HTRHSERIES
Contents
1. G RH AND TEMPERATURE CALCULATIONS 1 Maximum current loop impedance for RH or temperature Rmax V supply 7 volts 02 amps RH current output 1 current output in milliamperes Temperature current output oC 1 4 x 220 16 40 iC oC 40 x 16 220 4 oF 1 4 x 396 16 40 iF oF 40 x 16 396 4 The upper limit of the humidity measurement range decreases based temperature The humidity measurement limit decreases as follows 2 20 per from 95 to 120 C 1 11 per F from 203 to 248 F 1 00 per C from 120 to 140 C 0 56 per F from 248 to 284 F 0 50 per C from 140 to 160 C 0 28 per F from 284 to 320 F 0 25 per C from 160 to 180 C 0 14 per F from 320 to 356 F For example at 120 C the upper humidity limit decreases to about 45 120 95 2 20 55 decrease which is 45 at 180 C it is reduced to about 10 To calculate the RH accuracy we ll use the accuracy specs given in the specifications section 2 RH at 25 C and 40 to 150 C at 0 05 2 To clarify lets take an example RH accuracy at 120 C 2 120 25 0 05 2 4 75 6 75 So the accuracy at 120 C is 6 75 and the upper humidity measurement limit is 45 RH CALIBRATION Refer to Section D for the location of trim pots Note The TEGAM RH CAL Relative Humidity Calibration Kit is recommended for providing the low2. HTRH SERIES High Temperature Relative Humidity Temperature Probe Transmitter Publication Date February 2009 Document Number HTRH 900 01 Rev D NOTE This User s Manual was as current as possible when this product was manufactured However products are constantly being updated and improved To ensure you have the latest documentation refer to www tegam com TABLE OF CONTENTS A GENERAL DESCRIPTION corran 4 CIP AE ocres cmd 4 IHBURT UP OPERATION sonrisa nano 5 D TERMINAL CONNECTIONS AND TRIM POTS 6 5 WIKING spa tri 7 E MAUR art AAA 9 RH AND TEMPERATURE CALCULATIONS 9 BH REUS ALI rca 10 1 TEMPERATURE CALIBRATION rrt nnns 10 1 LAN TENA ri 11 I BEI ILS rn AAA 12 WARRARNI Lyra AAA 13 STATEMENT OF CALIBRA THON comas 13 GENERAL DESCRIPTION The stainless steel probe provides relative humidity as well as temperature out puts thin film polymer capacitor senses relative humidity while temperature is monitored by a 1000 Ohm platinum RTD The sensors are protected by a stainless steel filter cap easily removed for cleaning The probe is connected to an electronics enclosure with a 40 inch 1m Teflon cable The enclosure contains the calibration trimmers signal and power connections via two terminal blocks The probe is available in two configurations as a 2 5 64 mm probe with a wall mounting clip and as an 8 5 216 mm probe with an adjustable duct
3. Time Constant Under 4 seconds 60 response in 1 m sec air Mechanical Standard Probe Stainless steel 2 5 64 mm x 625 16 mm diameter 40 1m Teflon cable metal wall mounting clip Duct Probe Stainless steel 8 5 216 mm x 625 16 mm diameter 40 1m Teflon cable Duct Flange 2 75 70mm dia duct hole 11 16 684 17 5mm dia With 4 mounting holes 156 4mm diameter for 6 sheet metal screws on 2 00 51mm circle Electronics Operating temp 20 C to 70 C 4 F to 158 F ABS housing 4 72 120mm x 3 14 80 mm x 2 16 55 mm H meets NEMA 1 2 3 4 4X 5 12 and 13 specifications Connectors Liquid tight with neoprene gland for 09 to 265 diameter cable 4 pin plug in screw terminal block for output connections 5 pin screw terminal block for cable wire input connections Accepts 14 to 22 AWG wires Weight 2 5 64 mm probe with housing 14 oz 397 grams 8 5 216 mm probe with housing and flange 200z 567 grams 12 WARRANTY TEGAM Inc warrants this product to be free from defects in material and workmanship for a period of one year from date of shipment During the warranty period we will at our option either repair or replace any product that proves to be defective To exercise this warranty write or call TEGAM Inc in Geneva Ohio You will be given prompt assistance and return instructions Send the instrument transportation prepaid to the
4. flange B UNPACKING Verify that the following parts have been received Remove probe with cable and electronics enclosure Instruction manual Wall mounting clip for 2 5 64 mm probe 2 piece duct flange with o ring 3 screws and a gasket for 8 5 216 mm probe 4 to 20 milliamp loop is a series current loop in which a transmitter will vary the current flow depending upon the parameter being measured Relative Humidity or Temperature Advantages of a current output over a voltage output is that is less susceptible to noise interference and allows the connection of more than one meter or recorder to the loop as long as the maximum resistance is not exceeded The typical current loop will consist of a power supply transmitter and a meter to measure the current flow The loop resistance is the sum of the impedance of the meter s and the lead wire The maximum allowable loop impedance of the probe is found by the Formula Rmax power supply voltage 7 volts 02 amps Example when using a 24 VDC power supply Rmax 24 7 02 850 ohms for total wire length to and from the transmitter AWG WIRE SIZE RESISTANCE PER 1000 FEET 24 25 OHMS 22 15 OHMS 20 10 OHMS 18 6 OHMS 16 4 OHMS If the meter or recorder being used accepts only voltage convert the current to voltage by installing a 250 ohm resistor across the input terminals of the recorder to obtain a 1 to
