M1000Oxygen Monitor

M1100 SeriesOxygen Monitor

Specialist in preventing dust explosions

The Monox1000 SX.IS Monitor is designed as an in situ oxygen monitor sensor/transmitter for inert applications in silo’s, trans-port systems, tanks and bins of for example chemical powders, which have a potential risk for a dust explosion.

The atmosphere in the silo or bin is inertised with N2 (or CO2) with the result that due to the low oxygen concentration no ex-plosions can occur. To ensure that the oxygen gas concentration is maintained within the specified limits it is necessary to monitor and control the nitrogen (N2)-dosing process.

Since the environment is mostly very dusty it is not very advisable to use a sampling system with a pump.

The dust will frequently block the tubing and filters of the sam-pling system, causing a high level of maintenance. Due to the patented operating principle of the Monox1000, the chemical powder does not block the sensor. This results in a very reliable system and a long term maintenance free operation.

Field of application

SILO’S, BINS, transport systems or other inertised SYSTEMS with chemical powders, sugar dust, flour that use nitrogen (to prevent a dust explosion).

Optional• Automatic Calibration System (product sheet on request)• UPS, Uninterruptable Power Supply (product sheet on request)

Advantages• No sampling system required • No maintenance• Economic advantage: reduces spillage of nitrogen• No pumps or filters• No moving parts• Significant savings in N2 consumption (at inert systems)• Increases safety

Successfully installed by

• Momentive Speciality Chemicals• Shell Chemical Pernis• Sabic The Netherlands• Sabic Spain• Sabic China• Sabic V.S.• Cerexagri B.V. / Uniphos• EMDE Industrie-Technik GmbH

Method of use / Safety recommendations

See manual M1000 & www.steuma.com

Certificates

ATEX: Ex II 2 GD EEx d IIC T4 (Tmax 125°C)UL classI, div.1, groups A,B,C en DUL classII, div.1, groups E,F en G

Technical Data

The Monox1000 is designed as a 4..20 mA transmitter type instrument with digital dis-play for the measured oxygen concentration. This concentration is the input for a system to control the inertisation.

The oxygen sensor is built in a pressure proof and stainless steel housing. The transmitter housing is made out of aluminium, and is splash waterproof and HF-shielded. The monitor is mounted on a flange which is located at the top of the silo or bin.

The Monox1000 SX.IS is intrinsically safe according to Ex II 2 GD EEx d IIC T4 (Tmax 125°C)IP6X with certificate number ISSeP 03ATEX140.

Technical Specifications

Measuring range 0 .. 25% O2

Display 3 ½ digit LCD

Accuracy +/- 2%

Repeatability +/- 2% of measuring value

Zero drift 0,5 % / month

Measuring principal electrochemical

Response time (T90) < 10 s sensor life ca. 2 year

Temperature range -15 .. +40 grC

Humidity range 15 .. 99 % R.H., non condensing

Process pressure +/- 100 mbar compared to atmosphere

Interfering gasses strongly oxidising gasses, H2 (<-2%), CO (<-0.5%)

Electrical power 24 VDC

Output signal 2-wire, 4 .. 20 mA, linear

Dimensions 180x206x80mm

Weight 2,5 kg

Process flange standard SS316, 2” ANSI B 16,5 Class 150 Flange

Calibration gas fitting 1/8”NPT

M1000 Series | Oxygen Monitor