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Objektnummer	B00009424
Seriennummer	009424
Nome oggetto	Metrohm VA 757
Stato	Archiv

Status, terms of delivery and payment

Verification of devices

The second-hand devices are verified by Labexchange Service GmbH before delivery. You are receiving only fully functional devices.

Dispatch time

The stated dispatch times are the shortest possible ones for each article. The effective dispatch times can vary. The effective dispatch times will be stated in the order confirmation.

As a matter of principle, we are offering collective deliveries. The shipping time is calculated based on the position with the longest lead time. A partial delivery is possible on explicit request.

Shipping methods

Parcel services, forwarding agencies, self-pickup, delivery by Labexchange fleet.

Delivery information

Prices exclude shipping costs. Stated shipping costs are to be expected. Deviations are possible. If transport costs are not specified, please ask separately for them.

For deliveries to countries outside the EU, an additional fee of 70,00€ for export is charged. Note for international shipments: A proof of preference/EUR1 will not be issued by us. When self-collecting/ordering EXW from countries within or outside the European Union, 16% VAT will be retained as a deposit until we have received the corresponding confirmation of arrival/bill of delivery from the buyer.

Terms of payment

We do not accept payment by credit card, letter of credit, PayPal, etc. In each case the invoice amount is payable without deduction. Discount is not granted.

Country	Possible payment methods	Comment
DE, AT, CH	Payment by invoice, payment in advance	Payment by invoice is only possible for corporate clients.
NL, BE, LU	Payment by invoice, payment in advance	Payment by invoice is only possible for corporate clients
Other countries	Payment in advance

Our General Terms of Sale, Delivery and Payment are valid and are available for download here.

The goods are offered subject to prior sale.

Definition of status

All articles are used articles, except an article is listed especially as a new device.

Status	Condition	Comment
Immediately available	Used	The article is fully functional and in impeccable condition. It can be shipped immediately.
In stock	Used	The article is on stock. Our service technicians will verify the article before delivery. You are receiving only a fully functional article.
Published	Used	The article is still with the provider. After your order the article will be purchased and verified by us before being shipped to you. A certificate of operativeness as well as a service report are included in delivery.
New device	new	The article is brand new and unused. Regarding new equipment the guarantee/warranty conditions of the corresponding manufacturer apply.

Firma: Metrohm

Modell: VA 757

Kommentar: Dokumente engl.

Brief characterization

PC-controlled system for voltammetry, set chemical workplace with potentiostat and measuring amplifier.

With multi-mode electrode, rotating disk electrode (RDE) as option.

Tilt-back measuring arm, integrated drip pan.

Current measurement techniques

DC Direct Current

NP Normal Pulse

DP Differential Pulse

SQW Square Wave (10 ... 2000 Hz)

AC1 Phase-sensitive Alternating Current 1^st harmonic (1 ... 250 Hz)

AC2 Phase-sensitive Alternating Current 2^nd harmonic (1 ... 250 Hz)

PSA Potentiometric Stripping Analysis (chronopotentiometry)

CV Cyclic Voltammetry (digital ramp)

Potentiostat

Output voltage (AE) ± 12 V

Output current (AE) ± 35 mA

Sweep voltage range ± 5 V

Voltage resolution 150 µV

Input impedance(RE) R ≥ 1 10¹⁰ Ω

Input Bias Current (RE) ± 10 pA

Noise typ. 200 pA

Circuit for measurement of the noise:

100 nF

AE RE ┤├ WE

Measurement mode: Differential Pulse

(method used: DPNoise.mth)

Sweep rate with voltage step 10 mV

CV: 0 ... 37 V/s SQW, DC: 0 ... 20 V/s

DP, NP: 0 ... 0.5 V/s AC1, AC2: 0 ... 0.02 V/s

Pulse amplitudes AC1, AC2: 1 mV ... 1 V

DP, NP: -1 ... 1 V

SQW: 0.15 mV ... 1 V

Current measurement

Current ranges 100 nA ... 10 mA in 6 ranges

Current resolution 0.5 % of the current range

Minimum current I _min 5 pA

Maximum current I _max 35 mA

Integration times 0.1 ... 20 ms

Multi-mode electrode MME (working electrode WE)

Designation 6.1246.020

Electrode types DME (dropping mercury electrode)

HMDE (hanging mercury drop electrode)