5. indicated service facility Repairs will be made and the instrument returned transportation prepaid Repaired products are warranted for the balance of the original warranty period or at least 90 days LIMITATION OF WARRANTY This warranty does not apply to defects resulting from unauthorized modification or misuse of any product or part This warranty also does not apply to fuses batteries or damage from battery leakage This warranty is in lieu of all other warranties expressed or implied including any implied warranty of merchantability or fitness for a particular use TEGAM Inc shall not be liable for any indirect special or consequential damages STATEMENT OF CALIBRATION This instrument has been inspected and tested in accordance with specifications published by TEGAM Inc The accuracy and calibration of this instrument are traceable to the National Bureau of Standards through equipment which 15 calibrated at planned intervals by comparison to certified standards maintained in the Laboratories of TEGAM Inc 13 10 WAY GENEVA OHIO 44041 PHONE 440 466 6100 FAX 440 466 6110 www tegam com 15
6. 5 volts input D TERMINAL CONNECTIONS AND TRIM POTS PROBE TERMINALS Un 2 YU hn OUTPUT TERMINALS 1 2 3 4 dl rn CABLE WIRE BLACK WHITE GREEN RED SHEILD TYPE RH TEMP TEMP TRIMPOTS TYPE RH GAIN RH ZERO RH OFFSET TEMP GAIN TEMP ZERO IYPE RTD RTD E WIRING EXAMPLES TYPICAL CURRENT HOOKUP Wires and R2 can be combined into one single wire with a jumper at pins 4 and 2 This will result in 3 wires instead of 4 e RH METER OR RECORDER y E TEMP METER OR RECORDER MOUNTING DUCT MOUNTING STEPS 1 2 3 4 Slide flange holder onto probe with countersink hole facing front of probe as shown Position o ring on probe at desired position for depth into duct Slide duct flange onto probe as shown Fasten with 3 6 32 screws and tighten evenly until secure Position gasket between duct flange and duct wall fasten assembly to duct with 4 6 sheet metal screws not included Loosening the 6 32 screws allows for repositioning or removal of the probe without having to remove the duct flange from the wall The duct wall requires a 11 16 684 17 5 mm hole for probe with 4 mounting holes for 6 sheet metal screws evenly spaced on a 2 0 51 mm circle Use duct flange as template B WALL MOUNTING l 2 Fasten metal clip to wall Snap probe into clip
7. and high RH environments for this procedure The salt solutions in this kit are prepared according to ASTM standard 104 85 to provide 11 3 and 75 3 relative humidity environments The containers provided in the kit are designed to fit with these instruments 1 w Turn the span trim pot all the way clockwise Turn the zero trim pot B all the way down counter clockwise Place the sensor in the low 11 396 RH environment Allow at least one hour for stabilization or until the output stops changing Verify the output is 4 02 mA If it is not return the unit to TEGAM for evaluation and repair Adjust the zero trim pot B to the point where it just starts to cause a change in the output Place the sensor in the high 75 396 RH environment Allow at least one hour for stabilization or until the output stops changing Adjust the span trim pot so the output is equivalent to the difference between low and high RH environments Example 75 3 11 3 64 which is equivalent to 14 24 mA Adjust the sensor in the low RH environment and allow at least one hour for stabilization or until the output stops changing Verify the output is equivalent to the low RH environment Example 11 3 is equivalent to 5 81 mA TEMPERATURE CALIBRATION Temperature is factory calibrated only and does not require any further calibrations 10 4 MAINTENANCE If the probe is operated in a dusty environment the prot
8. ective sensor filter if clogged may be removed for cleaning Unscrew filter and gently blow compressed air through screen If necessary use a soft brush to remove lint from sensors If the sensors are subjected to 100 condensation they must be dried to obtain correct readings There is no permanent calibration shift nor is recalibration necessary if 100 condensation occurs The instrument should not be exposed to high Concentrations of ammonia or alcohol vapors However any environment that is breathable under normal HVAC applications should not affect the sensors To maintain original specifications it is generally recommended that the RH sensor be recalibrated on an annual basis depending upon operating conditions The temperature sensor does not require calibration 11 SPECIFICATIONS Relative Humidity Thin film polymer capacitor Input Voltage Range 7 to 30 VDC polarity protected Range Accuracy 3 RH to 95 RH 40 to 95 2 RH at 25 C Typical Temp Characteristics 40 C to 150 C at 05 RH C Output 4 to 20 ma For 096RH to 100 RH Time Constant Under 30 seconds 90 response at 25 C in 1 M sec air See RH and Temperature Calculations section for full range Temperature Thin film 1000 ohm platinum RTD Input Voltage Range 7 to 30 VDC polarity protected Range Accuracy 40 C to 180 C 40 F to 356 0 5 C 1 F Output 4 to 20 ma For 40 C to 180 C 40 F to 356 F
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