M21-M31-M41-M61 Pressure gauges with electrical contacts M21/M31 - Differential pressure M41 - Relative pressure with strong overpressure M61 - Pression Absolue Gauges with bellows Ø 150 mm For corrosive fluids and atmospheres Low pressure Dry contacts (CES) M31 Hight pressure Electrical part conforms to Low Voltage Directive DBT 73/23/CE Based upon the MZ (M21) - MX (M31) - ME (M41) - MA (M61) gauges of which they share all characteristics, they are fitted with electrical contact blocks allowing the following control functions: - single : min and max - dual : min-max and max-min M21 Specifications (20°C) Measurement range See table on next page Accuracy ±3% Block diagragm showing the contact block control functions: Gauge working -20...70°C temperatureThe gauge may be used on fl uid temperatures up to 200°C providing that the gauge temperature does not exceed 70°C. Protection rating IP 65 according NF EN 60529. Sensing elementTwo 1.4404 (AISI 316L) stainless steel bellows. Balance effect by high tensile leaf spring; mechanical start and end-of-travel stops to withstand full static pressure. Connections and parts in contact with process fluid 1.4301 (AISI 304) Stainless steel. Thread: G 1/2 or 1/2 NPT. Case and bezel ring 1.4301 (AISI 304) Stainless steel. bayonet lock type. WindowTransparent polycarbonate domed with watertight index adjustment knob. Window gasket Elastomer. Movement Stainless steel. MINI MAXI INTER-INDEX MAXI-MINI MINI-MAXI Characteristics of electrical contacts and relays AREB: see data sheet A21.33 Options Contacts material : palladium silver, gilded contacts Oxygen application Code 0765 Special threads ≤ G 1/2 or 1/2 NPT. Restrictor screw Code 0771 Index regulation by a protected system Code 0758 DialAluminium alloy, rubber zero stop, black graduations and figures on white background.. Pointer Aluminium alloy, black painted. Electrical connection Terminal block. M20x1.5 cable gland Ø 7 a 13 mm cable. www.baumer.com/process Design and specifications subject to change without notice Data sheet A24.03 Page 1 Dimensions (mm) - Type of mounting Presse étoupe M20x1,5 TYPE A TYPE C TYPE D M31 Cable gland M20x1,5 TYPE B TYPE E TYPE F Panel cut out panel cut out TYPETYPE B or CB or C 88 M21 54 TYPE CAD Type CAD TYPE BEF Type BEF . TYPE D Measurement ranges (bar) M61(MDA/CEI) (MA/CES) M61 M41 (ME/CES) Overpressure Surpression Overpressure Surpression Code Code Absolute pressure Pression absolue Code A C D E F G H J K L M N Choose an absolute pressure range, corresponding to the maximum overpressure to which the gauge will be submitted. For an intermediate overpressure, take the value of the overpressure immediately above. Relative pressure Pression relative Code A C D E F G H J K L M N Choose a relative pressure range, corresponding to the maximum overpressure to which the gauge will be submitted. For an intermediate overpressure, take the value of the overpressure immediately above. M21 (MZ/CES) - M31 (MX/CES) Static pressure Pression statique Differential pressure Accuracy for all these pressure gauges : Accuracy ± 3 % on 270° ( Accuracy > 3 % on 270° Accuracy > 3 % on 170° A C D E F G H J K L M N Accuracy > 3 % on 100° Values for readings in undisturbed areas Choose a differential pressure range ∆P, corresponding to the maximum static pressure to which the gauge will be submitted. For an intermediate static pressure, take the value of the static pressure immediately above. www.baumer.com/process Design and specifications subject to change without notice Data sheet A24.03 Page 2 Ordering details - M21/M31/M41/M61 Family Pressure gauges 1 Digit Type M21 M31 M41 M61 2´ Digit Type of contacts CES 3´ Digit Control functions Mini (4002) Maxi (4001) Inter-index open (4021) Mini-maxi (4021) Maxi-mini (4012) Inter-index closed (4012) 4´ Digit Mxxxxxxxxx M 2 3 4 6 1 Type of mounting and connection position* 5´ Digit bottom connection, back flange back connection, front flange (except M21) bottom connection, front flange bottom connection back connection, back flange (except M21) back connection (except M21) * Option Stainless steel case and bezel ring 1.4404 (316L) change A with 1, B with 2, C with 3, D with 4, E with 5 and F with 6 Hydraulic connection G 1/4 G1/2 1/4 NPT 1/2 NPT 6´ Digit Unit of measurement bar kPa 7´ Digit Measurement ranges 8´...9´ Digit See measurement ranges codified on tables (previous page) 1 2 3 4 7 8 A B C D E F 2 3 5 6 B D Static pressure or overpressure See static or overpressure scale on tables (previous page) xx 10´ Digit www.baumer.com/process Design and specifications subject to change without notice x Data sheet A24.03 Page 3 UK/09-2007 This data sheet may only be reproduced in full www.baumer.com/process Design and specifications subject to change without notice Data sheet A24.03 Page 4