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Parallel Tube Liquid Temperature Bath.

Neptune 915H Parallel Tube Liquid Bath. Temperature range 5°C above ambient to 300°C.
Neptune 915MWE Parallel Tube Liquid Bath. Temperature range -30°C to 300°C.
Neptune 915LW Parallel Tube Liquid Bath. Temperature range -65°C to 300°C.

The 915 Parallel Tube Liquid Bath is, no question, the finest stirred liquid parallel tube bath produced.
Typical uncertainties of measurement are less than ±0.0005°C over the complete temperature
range of -65°C to +300°C.

Parallel Tube Liquid Bath.

Model  Description 
915H   Parallel Tube Liquid Bath. Temperature 5°C above ambient to 300°C
915MWE  Parallel Tube Liquid Bath. Temperature range -30°C to 300°C.
915LW   Parallel Tube Liquid Bath. Temperature range -65°C to 300°C
Fixed Points:
The Model 915 Parallel Tube Liquid Bath is a development of the previous 815 model and has many
features which enhance its performance and enable ease of operation.
It is suitable for the calibration of Liquid in Glass thermometers, Industrial Platinum Resistance
thermometers, Standard Platinum Resistance Thermometers, Thermocouples and Industrial Temperature
sensors. It can also be used with fixed point cells.
The temperature range of the standard 915 liquid calibration bath (915H) is 40°C to 300°C.
When the 915 is used in conjunction with our external chiller the low temperature limit can be
extended to -65°C.

Liquids are circulated by a propeller which mixes and forces the liquid through a specially designed orifice
in the rear of the two parallel tubes.
A variable speed motor optimizes the flow as the viscosity of the liquid changes.
Below the orifice plate liquid is circulated over a mineral insulated heater and temperature sensors which
control the temperature of the bath. The liquid flows up the calibration tube and weirs over the tube into a
collection tray where it returns to the rear tube for recirculation. An angled side entry tube enables a
refrigeration cooling probe to be inserted in the rear of the two parallel tubes.

The temperature controller has resolution from 0.01°Cto 0.1°C which auto scales to suit the four digit
display (all digits can be read with the Cal NotePad Software). The 915 is fitted with serial
communications for interfacing to a PC as standard.
With the high cost of some silicon oils the 915’s seven liter capacity makes it relatively inexpensive to
fill compared to many other baths. The changing of liquid is easily enabled by using the fitted drain.

The design also allows for the expansion of liquids when being raised to a particular calibration
temperature.
Parallel Tube Liquid Bath.
MODEL 915 H
915 MWE
915 LW

Standard Unit,
supplied with chiller 915-10
supplied with chiller 915-11 
Temperature Range  915 H
915 MWE
915 LW 
5°C above ambient to 300°C
-30°C to 300°C
-65°C to 300°C 
Accuracy  Using Fixed Point Cells ±0.0005°C
Mercury Triple Point, Water Triple Point,
Gallium Melt Point, Indium Freeze Point,
Tin Freeze Point 
Vertical Profile  At extreme temperatures ±0.003°C
At close to ambient ±0.001°C 
Temperature Stability
by Comparison 
Direct in Liquid ±0.001°C
In Equalizing Block ±0.0005°C 
Liquid Capacity  Approximately 7 liters 
Communications  Included as standard 
Supply  1kW (excluding Chiller) 108-130 or 208-240V, 50/60Hz 
Dimensions  1020mm x 580mm x 640mm (HxWxD) 
Weight  45kg approximately