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Moisture / Dew Point Hygrometer-GP400

Intrinsically Safe Oxygen Analyser

( Dwyer )

General

The EC91 Process Oxygen Transmitter will detect levels of oxygen as low as 1ppm, up to high percent levels and can be used on most industrial gases and atmospheres. There is no need for routine maintenance of the fuel cell

and the instrument can be easily calibrated, using ambient air or standard calibration samples. The enclosure is manufactured from moulded glass fibre reinforced polyester, a material with high impact resistance. It will not be harmed by oils, common acids and alkalis, making it suitable for harsh environments. It is protected to IP65.

The EC91 transmits a 4-20mA signal which corresponds to the range of the analyser. Up to six ranges can be specified. A safe area digital indicator and alarm is available as an option. Custom designed sample systems are available on request. Sample gas may be piped directly to the instrument or remote cell assembly (also certified

intrinsically safe). Sample pumps and aspirators are also available. All the electronic circuits are intrinsically safe and have been certified to ATEX. The EC91 is approved for EEx ia IIC T4.

Features

Maintenance-free sampling

Air calibration facility

3-year warranty

Certified for Zone 0

Applications

Inert atmosphere gas blanketing

Gas purity

Glove boxes

Metallurgy

Oxygen deficiency monitoring

Gas line monitoring


Technical Specification

Ranges

6 selectable

0-20, 0-200, 0-2000 (ppm) 0-2%, 0-20%, 0-30%

Other ranges available on request

Resolution

0.05% of scale

Accuracy

>10ppm ±2% of reading at 20°C

±5% of reading over temperature range

<10ppm ±2% of reading + 0.4ppm at 20°C

±5% of reading + 0.4ppm + 0.15ppm/°C over

temperature range

Response time

90% of reading within 20 seconds

Calibration range

Ambient (20.9%) or certified gas

Measuring cell type

Electrochemical fuel cell

Operating Conditions

Sample inlet pressure

0.1 to 1 Barg, up to 17 Barg with optional sample system

Sample flow rate

30 ml/min to 5 ltr/min

Sample temperature

0 to 40°C

Ambient temperature

0 to 40°C, RH 0-99% non-condensing

Sample connections

1/8" OD compression fitting

Unsuitable gases

Corrosives, acid gases and solvents

Power Requirements

Power supply

24Vdc via approved Zener barrier mounted in the safe area

Power consumption

10W

Display type

Digital LCD

Analogue outputs

Current: 4-20mA (0-20mA) isolated

Maximum loop resistance 400 Ohms

Cabinetry And Mounting

Enclosure

Reinforced polyester

Installation

Wall mounted

Dimensions

200W ~ 200H ~ 175D (mm)

Weight

3kg

Ingress protection

IP65

Certification

ATEX

Certificate number Baseefa 04 ATEX0240

Approved for EEx ia IIC T4.

Options

Local display

Analogue in place of standard digital display

Sample pump

For pressure below 0.1 Barg

Remote probes

1" NPT or BSP