The indicating pointer traverses a 270° arc, providing excellent readability. It is driven by a precision-jeweled rotary movement that multiplies rotation of the torque tube through a gear and pinion to the pointer. The movement employs a thermally stable Ni-Span-C hair spring. Zero/Range adjustments can be made without removing the scale-plate or pointer. Linearity adjustments are readily accessible after removal of the scale-plate.

CASES

The standard case for indicators and switches is die-cast aluminum with a special epoxy black finish. Models 226C, 227C, and IT / ITS feature a NEMA-4 / IP65 rated case. The Model 232C has a 304 stainless steel case. The Models 290D, 322C, 752, 753, and select models of the IT / ITS Series have explosion-proof cases.

MODEL TYPES

Model 226C (w/224C DPU)

A 3-inch (76 mm) indicator is a lightweight and compact instrument for use where panel space is at a premium.

Model 227C (w/224C DPU)

A 6-inch (152 mm) indicator that is ideally suited for tank level, flow, and pressure drop across filters. This model is also available in stainless steel (M227CS).

Model 232C (w/224C DPU)

An economical 6-inch (152 mm) DP indicator that is designed for use in applications where high accuracies are not required. Suitable for tank level, flowrate, and DP across filters applications. It features a 500 psi (34.5 bar) SWP Maximum and a 0-50" w.c. to 0-100 PSID (0-124 mbar to 6.9 bar) DP Range. The case and bezel are 304 SST. The housings are forged brass (steel and SST optional) with 1/4" x 1/4" NPT connections. The bellows are BeCu or 316 SST, with an Ethylene Glycol and Water Fill. The indicating accuracy is ±2.00 % of full scale. The unit can be pipe, wall, or panel mounted.

The indicating pointer traverses a 270° arc, providing excellent readability. It is driven by a precision-jeweled rotary movement that multiplies rotation of the torque tube through a gear and pinion to the pointer. The movement employs a thermally stable Ni-Span-C hair spring. Zero/Range adjustments can be made without removing the scale-plate or pointer. Linearity adjustments are readily accessible after removal of the scale-plate.

SWITCH CONTACTS

Switch models can be ordered with 1 to 4 adjustable snap-acting type SPDT switches (DPDT and hermetically-sealed switches available as specials on selected models). Switches can be set for high, low, or both high and low on units with two or more contacts. Contacts are adjustable from 5 to 95% of full scale and are set with a control screw located flush with the scale-plate. Contacts can be set to open or close with increasing or decreasing DP — providing maximum flexibility.

Relays

Some models can be ordered with 1 or 2 DPDT relays (mounted inside the case) for greater switching action and increased current handling capacity without the need for external mounting or wiring.

ACTUATING UNITS

The indicator is actuated by a rupture-proof bellows differential pressure unit (DPU) with integral temperature compensation. The M199 DPU features dual, liquidfilled, bellows designed to withstand repeated overranges equal to the safe working pressure of the housings without a change in calibration.

INDICATING MECHANISM

The indicating pointer traverses a 270° arc, providing excellent readability. It is driven by a precision jeweled rotary movement that multiplies rotation of the torque tube through a gear and pinion to the pointer. The movement employs a thermally stable Ni-Span-C hair spring.

The movement has a micrometer screw for convenient range adjustments. Zero/range adjustments can be made without removing the scale plate or pointer. Linearity adjustments are readily accessible after removal of the scale plate.

SWITCH CONTACTS

BARTON switches are available in configurations with 1 to 4 adjustable snap-action type SPDT switches, with DPDT and hermetically-sealed switches available as specials on selected models. Switches can be set for high or low, or both high and low on units with two or more contacts.

Chosen for their reliability under severe shock and vibration conditions, the contacts are adjustable from 5 to 95% of full scale range, and are set with a control screw located flush with the scale-plate. Contacts can be set to open or close (by reversing wires at terminal) with increasing or decreasing differential pressure – providing maximum flexibility.

Relays

Some models can be ordered with one or two relays mounted inside the case. The addition of a relay allows greater flexibility of switching action and increased current handling capacity without the need for external mounting or wiring – important in applications that require explosion-proof housings.

CASES

BARTON switches are available in indicating and blind case versions. The standard case is die-cast aluminum with a special baked epoxy black finish, which is NEMA-4/IP65 rated. Optional “S” version 316 Stainless Steel case is available for offshore/corrosive environments.

The optional explosion-proof case is rated for use in Class I, Div. 1, Groups B, C, & D areas.

SCALES

All indicating scales can be graduated uniformly for measurement of differential pressure or liquid level, or square root for direct reading of flowrate. Special scales can be furnished for indicating liquid level in horizontal or non-uniform tanks. Scales are available in black with white lettering (standard) and in white with black lettering (optional, as shown).

