PHOTOVOLT CORPORATION

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NEW EQUIPMENT AND MATERIALS (oven cured) or air dried, the clear primer provides good plastisol adhesion to metals. T h e product is transparent a n d colorless a n d can be best used under clear plastisols or for other applications where a colored primer would be objectionable. Dept. IEC, Stanley Chemical Co., East Berlin, Conn.

Spray gun receiver

not in actual use to prevent the paint from hardening. A reservoir tank located well out of the way of the operator keeps a constant liquid level in the receiver. T h e perforated metal fire baffle in the gun port opening prevents ignition of the solvent in the spray gun receiver from exterior sources of ignition. Dept. IEC, Protectoseal Co., 1920 S. Western Ave., Chicago 8, III.

Clear Primer for Plastisols A clear primer for plastisols has recently been developed. Baked

PHOTOVOLT

transmitter is simply a temperaturesensitive resistor and the electrosyn (feedback) is replaced by a precision potentiometer. Norwood Controls, 934 Washington St., Norwood, Mass.

Fire Protection Device Plugs into Wall Socket A simple fire protection device for plant, laboratory, or home use plugs into ordinary wall sockets.

Electro-Mechanical System Records and Controls Process Conditions A variety of process variables can be controlled with this nonelectronic signal generator. T h e system is especially a d a p t a b l e to the natural gas, petroleum, chemical processing, and atomic power industries. I n measuring pressure, differential or flow, the signal transmitter converts the process variable into a shaft rotation of the electrosyn, a rotary differential transformer. O u t p u t from the electrosyn transmitter is a n a.c. voltage exactly proportional to the variable. I n measuring temperature, the signal

Electronic

pH

Fire protection device

METERS

A complete line of pH meters incorporating modern electronic tubes and circuits, simple in operation and maintenance, featuring sealed amplifier plug-in units.

Line-Operated Model 115 • • •

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J

Single range 0-14, scale length 4 " , accuracy 0.05 pH unit. Fully stabilized for w i d e range of line voltage fluctuations. Unprecedented in compactness and low price of only

Write for Bulletin #225

$125.

MODEL 125

Line-Operated Model 110 ifètkâ

• •

Single range 0-14, scale length 7 " , accuracy 0.02 pH unit. Available also w i t h shielded compartment, w i t h base board and carrying hood, w i t h bottles and beakers, additional price $60.—.

Write for Bulletin #105

$195.

Battery-Operated Model 125 MODEL 115

• • • •

Single range 0-14, scale length 5V2", accuracy 0.03 pH unit. Only 3 batteries, standard radio type, 2,000 hours of service. Carrying frame for instrument, beakers, and bottles, price $20.—. Stabilized power supply unit available for alternative operation f r o m 110 v o l t AC line, price S48.—.

Write for Bulletin #118

$155.

Battery-Operated Model 125-Β for Blood pH • •

Scale length 2 % " , expanded five-fold for blood pH tests. Accuracy 0.01 in pH 6-8 range, 0.05 in pH 2-12 range.

Write for Bulletin #122

$175.

MODEL 125-B

See also Bulletin # J 38 on pH Merer Tester Mod. 25 for checking the performance of pH meters without electrodes or buffers, applicable to pH meters of any make. $ 5 8 . -

MODEL 110

PHOTOVOLT

C O R P O R A T I O N 95 MADISON AVENUE. N. Y. 16. Ν. Υ.

For further information, circle number 122 A on Readers' Service Card, page 129 A

122 A

INDUSTRIAL AND ENGINEERING CHEMISTRY