1922 and DS1923)
Sensor Built-in, semiconductor
Memory DS1921: 2,048 logs
DS1922: 4096 or 8192 (depending on resolution)DS1923: 2,048 or 4,096 (depending on resolution)
Interface
USB adaptor
Security ID Engraved unique serial number on the case. This number also embedded in internal electronics.
Resolution 1921: ±0.5 °C
1922: ±0.5 °C (low resolution) or ±0.0625 °C (high resolution)
1923: ±0.5 °C (low resolution) or ±0.0625 °C (high resolution)
Accuracy ±1 °C from -20 + 70 °C, at time of calibration at factory.
Time Accuracy Maximum 8 minutes per month over full temperature range.

Thermochron is a registered trademark of Maxim Integrated Products.

Data Logger Technical Specifications

Sensor Specifications

Internal and Fixed External Thermistor Sensor Accuracy

Range Accuracy
-40 to 0 °C ± 0.3 °C
0 to 70 °C ± 0.2 °C
70 to 85 °C ± 0.3 °C
85 to 100 °C ± 0.5 °C

Fixed External Humidity Sensor Accuracy

10-90 % ± 2% RH, Compensated for -5 + 60 °C ambient temperature

Remote Thermistor Sensors’ Ranges and Resolutions

Two different external temperature sensors available

Type Ranges Resolution Accuracy
T1 – 40 to 85 °C < 0.1 °C As for built-in sensor
T2 -100 to 20 °C < 0.1 °C -90 to 20 °C ± 0.8 °C
-100 to -90 °C ± 1.0 °C

Remote Pt100 Sensor

Four different temperature ranges available.

Type Ranges Resolution Accuracy
A -200 + 120 °C 0.2 °C -200 – 100 °C ± 2.0 °C
-100 – 40 °C ± 1.0 °C
-40 + 120 °C ± 0.5 °C
B -40 + 120 °C 0.1 °C -40 + 120 °C ± 0.3 °C
C -40 + 280 °C 0.2 °C -40 + 100 °C ± 0.4 °C
+100 + 200 °C ± 0.6 °C
+200 + 280 °C ± 1.0 °C

4-20 milli-Amperes input

Accuracy: ± 1% of range

Connection through supplied 2 meter cable with connector for logger.

Time Accuracy

Synchronisation up

to:

± 1 second; ± 1 minute per month.

Sensors Accuracy Ranges and Resolutions (same for all)