SECTION 1 INTRODUCTION

The OMEGA® RH31 Handheld Temperature/Humidity Indicator has broad applications in air conditioning services, food management, process engineering, and many uses in experimental and research facilities.

The built-in digital display is accurate to ±0.6˚ F (0.3˚ C) and ±3% RH, and reads out in either degrees F/C.

Three probe types are available for use with the RH31 and all are interchangeable through a connector located on the RH31 Indicator:

RH31-1 General Purpose Probe for Laboratory and Warehouses RH31-2 Thin Type Probe for Tanks and Narrow Gaps RH31-3 Remote Mounted Probe with Cable

The ultra sensitive composite sensor element in the probes is composed of a temperature and humidity sensor formed into a single unit. The humidity sensor is an electrostatic capacitance type polymer-film, and the temperature sensor is a platinum resistance RTD.

A calibration kit (part number RH30-CAL) is also available for recalibrating the RH31 Indicator and RH31-1 General Purpose Probe.

Obtain new sensor, if temperature/humidity sensor has become defective. No adjustment is necessary after exchange, because the sensor is interchangeable.

If the response time is delayed in the general type sensor, remove the cap from the sensor tip, and remove the filter. (Screw in the cap as before after removing the filter.) In this case, the sensor is apt to be contaminated with dust or the like, and its service life may shorten.

The battery assembled at the delivery time from the factory is used for test so that its life may be shorter than the nominal value.

Power auto-off function

A power auto-off function is provided and the battery life is longer than 400 hours in continuous use at normal temperature.

The RH31-RS232 has a memory function and is also able to collect up to 1500 points of data (temp., humidity). The measuring interval is 10 minutes.

Temperature-humidity sensor exchange

The temperature-humidity sensor is interchangeable, and it can easily be replaced, if it has been broken or it has deteriorated.

Handling of temperature-humidity sensor

Handle this precise unit carefully so as not to drop or strike it, otherwise a trouble may occur. This unit is not water-proof. Don’t dip it into water or moisten it.

SECTION 6 SPECIFICATIONS

RH31 METER

Measuring range: Temperature: -10 to 60˚ C Relative humidity: 0 to 100% RH

Accuracy rating: Temperature: ±(0.1% of measured value +0.2˚ C) Relative humidity: ±(0.1% of measured value +0.2% RH) Dew-point temperature: ±1.0˚ C

Wet-bulb temperature: ±0.8˚ C

(at temperature 25˚ C and relative humidity 50% RH)

Temperature Temperature: ±(0.2% of measured value +0.1˚ C)

coefficient (per 10˚ C): Relative humidity: ±(0.2% of measured value +0.1% RH)

Display:

31/2 digits LCD (Liquid crystal) digital display

 

Temperature, relative humidity, dew-point temperature,

 

wet-bulb temperature, unit, battery shortage mark

Resolution:

Temperature: 0.1˚ C/0.1˚ F

 

Relative humidity: 0.1% RH

Memory function:

Data: 1500 data each of temperature and humidity

 

Content: Temperature, humidity

 

Measurement Time Interval: 10-minute

Communications

RS-232C

Interface:

(with communication cable)

Working

0 to 50˚ C (32 to 122˚ F)

temperature range:

Working

0 to 85% RH (no dew condensation is allowed)

humidity range:

Power Voltage:

Exclusive lithium battery 1 piece (7.2 Vdc)

Battery life:

Approx. 400 hours

 

(at normal temperature and humidity)

Weight:

Approx. 180 g (6.3 oz) (without memory function)

 

Approx. 190 g (6.7 oz) (with memory function)

RH31 SENSORS

Temperature: -10 to 60 ˚ C (14 to 140˚ F)

Measuring range:

 

Relative humidity: 0 to 100% RH

Accuracy rating:

Temperature: ±0.15˚ C (at 0˚ C), ±(0.15+0.002[t])˚ C,

 

t: Measured temperature (˚ C)

 

Relative humidity: ±3% RH (at 25˚ C, 0 to 90% RH)

Temperature

Relative humidity: ±1% RH (Reference 25˚ C, per 10˚ C)

coefficient:

Response:

Without filter: Approx. 1 minute (90% response)

 

With filter: Approx. 3 minutes (90% response)

Sensor element:

Temperature: Platinum resistance thermometer (JIS Class A)

 

Humidity: Capacitance type high polymer film

Cable length:

Standard 1m (3'), Maximum 5m (16')

Weight (with 1m

RH31-1: Approx. 60 g (2.1 oz)

of cable):

RH31-2: Approx. 70 g (2.5 oz)

 

RH31-3: Approx. 100 g (3.5 oz)

1

14

Page 3 Page 5
Page 4
Image 4
Omega M3185/1098 manual Introduction, Specifications, RH31 Meter, RH31 Sensors
Page 3 Page 5

M3185/1098 specifications

The Omega M3185/1098 is a sophisticated and highly regarded timepiece that showcases the perfect blend of traditional Swiss watchmaking craftsmanship and modern technology. Designed to cater to both watch enthusiasts and professionals, the M3185/1098 is revered for its precision, reliability, and aesthetic appeal.

At the heart of the Omega M3185/1098 is the exceptional Caliber 3185 movement. This Swiss automatic movement is renowned for its accuracy, boasting a remarkable chronometer certification from the Swiss Official Chronometer Testing Institute (COSC). With a power reserve of approximately 48 hours, the Caliber 3185 ensures that the watch remains functional and precise even after being worn for an extended period. Additionally, this movement features a date function that is easily adjustable, adding to the watch's practicality.

Incorporating advanced technologies, the Omega M3185/1098 features the innovative Co-Axial escapement. This revolutionary component reduces friction between the moving parts of the watch, which ultimately results in improved accuracy and longevity. The Co-Axial escapement minimizes the need for regular servicing, making it a favorite among adventurers and everyday users who appreciate low-maintenance yet reliable timepieces.

The design of the Omega M3185/1098 reflects a harmonious balance between elegance and sportiness. It typically features a stainless steel case that is both durable and lightweight, ensuring comfort during wear. The watch face is often adorned with luminous hour markers and hands, enhancing visibility in low-light conditions. This is complemented by a scratch-resistant sapphire crystal that protects the dial from potential damage.

Water resistance is a key feature of the M3185/1098, making it suitable for various activities, from swimming to snorkeling. With a water resistance rating of up to 300 meters, wearers can confidently engage in aquatic adventures without fearing damage to the movement.

In summary, the Omega M3185/1098 stands out as a remarkable timepiece, showcasing an impeccable blend of state-of-the-art technology and timeless design principles. The combination of the Co-Axial escapement, Caliber 3185 movement, and robust construction make it an ideal choice for anyone seeking a watch that exemplifies both style and functionality. Whether worn in a professional setting or during leisure activities, the M3185/1098 remains a testament to Omega's commitment to excellence in horology.
Top Page Image Contents