Yokogawa Low Concentration (ppm) Zirconia Oxygen Analyzer OX400 - Manual (Page 31)

<4. Piping and Wiring>
4-4
IM 11M10B01-01E
1) Primary output terminal
This is a terminal to output oxygen concentration at a 4-20 mA DC current. Use it at a load
resistance of 550Ω or less. The wire shall be shielded, and the shield shall be connected to the
ground on the receive side and open on the OX400 side.
2) Secondary output terminal
This is a terminal to output oxygen concentration in terms of voltage. Specify in advance one of
0-1, 0-5, and 0-10 V DC. Use it at a load resistance of 10 kΩ or more. The wire shall be shielded,
and the shield shall be connected to the ground on the receive side and open on the OX400
side.
3) Range marker output
Range recognition information such as the auto range is expressed as a 3-bit code. This is a
non-voltage contact output signal.
• ”1” when lines between RC1, RC2, and RC3 terminals and RCCOM are closed, and “0” when
open. Range recognition information is as shown in Table 4.2. The contact capacity is 2 A/30
VDC.
Table 4.2 Output Correspondence Table of Measurement Range and Marker
Measurement Range RC3 RC2 RC1
0-10 ppm (Note) 0 0 1
0-100 ppm (Note) 0 1 0
0-1000 ppm (Note) 0 1 1
0-1% (Note) 1 0 0
0-10% (Note) 1 0 1
0-100% 1 1 0
(MANUAL fixed range) 1 1 1
(Partial range) 0 0 0
4) Contact input terminal
This is a terminal to remotely turn on and off the internal pump using an external contact. This
is enabled only when the pump switch on the front panel of the OX400 is ON. The pump is OFF
when the contact is closed, and ON when the contact is open.
Nothing happens if the OX400 is not equipped with a pump.
5) Error contact output terminal
If an error (ERRx) occurs, the contact closes.
6) Alarm contact output terminal
If an oxygen concentration high/low limit alarm (ALM7) occurs, the contact closes.
7) Contact output terminal for flow path switching by multi-selector (option)
This terminal is added only when the option “/MS” is specified.
• Output terminal for measurement path flow switching: This is a contact output to switch valves
for sampling flow paths by panel operation of the OX400. You can select and turn on one of the
three flow paths. “1” when lines between MS1, MS2, MS3 terminals and MSCOM are closed,
and “0” when open. For details, see Section 6.5.
(Note) Range of auto range can be changed as follows.
0-20 ppm 0-30 ppm ····· 0-90 ppm
0-200 ppm 0-300 ppm ····· 0-900 ppm
0-2000 ppm 0-3000 ppm ····· 0-9000 ppm
0-2% 0-3% ····· 0-9%
0-20% 0-30% ····· 0-90%