Lutron Electronics PHB-318 - User Manual

HUMIDITY/TEMP.
BAROMETE
R
Model : PHB-318
Y
our purchase of this
METER marks a step
forward for you into the
field of precision
measurement. Although
this METER is a complex
and delicate instrument,
its durable structure will
allow many years of use i
f
proper operating
techniques are developed.
Please read the following
instructions carefully and
always keep this manual
within easy reach.
OPERATION MANUAL

Summary

Features

Specifications

General Specifications

Details display, units, circuit, sensor structure, data hold, memory recall, sampling time, power off, operating conditions, power supply, weight, and dimensions.

Electrical Specifications

Provides detailed electrical specs for Humidity/Dew Point and Barometer measurements including range, resolution, and accuracy.

Temperature Specifications

Details the measuring range, resolution, and accuracy for temperature measurements.

Front Panel Description

Probe Head and Sensor

Describes the probe head and the integrated Humidity/Temperature sensor.

Control Buttons

Details the Power, Hold/Unit, and REC/Mode buttons on the front panel.

Display and Battery Compartment

Covers the LCD display and the battery compartment/cover location.

Measuring Procedure

Mode (Function) Selection

Explains how to turn on the meter and select one of the four measurement modes.

Unit Selection

Guides on how to select the display units for Temperature and Dew Point.

Humidity Measurement

Instructions for humidity measurement, specifying modes like Humidity/Temp. and Barometer/Humidity.

Barometer Measurement

Instructions for barometer measurement, specifying modes like Barometer/Temp. and Barometer/Humidity.

Dew Point Measurement

Instructions for dew point measurement, specifying the Humidity/Dew point mode.

Data Hold Function

How to freeze the measured value on the LCD display and release the hold function.

Data Record (Max., Min. Reading)

Explains how to record, view, and clear maximum and minimum readings.

Auto Power Off Management

Details the auto power shut-off function to prolong battery life and how to deactivate it.

Battery Replacement

Optional Carrying Case

Overview

1. Function Description
2. Usage Features
3. Turning On/Off and Mode Selection
4. Unit Selection
5. Data Hold Function
6. Data Record Function (Max./Min. Readings)
7. Auto Power Off Management
8. Maintenance Features
9. Battery Replacement
10. General Care
11. Optional Accessory

This document outlines the features, operation, and maintenance of a professional three-in-one meter designed for measuring humidity, temperature, and barometric pressure. The device, model PHB-318, is equipped with a microprocessor circuit that ensures high accuracy and provides a range of special functions and features, making it a versatile tool for various applications requiring precise environmental measurements. Its durable, long-lasting components are enclosed in a strong, compact ABS-plastic housing, ensuring reliability and longevity even with regular use.

Function Description

The PHB-318 meter is a comprehensive environmental measurement device capable of simultaneously displaying two different parameters, offering flexibility in how data is presented. Users can select from four distinct display modes to suit their specific measurement needs:

• Humidity/Temperature: This mode displays the current relative humidity and ambient temperature.
• Humidity/Dew Point: In this mode, the device shows the relative humidity and calculates the dew point temperature based on the measured humidity and temperature values. The dew point calculation is performed automatically by the meter.
• Barometer/Temperature: This mode presents the barometric pressure alongside the ambient temperature.
• Barometer/Humidity: This mode displays the barometric pressure and relative humidity.

The meter supports various units for each measurement type, enhancing its adaptability to different regional and professional standards. Temperature can be displayed in both Celsius (°C) and Fahrenheit (°F). Barometric pressure measurements are available in hectopascals (hPa), millimeters of mercury (mmHg), and inches of mercury (inHg). Humidity is measured in percentage relative humidity (%RH), and dew point is displayed in °C or °F.

A key feature of the PHB-318 is its fast response time for humidity measurements, allowing for quick and efficient data acquisition. The device also boasts high accuracy in atmosphere measurements, crucial for applications where precise barometric data is required.

Usage Features

Operating the PHB-318 is designed to be straightforward, with a user-friendly interface and intuitive button controls.

Turning On/Off and Mode Selection:

To power on the meter, simply press the "Power Button" (3-3, Fig. 1) momentarily. Pressing it again will turn the meter off. The device allows users to select one of the four measurement modes (Humidity/Temp., Humidity/Dew point, Barometer/Temp., Barometer/Humidity). To change the mode, press and hold the "Mode Button" (3-5, Fig. 1) for at least 2 seconds. Both the upper and lower display values will flash, indicating that the meter is in mode selection mode. Use the "Power Button" (3-3, Fig. 1) or "Mode Button" (3-5, Fig. 1) to cycle through the available modes. Once the desired mode is displayed, press the "Hold Button" (3-4, Fig. 1) to confirm the selection. The selected mode is memorized, so if the meter is powered off and on again, it will revert to the last chosen mode.

Unit Selection:

Similar to mode selection, the units for the displayed parameters can be customized. After turning on the meter, press and hold the "Unit Button" (3-4, Fig. 1) for at least 2 seconds. Both the upper and lower units on the display will flash. Use the "Power Button" (3-3, Fig. 1) to select the unit for the upper display and the "Mode Button" (3-5, Fig. 1) to select the unit for the lower display. Once the desired units are set, press the "Hold Button" (3-4, Fig. 1) to save the selection. Like the mode, the selected units are memorized for future use.

Data Hold Function:

During measurement, users can freeze the current display reading by momentarily pressing the "Hold Button" (3-4, Fig. 1). The LCD will show a "HOLD" symbol to indicate that the data is frozen. Pressing the "Hold Button" again will release the data hold function, and the display will revert to live readings.

Data Record Function (Max./Min. Readings):

The PHB-318 can record and recall maximum and minimum readings. To activate the Data Record function, momentarily press the "REC Button" (3-5, Fig. 1). The display will show "REC," indicating that the recording has started.

• To view the maximum recorded value, momentarily press the "REC Button" again. The display will show "REC MAX" along with the highest recorded value.
• To view the minimum recorded value, momentarily press the "REC Button" once more. The display will show "REC MIN" along with the lowest recorded value. While "REC MAX" or "REC MIN" is displayed, pressing the "Hold Button" (3-4, Fig. 1) momentarily will delete the current maximum or minimum value, respectively. The display will then show "REC" only, and the memory function will continue to operate. To exit the memory record function and return to current readings, press and hold the "REC Button" for at least 2 seconds. The "REC" symbol will disappear from the display.

Auto Power Off Management:

To conserve battery life, the instrument features an "Auto Power Shut-off" function. If no buttons are pressed for 10 minutes, the meter will automatically turn off. This feature can be deactivated by selecting the memory record function during measurement, by pressing the "REC Button" (3-5, Fig. 1).

Maintenance Features

Battery Replacement:

The PHB-318 operates on four DC 1.5V (UM4/AAA) batteries. When the low battery icon appears in the left corner of the LCD, it's time to replace the batteries. To do so, open the "Battery Cover" (3-7, Fig. 1) by rotating it clockwise. Replace the old batteries with four fresh ones, ensuring correct polarity. After replacement, secure the "Battery Cover" by rotating it counter-clockwise.

General Care:

The device is built with durable, long-lasting components and housed in a strong ABS-plastic casing. To ensure many years of use, it is recommended to handle the instrument with care and follow the operating instructions provided in the manual. Always keep the manual within easy reach for reference.

Optional Accessory:

An optional soft carrying case with a sash (Model: CA-52A, size: 210 x 80 x 50 mm) is available to protect the meter during transport and storage, further extending its lifespan.

Lutron Electronics PHB-318 Specifications