M199 DPU ACTUATED UNITS

Model 289A / 289AS / 289A NACE

A 6-in. (152 mm) indicating switch that features a NEMA-4 case, operating pressure ratings up to 6,000 PSI (414 bar) and a differential pressure range from 0- 10-in. w.c. to 0-100 PSID (0-25 mbar to 0-6.9 bar).

Model 291B/291B NACE

An explosionproof version of the M289A, it is housed in a CSA certified case rated for Class I, Div. 1, Groups B, C, & D areas.

SPECIFICATIONS

M199 DPU Housings (Material/SWP)

Forged Steel: 2500, 4500, & 6,000 PSI (172, 310, & 414 bar)

316 SST: 1,000 & 3,000 PSI (69 & 207 bar)

Bellows Material: 316 SST & Inconel

DP Ranges: 0-10-in. w.c. to 0-100 PSID (0-25 mbar to 0-6.9 bar)

Switch (Indication Accuracy)

                SPDT:    0-10-in. w.c. to 0-349-in. w.c.            ± 1.0% F.S. (0-25 mbar to 0- 867 mbar ± 1.0% F.S.)

                                0-350-in. w.c. to 0-100 PSID             ± 1.25% F.S. (0-869 mbar to 0-6.9 bar ± 1.25% F.S.)

                DPDT:    Add 1% to SPDT values

Point of Actuation Accuracy:                                             Add 1/2% to SPDT values

Repeatability:                                                                       0.25%

Switch Deadband:                                                               SPDT: ± 5.0% max. F.S. DP

                                                                                                DPDT: ± 6.0% max. F.S. DP

Temperature Limits:                                                           -40°F (-40°C) to +180°F (+82°C)

ORDERING INFORMATION

When ordering, specify the following items:

·         Quantity

·         Model number

·         Housing pressure rating (SWP)

·         Housing material

·         Bellows material

·         Material contacting bellows

·         Differential pressure range

·         Number of switches (3 max.)

·         Switch type (SPDT or DPDT)

·         Switch detpoints (5-95%)

·         Optional relays (1 or 2)

·         Type of scale (uniform, square root)

·         Color of scale and scale lettering

·         Scale graduations

ACTUATING UNITS

The indicator is actuated by a rupture-proof bellows DPU with integral temperature compensation. The M199 DPU features dual, liquid-filled bellows designed to withstand repeated over-ranges equal to the safe working pressure of the housings without a change in calibration.

INDICATING MECHANISM

The indicating pointer traverses a 270-degree arc, providing excellent readability. It is driven by a precision-jeweled rotary movement that multiplies rotation of the torque tube through a gear and pinion to the pointer. The movement employs a thermally stable Ni-Span-C hair spring.

The movement has a micrometer screw for convenient range adjustments. Zero/range adjustments can be made without removing the scale plate or pointer. Linearity adjustments are readily accessible after removal of the scale plate.

CASES

BARTON indicators are available in 6” (152 mm) dial size. The standard case is die-cast aluminum with a special baked epoxy black finish, which is NEMA-4/IP65 rated. An optional “S” version 316 stainless steel case is available for offshore/corrosive environments.

SCALES

All indicating scales can be graduated uniformly for measurement of differential pressure, liquid level or square root for direct reading of flow rate. Special scales can be furnished for indicating liquid level in horizontal or non-uniform tanks. Scales are available in black with white lettering (standard) and in white with black lettering (optional, as shown).

M199 DPU ACTUATED UNITS

Model 200A/200AS/200N*

Features a 6” (152 mm) indicator with a built-in adjustable pulsation dampener for direct control of response time.

Note: For NACE applications, M200N uses a M199N DPU.

SPECIFICATIONS

M199 DPU housings (material/SWP)

Forged steel:                                        2500, 4500 and 6000 psi (172, 310 and 414 bar)

316 SST:                                               1000, 3000 and 6000 psi (69, 207 and 414 bar)

Aluminum:                                            1000 psi (69 bar)

Bellows material:                                                 316 SST and Inconel®

Differential pressure ranges:            0 to 10 inches wc to 100 psid (25 mbar to 6.9 bar)

200A/200AS Indicator

Accuracy (differential pressure range):

                10 inches wc to 349 inches wc         ± 0.5% FS (25 mbar to 867 mbar ± 0.5% FS)

                350 inches wc up to 100 psid           ± 0.75% FS (869 mbar to 6.9 bar ± 0.75% FS)

                Repeatability:                                       0.25%

Temperature limits:                             -40° F to 180° F (-40° C to 82° C)

ORDERING INFORMATION

When ordering, specify the following items:

·         Quantity

·         Model number

·         Housing pressure rating (SWP)

·         Housing material

·         Bellows material

·         Material contacting bellows

·         Differential pressure range

·         Type of scale (uniform, square root)

·         Color of scale and lettering

·         Mounting (pipe, wall, flush panel)