
Thank you for purchasing the Spirax Sarco MTI10 insertion or MTL10
inline Thermal Mass Gas Flowmeter and Temperature Transmitter.
The Model MTI10/MTL10 is one of the most technically advanced
flowmeters in the world. The MTI10/MTL10 utilize the same sensor and
electronics. The MTL10 includes a company supplied flow tube, while
the MTI10 is inserted into an existing pipe. Extensive engineering effort
has been invested to deliver advanced features, accuracy measurement
performance and outstanding reliability.
This Instruction Manual contains the electrical and mechanical
installation instructions as well as details for programming, maintaining
and troubleshooting the meter.
This manual is divided into the following sections: Introduction,
Installation, Wiring, Operation, Calibration Validation, Modbus,
Maintenance, Troubleshooting, and Appendices.
Theory of Operation
The MTI10/MTL10 is an innovative Thermal Mass Gas Flowmeter
and Temperature Transmitter. It is microprocessor-based and field
programmable. The MTI10/MTL10 thermal sensor operates on the
law that gases absorb heat. A heated sensor placed in an air or gas
stream transfers heat in proportion to the stream’s mass velocity. There
are two sensor elements connected to a balanced bridge circuit. One
sensor element detects the gas temperature and a second element is
maintained at a constant temperature above the gas temperature. The
energy applied to the heated sensor to maintain a constant temperature
differential (constant ∆ T) is directly proportional to the mass flow
velocity. The MTI10/MTL10 flowmeter maintains accurate flow
measurement over a large temperature and pressure range.
Mass Flow
The Model MTI10/MTL10 measures mass flow; an advantage over
other flowmeters which measure volumetric flow rate. Volumetric flow
is incomplete because temperature and pressure are unknown and
must be measured separately. For example, the mass flow of a gas
depends on its temperature and pressure. As temperature and pressure
changes, the gas volume changes but not its mass. Therefore a device
measuring mass flow is independent of temperature and pressure. The
Model MTI10/MTL10 provides a direct measurement of gas flow in Mass
units (kg/hr, lb/hr), standard units (SCFM, SLPM) or normal units (NM3/
hr, NLPM) with no additional temperature or pressure measurements
required.
4
Introduction
Calibration
Validation
I/O Description
Product
Description
Mass Flow
Welcome
Flow Calibration