TRX-700
Thermal Flowmeter Converter
Digital Output Compatible

TRX-700● Outline
TRX-700 is an intelligent type converter for thermal
flowmeters. High-precision and high-performancecapacities have been achieved by the new design of asignal processing circuit mounting double CPU’s.
All the operation factors are handled by the operatingkeys arranged on the front panel that enables to makesettings and alterations in a user-friendly way.
Functions necessary for process monitoring andcontrolling such as flow rate, totalization and alarm
output are all installed as the standard specification.
In addition, data processing with a host computer has
made available through serial communication with
RS-485 interface.

● Features○ Digital output function
Output of serial data through RS-485 interface suchas flow rate, totalization and self-diagnosis enables
to make data processing by a host computer.

○ High precision
The flow rate of various types of gas can bemeasured with a high accuracy within ±1.0% F.S.
by the measurement principle of our originality.
The measurement principle thus established ontheoretical analysis enables to apply it to almost all
general types of gas.

○ Improved compatibility
The converter absorbs the characteristic of thedetector of the thermal flowmeter that improvescompatibility of the detector and the converter.

○ Wide range ability
The measurement accuracy is maintained sufficientfor practical purpose even in a flow rate range as
low as 0.5m/s. The drawback of traditional orificetype and vortex type gas flowmeters has thus beenbroken through.

○ High durability
The design giving considerations to minimize
power loss as well as heat generation inside theconverter ensures long life of the converter.

○ User-friendliness
Setting of all operating conditions such as full scale
flow rate, flow rate unit, pulse rate, alarm output,
analog output and serial output can easily bechanged by operating keys on the front panel andserial communication function.

TOKYO KEISO CO., LTD.

○ Applicable to any type of gas
With the measurement principle by the establishedtheoretical analysis system, the converter isapplicable to measurement of any type of gas.
Since the setting for different gas substancecharacteristics can be set by a host computer, thecase of gas changes can be thoroughly coped with.

○ Minimal influence under temperature change
The influence of gas temperature change is almost
negligible. When temperature changes widely, mass
flow rate measurement not influenced bytemperature fluctuation can be applied by inputting
a temperature sensor signal.

○ Light weight
Compared with the last model (TR-7000), TRX-700
weighs less by about 33%.

● Application○ Semi-conductor manufacturing gas line

○ Medical oxygen supply line system○ Air-conditioning facilities○ General industrial process and utility line
○ High temperature dry air line
○ Combustion gas line
○ Low pressure gas line
○ Waste disposal incinerating facility line
○ Power plant line
○ Automobile relevant measurement line
○ Flow rate measurement line for other types of gas

TG-ES835-0EOCT., 2003

TRX-700

Thermal Flowmeter Converter● Specification
Connectabledetector

TH-1100(SP, HSP) / 1100HQ / 1200 / 1400
/ 1500 / 1500HQ / 1600 / 1700 / 1800

Installation

Mounted on panel (DIN96×96)

Construction

Indoor specification (IP20 equivalent)

Accuracy±1%F.S. ± 1digit (Flow rate)±1.05%F.S. ± 1digit (Totalization)

Analog output

4 ~ 20mADC / Allowable load resistance 500Ω

Pulse output

Open collector output / 35VDC/50mA (max.)

Contact output ofalarm

SPDT relay contact (High alarm / Low alarm)
125VAC/0.4A (20VDC/2A)● Model code
Model code

Temperature andpressure correction

1200 / 2400 / 4800 / 9600bps (Selectable)

Cable length

ID address: 00 ~ 99
Output: Flow rate, totalization, bar graph, temp.,
pressure, heating current, firmware version,
serial No., error message, etc.

Select one item from flow rate, totalization, temp.,
Pressure, heating voltage, internal temp. andSPS ripple, or error message.

Lower section

Select one item from bar graph, flow rate,
Totalization, temp., pressure and heating current,
Or error message.

Maximum numberof display digits

5 digits (0.000 ~ 99999) (Flow rate)
7 digits (0.00 ~ 9999999) (Totalization)

Temp. correction
function

3-wire type resistance temp. sensor (Pt100Ω)
is required separately.

Pressure correction
function

Pressure gauge with 4 ~ 20mADC analog output
Is required separately.
(Used mainly for indication of actual flow rate.)

Response time

3 seconds (63% step response)

Dimensions

96H × 96W × 243D (mm)WeightAbout 1.95kg

Cable length

100m (max.)

Power supply

90 ~ 264VAC 50/60HzPower consumption

60W (max.)

Elect. connection

Pin terminal connector

Ambient temp.

0 ~ 50ºC

Ambient humidity

10 ~ 90% RH (No dew condensation)

4
15m

210m

315m

420m

525m

630m

735m

840m

945m

A 50m

Dot matrix LCD, 16 characters × 2 lines
With backlight

Upper section

1F 50m longer up to max.100m ** Please specify required cable length.

● Dimensions
9692

THERMAL FLOW CONVERTOR

92

Indication

Display

Protocol: 8N1

No correction
Temperature correction
Temp. + Press. correction

096

Digital output(RS-485)

Contents

T R X - 7

TOKYO KEISO CO., LTD.

Front view
10Rear view
215

18

Side view

TG-ES835-0E