SMDE (static mercury drop electrode)

Drop surface 0.15 ... 0.60 mm² (DME and SMDE)

Glass capillary 6.1226.030 (set of 10)

internal diameter = 0.05 mm

Mercury reservoir 6 mL ≅ 81.2 g; sufficient for ca. 200'000 Hg drops

Auxiliary power inert gas (generally nitrogen N₂ ); p = 1 ± 0.2 bar

Rotating disk electrode RDE (working electrode WE, option)

Construction 6.1246.000 Drive shaft + screw-on

6.1204.XXX Electrode tips

Electrode tips 6.1204.100 Ultra trace graphite

6.1204.110 glassy carbon (GC)

6.1204.120 platinum (Pt)

6.1204.130 silver (Ag)

6.1204.140 gold (Au)

Disk diameter 2.0 +0 / -0.05 mm

Radial eccentricity ≤ 0.2 mm

Regeneration with 6.2802.000 Polishing kit

Rotational speed 200, 400, 600,..., 3000 min^-1

Speed constancy ± 2 %

Reference electrode (RE)

Construction double-junction; 6.0728.0X0 Ag/AgCI Ref. system + 6.1245.010 Electrolyte vessel to be filled by user Reference system Ag/AgCI/c(KCI) = 3 mol/L

Diaphragm ceramic diaphragm; diameter = 3 mm

Auxiliary electrode (AE)

Pt auxiliary electrode 6.0343.000 Platinum electrode

GC auxiliary electrode 6.1241.020 Electrode holder +

(option) 6.1247.000 Glassy carbon tip

Stirrer

Construction 6.1246.010 Drive shaft + screw-on

6.1204.090 Stirrer tip

Material PTFE

Rotational speed 200, 400, 600,..., 3000 min^-1

Speed constancy ± 2%

Measuring vessels

6.1415.210 standard measuring vessel made of lead-free borosilicate glass 3.3; working volume = 10 ... 90 mL

6.1415.150 measuring vessel made of lead-free borosilicate glass 3.3 (option); working volume = 5 ... 70 mL

6.1418.220 measuring vessel made of lead-free borosilicate glass 3.3 with thermostat jacket (option)

working volume = 12 ... 70 mL

6.1450.210 measuring vessel made of PFA (option)

working volume = 10 ... 90 mL

Dummy Cell

Use Checking the 757 VA Computrace Stand

Determination of the signal/noise ratio

Connections AE auxiliary electrode

RE reference electrode

WE-L working electrode linear mode (RC element)

WE-D working electrode differential mode (peak/wave)

Inert gas (in general nitrogen N₂ )

Use Operation of MME deaeration of sample solution

Required pressure p = 1 ± 0.2 bar (this gas pressure results in a gas flow rate of ca. 20 L/h)

Connection of Dosimats (Remote interface)

Type 665 Dosimat

Number 1...5

Plug D-Sub with 25 pins

Manual operation Dispensing, filling, adjustment of feed and filling rate

PC add-on board

Designation 3.757.1300 PC Add-on Board

Type Internal TCP/IP network adapter for ISA slot

Plug D-Sub with 37 pins

Mains connection

Voltage 100...240 V

Frequency 50...60 Hz

Power consumption 26 W

Fuse 2 x 1.0 ATH (to be replaced by Metrohm Service only using the same type).

Additional electronic overload protection.

Safety specifications

Construction/testing According to IEC 1010 / EN 61010 / UL 3101-1, protection class 1

Safety directions The Instructions for Use include information and warnings which must be heeded by the user to assure safe operation of the instrument.

Electromagnetic compatibility (EMC)

Emitted interference Standards met:

EN 55011 (class B), EN 55022 (class B),

EN 50081 01.92, NAMUR

Immunity to interference Standards met:

EN 50082-1 01.92, EN61000-3,

IEC801-2 ...IEC801-6

Ambient temperature

Nominal operating range 0... +45 °C

Storage, transport -40...+70 °C

Housing

Material of cover Polyurethane rigid foam (PUR) with fire protection for fire class UL94VO, FCH-free

Material of base Steel, enamelled

Material of measuring head arm Steel, enamelled

Dimensions

Width 259 mm

Height 241 mm (417 mm with cover raised)

Depth 526 mm

Weight 7.8 kg (excl. accessories)

Gruppo prodotti: Polarografi

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