Instruction manual

2.0 SPECIFICATIONS SM425 INSTRUCTION MANUAL
42500001 REV A 5
2.0 SPECIFICATIONS
This section describes the specifications for the following:
SM425P General-use separate-type detector (See Section 1.4.1)
ZO21R-L Probe protector (See Section 1.4.2)
SM425P (0.15 m) High-temperature separate-type detector (See Section 1.5.1)
ZO21P-H Adapter for High temperature probe (See Section 1.5.2)
SM425 Separate type converter (See Section 1.6)
ZA8F Flow setting unit (See Section 1.7.1)
SM425CAL Automatic calibration unit (See Section 1.7.2)
ZO21S Standard gas unit (See Section 1.8)
2.1 General Specifications
2.1.1 Standard Specifications
Measured Object:
Oxygen concentration in combustion process exhaust gas and mixed gases. If the process gas
contains a corrosive gas such as ammonia or chlorine, the SM425 may not be suited to your
application. In this case, contact Teledyne Monitor Labs.
Measurement System:
Zirconia system
Oxygen concentration:
0.01 to 100 vol% O
2
Output Signal:
4 to 20 mA DC (maximum load resistance 550V)
Measurement Range:
Any setting in the range of 0 to 100 vol% O
2
(in 1 vol% O
2
).
Digital Communication (HART):
250 to 550V, depending on number of field devices connected to the loop (multi-drop mode).
Note: HART is a registered trademark of the HART Communication Foundation.
Display Range:
0 to 100 vol% O
2
Warm-up Time:
Approx. 20 min.
Repeatability:
(Excluding the case where the reference air is by natural convection)
± 0.5% Maximum value of range setting (range up to 0 to 25 vol% O
2
)
± 1% Maximum value of range setting (range from 0 to 25 vol% O
2
up to 0 to 100 vol% O
2
)
Linearity:
(Excluding standard gas tolerance and excluding the case where the reference air flow is natural
convection.)
(Use oxygen of known concentration (in the measurement range) as the zero and span
calibration gas.)