MODEL 314 DATALOGGING HUMIDITY TEMPERATURE METER
1
1.0 Introduction This instrument is a dual channel, recording digital Humidity / Temperature meter providing
simultaneous display of ambient humidity and temperature on the first channel, and a wide
range temperature only measurement on the second channel. The first channel incorporates
a polymer capacitive humidity sensor and a semiconductor temperature sensor (T1) in a
detachable probe. The second channel employs a Type K thermocouple that complies with
the NIST and IEC584 temperature/voltage tables for Type K thermocouples. The instrument’s
internal memory can store up to 16312 records in any number of recording intervals. It is
equipped with a RS232 interface for bi-directional communication with a PC.
2.0 Specifications Measurement Range: Humidity: 0% - 100%RH
Temperature: T1: -20°C - +60°C, -4°F - +140°F
T2: -200°C - +1370°C, -328°F - +2498°F
Accuracy: Humidity: ±2.5% RH at 25°C
Temperature: T1: ±0.7°C, ±1.4°F
T2: See table below.
at ( 23 ± 5°C )
Range Accuracy
-200°C - 200°C ±(0.3% reading + 1°C)
200°C - 400°C ±(0.5% reading + 1°C)
400°C - 1370°C ±(0.3% reading + 1°C)
-328°F - -200°F ±(0.5% reading + 2°F)
-200°F - 2498°F ±(0.3% reading + 2°F)
Temperature Coefficient:
For ambient temperatures from 0°C -18°C and
28°C - 50°C, for each °C ambient below 18°C o
r
above 28°C add the following tolerance into the
accuracy spec.
0.01% of reading + 0.03°C
(0.01% of reading + 0.06°F)
Note:
The basic accuracy specification does not include the error of the probe. Please refer to the probe accuracy
specification for additional details.
Resolution: Humidity: 0.1%RH
Temperature: T1: 0.1°C, 0.1°F
T2: -200°C - 200°C: 0.1°C; 200°C -1370°C: 1°C
-200°F - 200°F: 0.1°F; beyond this range: 1°F
Sensor Inputs: Channel 1: Detachable probe with humidity and temperature (T1) sensors
Channel 2: Type K Thermocouple (T2)
Input Protection at Thermocouple Input (T2): 60V DC, or 24Vrms AC
Display: Triple 4 Digit Display plus Indicators, see Section 3.0
Response Time: Humidity: 75 seconds in slowly moving air
Temperature: 40 seconds in slowly moving air (T1)
Digital Output: Bi-directional RS232. Software and Cable included
Power requirement: 9 Volt Battery, NEDA 1604 or JIS 006P or IEC6F22
Battery Life: Approx. 100 hours with alkaline battery; Low battery indication
Operating Conditions:
x Operating Temperature and Humidity: 0°C - 50°C (32°F - 122°F); 0 - 90% RH
Non-condensing
x Storage Temperature and Humidity: -10°C - 60°C (14°F - 140°F); 0 - 80% RH
Non-condensing
x Altitude up to 2000 meters (6500 feet)
Dimensions: Meter = 186×64×30 mm (7.3×2.5×1.2 inches)
Probe = 190 mm long×15 mm diameter (7.5×0.6 in)
Weight: Approx. 320g (10.8 oz)
Accessories: Type K Wire Thermocouple Probe, Battery, Carrying Case, Humidity Probe
Holder, Instruction Manual, Software, RS232 cable
Option: AC Adapter: 9VDC ±15%, 100mA; Plug Diameter: 3.5mm×1.35mm