® 971 Temperature Humidity Meter Users Manual PN 2441047 September 2005 Rev.1, 5/06 © 2005-2006 Fluke Corporation, All rights reserved. Printed in Taiwan All product names are trademarks of their respective companies.
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Introduction W Caution To extend sensor life, keep the sensor’s protective shutter closed whenever the meter is not in use. The Fluke Model 971 (hereafter referred to as “the Meter” is a battery powered meter that measures relative humidity and temperature. Through a few easy to use controls, the Meter displays three different temperature points of the air surrounding the meter’s sensor: ambient, wet bulb, and dew point. Electrical and Safety Symbols W Important information.
971 Users Manual Display 7 1 6 2 5 4 3 bdm002f.eps No. Symbol 1 B 2 3 Low battery. Wet bulb or dew point temperature displayed. M Min Max Record enabled. MAX, MIN, Maximum, minimum, or average reading displayed. AVG 2 Meaning 4 °F, °C Temperature measurement units. 5 % RH Relative humidity measurement unit. 6 L 88 7 H Displayed reading is from memory. Memory location number. HOLD enabled. Display freezes present reading.
Temperature Humidity Meter Operation Operation Note When moving from one temperature/humidity extreme to another, allow time for the Meter to stabilize. After opening the sensor’s protective shutter, press O to turn on the Meter and start taking measurements. Temperature readings are displayed in either the Celcius (°C) or Fahrenheit (°F) scale. To switch between °C and °F, remove the battery compartment door and position the temperature scale switch to the desired scale. See Figure 1.
971 Users Manual Min Max Record When enabled, Min Max Record stores a new measurement when it is either higher or lower than a previously stored maximum or minimum measurement. Press N to start Min Max Record. M appears in the display to indicate Min Max Record mode is enabled. Note The temperature scale switch (°C/°F), Save, Recall, and Hold buttons, as well as the Automatic Power Off (APO) switch are all disabled when Min Max Record is enabled.
Temperature Humidity Meter Operation Pressing S saves the present readings to a memory location. L and the memory location number appear in the display to indicate the readings have been stored. Press W to return the display to the present reading. After all 99 memory locations are filled, each subsequent save overwrites a memory location starting with the first. To recall the readings from memory, press R.
971 Users Manual Maintenance Battery Replacement Meter power is supplied by four 1.5 V (AAA size) batteries. When B appears in the display, replace the batteries as soon as possible. To replace the batteries: 1. Back out the screw at the top of the battery door and lift the door away from the Meter. 2. Remove the four AAA batteries from the compartment. 3. Replace with four new AAA batteries, observing proper polarity as depicted on the bottom of the battery compartment. 4.
Temperature Humidity Meter Maintenance APO Enable/Disable bdm002f.eps Figure 1. Battery Compartment Cleaning W Caution To avoid damage to the case, do NOT use abrasives or solvents for cleaning the meter. Periodically wipe the case with Fluke Meter Cleaner or a damp cloth and detergent.
971 Users Manual Specifications Temperature Range: Accuracy: Resolution: Update rate: Sensor type: Relative Humidity Range: Accuracy: Resolution: Response time: Sensor hysteresis: Sensor type: Temperature Coefficient: Wet Bulb Temperature Range: Dew Point Temperature Range: 8 -20 to 60 °C (-4 to 140 °F) ±0.5 °C on 0 to 45 °C ±1.0 °C on -20 to 0 °C, 45 to 60 °C ±1.0 °F on 32 to 113 °F ±2.0 °F on -4 to 32 °F, 113 to 140 °F 0.1 °C /°F 500 ms NTC 5 to 95 % RH ±2.5 % RH (10 to 90 % RH) @23 °C (73.4 °F) ±5.
Temperature Humidity Meter Specifications Memory: Power: Battery Life: Environment Storage: Operating: 99 data points 4 each AAA batteries, 24A, LR03 200 hours -20 to 60 °C at <80 % R.H.
971 Users Manual LIMITED WARRANTY AND LIMITATION OF LIABILITY This Fluke product will be free from defects in material and workmanship for one year from the date of purchase. This warranty does not cover fuses, disposable batteries, or damage from accident, neglect, misuse, alteration, contamination, or abnormal conditions of operation or handling. Resellers are not authorized to extend any other warranty on Fluke’s behalf.
