Omega Engineering HH303 User Manual

Type K J Thermometer



Command R:
Equivalent to one pushing on the REL button and no message is
returned.


Command C:
Equivalent to one pushing on the / button and no message
is returned.


Command A:
1
nd
BYTE:
The first byte is the start byte , it value is 2.
2
nd
BYTE:
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
C/F Low Bat Hold REL K/J MAX/AVG/MIN
bit 2 bit 1 bit0
0 0 0 → normal mode
0 0 1 → MAXIMUN mode
0 1 0 → MINIMUN mode
1 0 0 → AVG mode
1 1 1 → calculate MAX/MIN/AVG in back-ground
and lcd "MAX""AVG""MIN" will flash.
bit3: 1→0→K TYPE 1→J TYPE
bit4: 1→REL
bit5: 1- HOLD 0→not HOLD
bit6: 1→LOW BATTERY 0→BATTERY NORMAL
bit7: 1→ 0→
3
nd
BYTE:
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
point minus OL point minus OL
bit0:1→main window value is OL, 0→not OL
bit1:1→main window value is minus, 0→main window value is plus.
bit2:1→4
th
byte and 5
th
byte represent #### 0→4
th
byte and 5
th
byte

Omega Engineering HH303 Specifications

General

Type	Digital Thermometer
Accuracy	±1% of reading or 1°C (1.8°F), whichever is greater
Resolution	0.1°C/°F
Power Supply	9V Battery
Dimensions	162 x 76 x 38 mm (6.4 x 3.0 x 1.5")
Sensor Type	Thermocouple
Auto Power Off	Yes
Display	LCD
Battery	9V Battery
Probe Type	K-type thermocouple

Summary

Introduction and Overview

Product Introduction

Introduces the digital thermometer for K-type and J-type thermocouples.

Product Specifications

Measurement Range and Resolution

Details the temperature measurement ranges and display resolution for K and J types.

Accuracy and Environmental Conditions

Specifies measurement accuracy, operating, and storage environmental parameters.

Physical Characteristics and Power

Covers dimensions, weight, accessories, power requirements, and battery life.

Symbol and Button Definitions

Display Symbols and Indicators

Explains the various symbols and indicators displayed on the LCD screen.

Button Layout and Functions

Identifies device buttons and describes their operational functions.

Operation Instructions

Basic Operation and Setup

Guides on powering on, connecting thermocouples, and selecting scales/types.

Advanced Measurement Functions

Details data hold, T1/T2 display control, and relative measurement modes.

Data Logging and Power Management

Explains MAX/MIN/AVG modes, auto power off, and low battery warnings.

Digital Output and Communication

RS232 Command Interface

Details the serial interface, commands, and data format for digital output.

Calibration Procedure

K,J Thermometer Calibration

Step-by-step guide for calibrating the HH302 and HH303 models.