PARR 6725 Semi-Micro Calorimeter

PARR 6725 Semi-Micro Calorimeter 

A Compact Bomb Calorimeter for Measuring the Calorific Value of Small Combustion Samples

The 6725 Semimicro Calorimeter is a compact and easily operated, static jacket, combustion calorimeter designed specifically for measuring the heat of combustion of small samples when only limited amounts of test material are available.

The need for semimicro operation frequently arises in marine biology and other ecological studies where sample sizes are limited, also for testing heat powders and pyrotechnic mixtures.


A 22 mL Oxygen Bomb

The 22 mL, 1109A Oxygen Bomb used in the semimicro calorimeter will handle samples ranging from 25 to 200 milligrams, liberating up to 1200 calories when burned in oxygen.

An Effective Thermal Jacket

Effective static thermal insulation is provided by using a silvered glass Dewar as the calorimeter vessel. This vacuum flask holds the 1109A bomb in 450 grams of water. It is supported within a stainless steel air can from which it is easily removed for filling or cleaning.

Full Series 6000 Instrumentation

The 6725 semimicro calorimeter utilizes the 6772 precision calorimeter thermometer/controller which provides all of the temperature measurement, automation and data handling capabilities of the larger series 6000 calorimeters described in the bulletin 6000MB (see link above).

1109 Semi-micro Oxygen Combustion Bomb

1109A Semimicro Oxygen Bomb

This is a 22 mL bomb designed for use in the 6725 semimicro calorimeter and earlier series 1425 calorimeters. It is intended for samples ranging from 25 to 200 milligrams, liberating up to 1200 calories. It is also used for heat powders that are self oxidizing and release less than 2400 calories per charge.



  • 2-3 Tests Per Hour
  • Operator Time Per Test is 6-10 Minutes
  • 0.4% Precision Class
  • Compensated, Dewar Flask
  • Manual Oxygen Fill
  • Manual Bucket Fill
  • 1109A, 22mL Manual Valve, Semi-Micro Bomb
  • USB port for Printer and Balance Communication
  • SD Memory for easy data and log transfer
  • TCP/IP via Ethernet Network Connection
  • 6725: Dimensions (in) 9w x 13d x 13h
  • 6772: Dimensions (in) 22w x 14d x 12h
  • 6725: Dimensions (cm) 22w x 33d x 33h
  • 6772: Dimensions (cm) 56w x 36d x 31h


Spare Parts

Spare parts available:
Part No. Description
1109A Oxygen Bomb, 22 mL
6009A 500 Firings Kit for 1109A
1824 Oxygen Filling Connection
208AC Inconel Fuel Capsules
45C10 10cm Fuse Wire Card
3414 Vial of 0.2 g, Benzoic Acid Pellets, 100 pcs
Conversion Parts for 6725 to 6755
All of the parts needed to convert a 6725 Semimicro Bomb Calorimeter to a 6755 Solution Calorimeter are provided in a 6759 Conversion Set, consisting of:
6759 Conversion Set
123C Dewar Flask with Locating Ring and O-ring
A120C Calorimeter Cover Assembly with Bearing Tower and Pulley
A129C Glass Push Rod
A130C Cell Assembly without 126C Cell Bottom
126C Cell Bottom PTFE
3421 TRIS, Parr Standard, 100 g Bottle
Operating Instructions for the 6755 Solution Calorimeter


Model 6725 Ordering Guide

6725 Semimicro Calorimeter
Model No. Voltage Description
6725EA 115 Semimicro Calorimeter with 1109A Oxygen Bomb 115V
6725EF 230 Semimicro Calorimeter with 1109A Oxygen Bomb 230V
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