Metek 920, Operator'S Manual With Essential Health And Safety Requirements

Page: 31 / 278

Specifications | 2-3
Temperature Drift
SO
2
(40 PPM/Cell length)/°C
NO & NO
2
(120 PPM/Cell length)/°C
NO
x
(80 PPM/Cell length)/°C
H
2
S @ 228 nm (80 PPM/Cell length)/°C
H
2
S @ 214 nm (30 PPM/Cell length)/°C
NH
3
(40 PPM/Cell length)/°C
Use above specifications OR 3* (Customer full-scale/Maximum full-
scale), whichever is greater.
24-Hour Zero Drift
SO
2
: 1.0 % of full-scale of standard ranges
NO and NO
2
: 2.0 % of full-scale of standard ranges
NO
x
, NH
3
, H
2
S: 1.5 % of full-scale of standard ranges
Use above specifications OR the equivalent of 10 °C Temperature
Drift (whichever is the lesser; with Auto-Zero disabled).
Customer Connections
Analog Outputs
4 isolated 4–20 mA self-powered (or optional loop-powered; loop power
by end user).
Digital Communication
One RS-232 port used for service diagnostics.
One RS-422 port for remote communication with a Data Acquisition
System (DAS), using Modicon Modbus
®
protocol.
Optional RS-485 for Modicon Modbus
®
protocol (requires RS-232 to
RS-485 converter).
Optional System 200 Configurator Software.

NOTE

NOTE